3th Edition

Product Catalog HHD Series

Electromagnetic Flow meter

Jiangsu Huahai M&C Technology Co.,Ltd

Http://www.ehuahai.net info@ehuahai.com
 Contents
A Flowmeter and Sensor
1. Functions ··················································· 1
2. Forms & Constitutions ······································· 1
3. Operation Theory and Structure Characteristics ················ 3
4. Main Technical Datas ········································ 4
5. Mounting & Use ············································· 6

B Transducer
6. Basic Circuit of Transducer ································· 11
7. Operation Instructions of Transducer ························ 12
8. Parameters Setting ········································ 22
9. Alarm Information ········································ 30
10. Troubleshooting ········································· 30
11. Transportation ＆ Storage ································ 31
12. Points for Attention in Order ······························ 31
 A Flowmeter and Sensor
1.Functions
1.1 Characteristics of Products
a) Simple structures, reliable, no movable parts and long service life
b) No parts of intercepting fluid, no pressure loss and fluid clogging
c) Nomechanicalinertia,quick response andgoodstability, application in automatic examination, regulation
and controlling
d) Measuring accuracy is uninfluenced by the physical parameters such as style, temperature, viscosity, density
and pressure.
e) Employ PTFE or rubber liner and different combination of electrode materials such as Hastelloy C,
Hastelloy B,316L, Titanium and can meet the needs of different mediums.
f) The transducer exploits 16-bit insertion-type micro-processor with fast calculation and high accuracy.
g) All the digits are quantity disposed, strong capability of resisting disturbance, reliable measurement,
high accuracy,and the flowrate range can extend to 150:1.
h) LCD display with high resolution
i) With double-direction flowrate measurement and double-direction total amount accumulating
function. And there are three calculators inside which can respectively display forward total flow,
reverse total flow and difference value accumulative amount.
j) Output: current frequency outputs in double directions and RS-485 or RS232 digital communicational
signal ouput.
k) Employ SMD fittings and SMT technology with high reliability of circuit.
1.2 Main Applications
Electromagnetic flowmeters are applied to measure the volumetric flow of conductive liquid and
serosity serum in seal pipes. They are applicable for petro chemistry, steel-iron metallurgy, feedwater
and draining, water irrigation, water disposition, controling of the total amount of sewage, electric
power, paper making, pharmaceutical, food, etc.
2.Forms and Constitutions
2.1 Constitutions
Electromagnetic flowmeter is composed of sensor and transducer.
2.2 Forms of Products
The liner and electrodes of electromagnetic flowmeter’s sensor have many types of materials optional.
The transducer and sensor can constitute integral type flowmeters or detachable (remote) type
flowmeters.

Integral Type Detachable Type

-1-
2.3 Figure and Mounting Size
2.3.1 Figure of DN15~DN150 Integral Type and Sensor
Figure Size & Weight sheet 1
Detachable Type Sensor

Reference weight (kg)

Install Connection Box

DN L H
Integral type Sensor
Explosion Proor Integral
Type Install Ecplosion
15 200 220 10 7
20 200 220 12 9
Isolalion Transducer

25 200 230 14 11
32 200 235 15 12
40 200 245 16 13
50 200 250 17 14
65 200 270 25 22
80 200 285 29 26
100 250 300 31 28
125 250 330 35 32
150 300 360 41 38
Flange Size (standard: GB/T 9119) sheet 2
Pressure 1.6 MPa Pressure 4.0 MPa
DN
D d1 d0 n b D d1 d0 n b
15 95 65 14 4 16 95 65 14 4 16
20 105 75 14 4 18 105 75 14 4 18
25 110 85 14 4 18 110 85 14 4 18
40 150 110 18 4 20 150 110 18 4 20
50 165 125 18 4 20 165 125 18 4 20
65 185 145 18 4 20 185 145 18 8 22
80 200 160 18 8 22 200 160 18 8 22
100 220 180 18 8 22 235 190 22 8 26
150 285 240 22 8 24 300 250 26 8 28
2.3.2 Figure of DN200~DN600 Integral Type and Sensor
Detachable Type Sensor

Figure Size & Weight sheet 3

Install Connection Box
52

120

Explosion Proor Integral

85
DN L HØ~ Reference weight (kg)
Type Install Ecplosion
270
Isolalion Transducer
84
200 350 310 45
250 450 358 50
270

300 500 410 60

φ123
350 550 465 145
222

400 600 515 180

450 600 564 215
500 600 614 245
H

n-d0
d1

600 600 722 335

L

Flange Size (standard : GB/T 9119) sheet 4

Pressure 1.6 MPa Pressure 4.0 MPa
DN
D d1 d0 n b D d1 d0 n b
200 340 295 24 12 26 340 295 22 8 34
250 405 355 26 12 28 395 350 22 12 38
300 460 410 28 12 32 445 400 22 12 42
350 520 470 30 16 35 505 460 22 16 46
400 580 525 32 16 38 565 515 26 16 50
450 640 585 40 20 42 615 565 26 20 57
500 715 650 44 20 46 670 620 26 20 57
600 840 770 54 20 52 780 725 30 20 72

-2-
2.3.3 Figure of DN700~DN2600 Sensor
Figure Size (standard:GB/T9119) sheet 5
b

n-d0
Pressure
DN D d1 do n b
(MPa)
d1
700 895 840 30 24 34

D
H

800 1015 950 33 24 36

900 1.0 1115 1050 33 28 38
L 1000 1230 1160 36 28 38
Remarks:①DN700~DN2600have no integral type; 700 860 810 26 24 26
②Figure of DN2700~DN1600Explosion-separation 800 975 920 30 24 26
type sensor is the same as normal instrument 900 1075 1020 30 24 26
Reference Reference 1000 1175 1120 30 28 26
H H 1200 1405 1340 33 32 28
DN L weight DN L weight
Ø~ Ø~
（kg） （kg） 1400 1630 1560 36 36 32
700 700 836 435 1600 1600 1736 1555 1600 1830 1760 36 40 34
800 800 936 545 1800 1800 1960 2085 1800 2045 1970 39 44 36
900 900 1036 655 2000 2000 2160 2610 2000 0.6 2265 2180 42 48 38
1000 1000 1136 810 2200 2200 2364 3210 2200 2475 2390 42 52 42
1200 1200 1336 875 2400 2400 2564 3910 2400 2685 2600 42 56 44
1400 1400 1536 1235 2600 2600 2764 4510 2600 2905 2810 48 60 46
2.3.4 Figure of Detachable Type Transducer
163
3-φ6.
5

277 84 165
12
3-φ
216

234

262

220

200

69

29 34.5 34.5 34.5

Normal Remote Type Transducer Explosion Proof Remote Type Transducer

3.Operation Theory and Structural Characteristics
3.1 Operation Theory
Electromagnetic flowmeter is based on Faraday’s law of eletromagnetic induction. The measuring
pipe is a non-magnetic-conductive alloy short pipe with a inside-liner of insulated materials. Along
the pipeline the two electrodes perforate the pipe and are fixed on the measuring pipe.The head of
the electrodes is basically paralleled with inner surface of the liner. When the coils of the excitation
impulse the excitation from square-wave of two sides, a working magnetic field with magnetic flux
density B generates in the direction vertical with the measuring pipeline. At this time if the flux with
specific electro-conductivity flows through the measuring pipe, the line of magnetic force will induct
electromotive force E. Electromotive force E is in positive proportion to magnetic flux B, the product
of the inside diameter d of measuring pipe and average flow velocity v, electromotive force E( signal of
the flow) is examined by electrodes and sent through cable to transducer. After the transducer magnifies
the signal of flow, the flow rate of flux is displayed, and the pulse and analog current which are used to
control and regulate the flow rate are output.

-3-
 B

E=KBdV
In the equation: E ---- signal voltage of interelectrodes(v) EBdv

B----density of magnetic flux(T)

d---- inner diameter of measuring pipe(m)
V ---- average flow velocity(m/s)

In the equation, d is a constant. Because the excitation current is constant B is also a constant.
We can know from E = KBdV that flow rate of volume Q is in positive proportion to signal voltage
E, that is, signal voltage of flow rate induction E is in linear relation to flow rate of volumn Q. So if
only E is measured flow rate Q can be defined. This is the basic operating principle of electromagnetic
flowmeter.
From E = KBdV we can know that the temperature of the measured flux medium, density, pressure,
electro-conductivity and the liquid-solid proportion of the liquid-solid mixed flux medium will not
affect the result of the measurement. To moving condition if only it accords with the flow of axial
symmetry (such as laminar flow) it will not affect the result of the measurement. So we say that
electromagnetic flowmeter is a genuine flowmeter of volume. On the part of the manufacturer and
users, if only practically demarcate with average water can the flow of volume of any other conductive
flux medium be measured, without any modification. This is a prominent merit of electromagnetic
flowmeter while any other flowmeter doesn’t possess. In the measuring pipe there’s no active and
choking parts, therefore there’s nearly no loss of pressure, and the reliability is very high.
3.2 Structure of Sensor
Electromagnetic flowmeter has compact structure and short connecting size. Its liner and electrode
materials fit for many kinds of liquids and serosity serums. Because it uses square-wave impulse
excitation, the wattage dissipation of the whole machine and zero are stable and have high reliability.
The main constitutions of sensor are measuring pipe, electrode, excitation loop, magnetic yoke and
shell body; remote type flowmeter has additionally single wiring box.
The sensor with rubber and polyurethane liners is intrinsically sinking structure. If the sensor sinks
to submarine or is installed at the place where easy to be flooded by water, after the finish of site
wiring and right definition, the wiring box needs to be blocked up with seal sticky, and should double
seam according to the random use instruction of seal sticky.

4. Main Technical Datas

4.1 Technical Datas of Whole Machine and Sensor

-4-
 Performing
JB/T9248-1999
Standard
Nominal 15,20,25,32,40,50,65,80,100,125,150,200,250,300,350,400,450,500,600,
Diameter 700,800,900,1000,1200,1400,1600,1800,2000,2200,2400,2600
Max flow velosity 15m/s
DN15~DN600 ±0.3% of indicating value (flow velocity≥1m/s); ±3mm/s (flow velocity＜1m/s )
Accuracy
DN700~DN2600 ±0.5% of indicating value (flow velocity≥0.8m/s); ±4mm/s (flow velocity＜0.8m/s
Fluid electro-
≥5μS/cm
conductivity
Nominal 4.0MPa 1.6MPa 1.0MPa 0.6MPa
pressure DN15~DN150 DN15~DN600 DN20~DN1000 DN700~DN2600
Ambient Sensor -40~+80℃
Temperature. Transducer and Integral type -15~50℃
Liner Material F4, polychlorobutadiene rubber, polyurethane, F46, Fs
Integral type 70℃
PTFE / F4 liner 100℃;150℃(need special order)
Max fluid polychlorobutadiene rubber liner 80℃;120℃(need special order)
temp erature polyurethane 80℃
Remote type
F46 100℃;150℃(need special order)
Fs 80℃
Signal electrode and
Stainless steel 00Cr17Ni14Mo, 0Cr18Ni12Mo2Ti, Hastelloy C, Hastelloy B, Titanium, Tantalum,
earthing ele-
Pt/iridium alloy, stainless steel painting tungsten carbide
ctrode material
Electrode scra-
DN300~DN1600
per machinism
Connecting
Carbon steel
flange material
Earthing flange
Stainless steel 1Cr18Ni9Ti
material
Import Protection DN65~DN600 Stainless steel 1Cr18Ni9Ti
flange material DN700~DN1600 Carbon steel
DN15~DN2600 remote type rubber or polyurethane liner sensor IP68
Enclosure Protection
Other sensors and all transducers IP65
Integral type, IP65, magnetic key, DN15~DN600
Explosion-proof md II BT4
Detachable type, IP65, magnetic key, DN15~DN1600
Marker
m II BT4 Remote type, IP65,transducer in safe area, DN15~DN1600
Space length (Remote
Generally the transducer is no more than 100m long from the sensor ; beyond 100m need special order
type)
4.2 Technical Data of Transducer
DC 18~36V
Electric power
AC 85~265V，45~63Hz
Power < 20W ( go with the sensor)
Inside Calculator All positive-going flowrate, negative-going flowrate and difference-value flowrate have total amount calculator
a)Output signal: Double-direction and two-way, complete isolation0~10mA/4~20mA
Current
b)loading resistance: if 0~10mA then 0~1.5KΩ; if 4~20mA then 0~750 KΩ
output
c)Basic error: on the basis of basic error of the above measurement add ±10µA
a)positive-going and negative-going flowrate output; upper limit of output frequencycan be set between 1~5000 Hz
Frequency
b)With photoelectric isolated transistor collecting electrode open-circuit double-direction output
output
c)Outside power not more than 35V, when breaking over,the biggest current of collecting electrode is 250mA
a)Positive-going and negative-going flowrate output; upper limit of output pulse can extend to 5000cp/s
b)Equivalent weight of pulse is 0.0001~1.0m3/cp
Pulse
c)Width of pulse automaticly set to be 20ms or square wave
Output signal output
e)With photoelectric isolated transistor collecting electrode open-circuit double-direction output
(programmabler) f)Outside power not more than 35V, when breaking over,the biggest current of collecting electrode is 250mA
Flow direc- a)can measure positive and negative going fluid flowrate, and can judge the flow direction of fluid
tion indica- b)When displaying positive-going flowrate, output +10V high level
ting output c)When displaying negative-going flowrate, output 0V low level
a)Two-way with photoelectric isolated transistor collecting electrode open-circuit alarm output
Alarm
b)Outside power not more than 35V, when breaking over,the biggest current of collecting electrode is 250mA
output
c)alarm conditions: fluid hollow pipe, excitation disconnection,flowrate beyond limit
Communic-
ational RS-232C, RS-485, MODBUS, communicational interface, with thunder-resistant protection
interface

-5-
 Damping Time Selectable between 0~100s (90%)
Electrical
Analog input, analog output, alarm power and pulse output, AC, earthing insulating voltage not less than 500V
Isolation
Normal Ambient temperature: integral type –10~+60℃
Working
Conditions Relative humidity: 5%~90%

Environmental temperature: 20±2℃

Reference Relative humidity: 45%~85%
Conditions of Power voltage : 220±2%
Test Power frequency : 50Hz±5%
Content of harmonic wave less than 5%

4.3 Measuring Range of Flowrate

The upper-limit flow velocity of flowrate measuring range can be selected between 0.3m/s~15m/
s; lower-limit flow velocity can be 1% of the upper-limit value. Under the reference condition that
repeatability error is ±0.1% of the measuring value the accuracy of flowmeter is shown in the below
sheet.
Vs: set span (m/s)
Nominal diameter Span m/s accuracy
Below 0.3 ±0.25%FS
15~20 0.3~1 ±1.0R
1~15 ±0. 5%R
0.1~0.3 ±0.25%FS
25~600 0.3~1 ±0. 5%R
1~15 ±0. 3%R
Below 0.3 ±0.25%FS
700~2600 0.3~1 ±1.0R
1~5 ±0.5%
%FS : relative span; %R: relative measuring value

5. Mounting and Use

5.1 Requirements to Outside Environment
a. Flowmeters should avoid being installed in the places where the temperature is changeable and high
temperature radiation of equipment exists. If must , it is required to have measures of heat insulation
and ventilation
b. It is better to install the flowmeters indoors. If it must be installed outdoors, attention must be
given to avoid being caught by rain, flooded by ponding and exposed to the sun. It is required to have
measures of moisture-proof and guard against being exposed to the sun.
c. Flowmeters should avoid being installed in the situation that includes corrosive gas. If must, it is
required to have measures of ventilation.
d. In order to make the installation and maintenance convenient, around the flowmeters abundant room
must be guaranteed
e.Strong magnetic fields and sources of vibration must be avoided existing in the places for installing
flowmeters. If the pipe vibrates greatly, there should be support at both sides to fix the pipe.

-6-
5.2 Requirements to Straight Pipe Section
In order to improve the effects of eddy current and malformation of current fields, there are
some certain requirements to the length of front and back straight pipe of flowmeters, otherwise the
measuring accuracy will be affected (power converter can be installed but must avoid being installed
near or after the regulation valve and the half-open valve).
sheet 9
Installation Instruction Standard- pipe Type
Pipe Installation Types
Diagram Front straight pipe L Back straight pipe S
Bent pipe Picture a 10D 5D
Horizontal pipe Picture b 5D 3D
Backward position of valve Picture c 10D 5D
Flaring pipe Picture d 10D 5D
Backward position of mercury Picture e 15D 2D
Shrinkage pipe Picture f 5D 2D
Mixed liquid Picture g 30D 3D
D

D
S≥5D S≥3D S≥10D S≥5D

Picture a Horizontal pipe Length Requirements to Picture b Bent pipe Length Requirements to
front adn back straight pipe part front adn back straight pipe part
D
D

L≥10D S≥5D L≥10D S≥5D

10D 5D 10D 5D
Picture c Flaring pipe Length Requirements to Picture d Backward position of valve Length
front adn back straight pipe part Requirements to front adn back straight pipe part
D

L≥15D S≥5D
L≥5D S≥2D
15D 5D
5D 2D

Picture e Shrinkage pipe Requirements to Picture f Backward position of mercury Length

front adn back straight pipe part Requirements to front adn back straight pipe part
D

S≥30D S≥3D

Picture e Mixed liquid Requirements to

front adn back straight pipe part

5.3 Requirements to Craft Pipe

Flowmeters have some certain requirements to upstream and downstream craftpipe, otherwise the
measuring precision will be affected.
a. Inner diameter of upstream and downstream craft is the same as that of sensor, and it should meet the
needs: 0.98DN≤ D≤1.05DN ( in the equation DN : inner diameter of sensor, D: inner diameter of craft
pipe)
b. Craft pipe and the sensor must be concentric, deviation of the same axis should be no more than
0.05DN

-7-
5.4 Requirements to by-pass Tube
In order to conveniently examine and repair flowmeters, it is better to install by-pass tube for
flowmeters. Additionally, to those heavily polluted flux and flowmeters need to be cleaned while the
flux cannot be stopped, by-pass tube must be installed.

a. Convenience of examination and repair of flowmeters

b. In terms of heavily polluted flux by-pass tube must be installed
c. Fluid cannot be stopped while the flowmeters need to be cleaned
5.5 Installation Requirements of Flowmeters on the Pipeline

On long pipeline control calve and cutting valve need Add spring fitting to mounting pipeling of big caliber
to be installed on the dowmstream of flowmeters flowmeter(above DN200)

In order to prevent vacuum flowmeters should be

installed at the back of the pump

▲
≥5m

To avoid causing error by attached gas in measurement, In order to prevent vacuum when the length of drop pipe exceeds
mounting of flowmeter 5m it is required to install automatic exhaust valve on the
highest of the downstream of flowmeters

Opened fillin or exhaust flowmeter is installed Horizontal pipeline flowmeters are installed on the
in low part district slightly upward district of the pipeling

-8-
 Q/2 Q/2
▲
▲

d1
d2
▲
▲

When upstream and downstresm pipeline of flowmeter is tapered pipe,central cone angle of tapered pipe should be＜15°

5.6 Earthing of Sensors

To ensure the reliable work of the instrument, improve the measuring accuracy and not be disturbed
by outside parasitic electric potential, sensorsr should bear good independent earth line. Earthing
resistance<10Ω.If the pipe connecting sensor is covered with insulating barrier or nonmetallic pipe,
earthing loop should be added at both sides of sensors.
a. Ways of earthing on metal pipe : The internal of metal pipe has no insulating barrier

Sectional Area of
Copper Core 6mm2

Measuring Earthing＜10Ω

Mounting of Sensor in Metallic Pipeling (inner wall has no insulating layer)

b. Ways of earthing on plastic pipe or insulant paint pipe: earthing loop should be added on both
surfaces of sensors to make the moving measured mediums in the pipe connect with ground with zero
electric potential. Otherwise electromagnetic flowmeters cannot work normally.

Measuring Pipe

Detecting Electrode

Earthing Electrode

Remarks:If there's earthing electroed in sensor then no

need foradding earthing ring,Role of earting electrode
Mounting of sensor on plastic pipeline or pipeline with insulating layer or paint is the same sa that of earthing ring.

5.7 Installation of Sensors on Protectional Pipe in Negative Pole

The pipe protecting electrolysis from eroding usually is insulant on both inside and outside. So the
measured medium has no earth electric potential. Therefore the sensors must use earthing loop.
To the pipe bearing the protection of erosion-proof, the sensor and connecting pipe at two sides are
usually insulant. Therefore the medium is not conductional with earth. The following points must be
given attention when the installation is performed.

-9-
a. Earthing loop is installed on the two surfaces of sensors. They must be insulant with flange of craft
pipe and connect the sensor through earth line2. The materials of earthing loop should bear the erosion
of mediums. The standard material that the manufacturer provides is stainless steel.( 1Cr18Ni9Ti ).
b. Flange of craft pipe at two sides of the instrumentation should be connected with the sensor circled
by the copper wire whose cross-sectional area is 4mm2 to make the protectional potential in the
nagative pole isolate with the sensor. Pay attention not to connecting to the sensor.
Flange connects with the blot and must be insulated with the flange of craft pipe. Users themselves
must prepare the liner bushing and cushion ring made of insulant materials.

11 10 9 8 7 6

1.Measuring Earthing＜10Ω
2.Earthing Wire Sectional Ares of Copper Core 6mm2 1 2 3 4 5

3.Earthing Ring 1.Sensor 2.Liner(PTFE or F46) 3.Earting Ring

4.Insulant sealed pad 5.Pipeline 6.Blot
4.At mounting blot should be insulant wiht flange 7.Wahter 8.Insulant bushing 9.Flat Pad
5.Connect conducting wire Sectional Area of Copper Corc＞4mm2 10.Spring Pad 11.Blot

5.8 Transportation of Electromagnetic Flowmeters

Attention at Transportion

5.9 Points for Attention in Terms of the Installation of Flowmeters

a. The installation size must be computed accurately, otherwise easily revealed or unable to install.
b.The flow direction of the flux must keep in accordance with the arrow of flow direction.
c. The axis of electrodes of flowmeters must be approximately horizontal, otherwise the measuring

-10-
accuracy will be affected.
d. The flange at two sides of the sensor must keep parallel otherwise be easily revealed.
e. To avoid forming whirlpool and flowing, the craft pipe, the seal piece and flowmeter must share
the same axis and cannot be staggered.
f. When installing the flowmeter, it is prohibited that the electric welding works near the flange of
the flowmeter. Lest that the liner of the flowmeter be burned.
g. To craft pipes of different natures the corresponding ways of ground connection should be applied.
h. To those mediums with a nature of erosion, it is better to install them vertically and the measured
medium flows from down to up. By doing so can avoid the solid pellets from depositing in the pipe of
the flowmeter, make the erosion of the liner even and prolong the use life.
For those measuring pipes whose caliber is more than 200mm to make the installation convenient,
telescopic heads can be applied.
B Transducer

6. Basic Circuit of Transducer

36 ble
CPU
Preampli

▲
▲
A/D ROM
fler

Exciting
▲ ▲ ▲ ▲

circuit
▲ ▲ EEROM
85~260V
Switching
45~63Hz power Supply LCD
Display
4~20mA or Current Output
0~10mA
▲

Keyboard
1~5000Hz
Frequency or Pulse Output
Pulse Output
OC Gate Status
▲

Status Output Control

RS485 Communicat-
▲

ion Interface

Fig.6 Structure of Transducer Circuit

The transducer can supply excitation current to the coil in the sensor of electromagnetic flowmeter-the
head amplifier amplifies the electromotive force from the sensor and converts it into standard signals
of current or frequency so that the signals can be used for displaying, controlling and processing. See
structure of transducer circuit shown in Fig.6.

-11-
7. Operation Instructions of Transducer
7.1 Keys and Display
7.1.1 Keyboard Definition and LCD Display of Square Meter

Alarm Type
-066.08
SYS 15:47 m3/Hr
Flow Rate
Unit
Time
+0000000415 Flow velovity
Ratio of Emptiness
Percentage
Y/M/D/Hour/Min/Second
Forward＆ Reverse Total Value
Difference of Forward & Reverse Total

Enter:With ALT Key to form Enter and OK

UP.Plus1,Page UP.With Shift to form
Right Move
Down Minusl,Page DownWith Shift to form
left Move
Compound Key

Fig. 7.1.1 Keyboard Definition and LCD Display of Square Meter

7.1.2 Keyboard Definition and LCD Display of Round Meter

-76.570 Flow Rate

Alarm Indicator Lo×1m3/Hr limit Unit

Flow Velocity
000000013.5m3 Ratio of Emptiness
Percentage
Forward＆ Reverse Total Flow
Differential of Forward & Reverse Total
Enter
UP plus 1,Page Up
Down Minus 1,Page Down
Compound Key

Fig. 7.1.2 Keyboard Definition and LCD Display of Round Meter

-12-
Note: When measuring, press “Compound Key + Enter”, appear password of changing status, base on
distinction of secrecy, and change the password as we provide; then press “Compound Key + Enter”
again, enter the status of setting parameter. If you want to return to the running status, press “Enter” for
several seconds.
7.2 Picture of Transducer

7.3 Wiring Diagram

7.3.1 Wiring and Marking of Square Meter Terminal

RS485
TRX＋
INSW TRX－

ICCOM
ICOUT
PUL＋
PUL－

SGND
PCOM
PDIR

SIG2
SIG1
L1
L2

PE POWER
ALCOM
ALM＋

ALM－

EXT＋
EXT－

SGND
INSW

DS1

DS2

PE

Fig.7.3 (a) Wiring Diagram of Square Meter

Marking Implication of Each Square Meter Wiring Terminal as follows:

-13-
 SIG1 Signal l
SGND Signal Ground
SIG2 Signal 2
DS1 Shielded Exciting 1
TO Separate Model Sensor
DS2 Shielded Exciting 2
INSW 12V Pull Power
EXT+ Exciting Current +
EXT- Exciting Current -
VDCIO 24V Pull Power
Analog Current Output
ICOUT Analog Current Output
ICCOM Analog Current Output Vround
PUL+ Flow Frequency (Pulse) Output
PUL- Frequency (Pulse) Output
Flow Direction
PDIR
PCOM Frequency (Pulse) Output Ground
ALM+ Upper Limit Alarm Output
ALM- Low Limit Alarm Output Two Alarm Output
ALCOM Alarm Output Ground

7.3.2 Disposition and Marking of Square Meter Signal Wire

φ2 Terminal Cold-w elded φ2 Terminal Cold-w elded

Metal Screen Metal Screen

φ10 Heat Shrink Tube φ10 Heat Shrink Tube

▲
▲

▲
▲

▲
▲

▲
▲

▲
▲

Red 32 Conductor Shielded Cable Red 32 Conductor Shielded Cable

Green 32 Conductor Shielded Cable Green 32 Conductor Shielded Cable

▲

Cable for Flow Signa Is:RWP2×32/0.2

Fig.7.3 (b) Connection and Labels of Signal Lines in Square Meter

7.3.3 Wiring and Marking of Round Meter Terminal

L2 L1 COM I+ COM P+ AH AL

FUSE T+ G T-

Fig.7.3 (c) Wiring Terminal Figure of Square Meter

-14-
Marking Implication of Round Meter as Follows:
I+ Current Output for Flow Measurement
COM Current Output Ground for Flow Measurement
P+ Frequency(Pulse) Output for Bi-directional Flow
COM Frequency (Pulse) Output Ground
AL Alarm Output for Lower Limit
AH Alarm Output for Upper Limit
COM Alarm Output Ground
FUSE Fuse for Power Supply
T1＋ +Communication Input Signal
T2－ -Communication Input Signal
G RS232 Communication Ground
L1 220V（24V）Power Supply
L2 220V（24V）Power Supply
7.3.4 Disposition and Marking of Round Meter Signal Line

White Cable
Red 12 Conductor Shielded Cable
Black 12 Conductor Shielded Cable
Red 10 Conductor Shielded Cable
Blue 13 Conductor Shielded Cable
Shield Screen

Black Shielded Cable

Fig.7.3 (d) Disposition and Marking of Round Meter Signal Line

Marking of round meter signal line as follows:
Bi-strand white wire (for excitation current): 12 –strand red core wire
12 –strand black core wire
Bi-strand black shielding wire: 10 – strand red core wire connected to “Signals 1”
10 – strand blue core wire connected to “Signals 2”
Shielding wire connected to “Signal Ground”
7.4 Characteristic and Connection of Cable
7.4.1 Signal Line of Flowrate
For remote (detachable) type flowmeter, in case the electro-conductivity of measured fluid is more than
50μS/cm the flowrate signal transporting cable may use shielding signal cable with model PVVP 2*0.2 mm2
The length should be no more than 100m. Signal cables have to be connected to sensors before dispatch.
Connections of signal cables are shown in Fig.7.3 (b) for square meter and Fig.7.3 (d) for round meter.

-15-
 The transducer provided equal potential excitation shielding signal output voltage to decrease the
effect of distributed capacitance transmitted by cable to the measurement of flowrate signal. When the
measured electro-conductivity is less than 50μS/cm of long-distance transmission you can use bi-core
and bi-shielding signal cable with equal potential shielding. For instance, STT3200 exclusive cable or
BTS type tri-shielding signal cable.
7.4.2 Excitation Current Wire
Excitation current wire can use soft two-core insulating rubber cable wire, suggesting Model
RVVP2*0.3mm 2. The length of excitation current wire is the same as that of signal cable. When using
STT3200 exclusive cable the excitation cable and signal cable combined as one whole.
7.4.3 Output and Power Line
All output and power line are prepared by user according to practical conditions. But attention must
be given to meet the needs of loading current.
Attention: when DIP switch next to terminal is set to ON, the side transducer provided 28V power
supply and 10 KΩ up-pulling resistance to isolated OC gate frequency output (PUL+, PUL-), Alarm
Output (ALM+.ALM-), and Status Control（INSW）. Therefore, when using frequency output together
with sensor to test, DIP switch may be set to ON; leading out frequency signal from PUL+ and PCOM
terminals.
Pulse current output and alarm current output external power supply and load. See Fig.7.4 (a). When
using sensitive load, stream-continuous diode as shown in the figure should be added.

Forward Ammeter
IOOCM
IOOUT
VDCIO

Fig.7.4 (a) Current Output Diagram

-16-
 DC Power Supply Integrated Current
- + 123 456

PUT+

PCOM
Fig.7.4 (b) Connection of Electromagnet Counter

Integrated Current
PUT+

PCOM

Fig.7.4 (c) Connection of Electronic Counter

Low Limit Alarm

DC Power Supply
ALCOM

-
ALM+

ALM-

Upper Limit Alarm

Fig.7.4 (d) Connection of Alarm Output

-17-
 inside outside

PUL+

▲
PDIR

▲
ALM
▲

PCOM

ALCOM

Fig.7.4 (e) Connection of OC Gate

7.4.4 Grounding
Earthing terminal PE should be grounding copper wire with diameter not less than 1.6mm2 to connect
with the earth. Earthing resistance from housing of transducer to earth should be less than 10Ω.
7.5 Output of Digital Quantity
Digital output refers to frequency output and pulse output. Frequency output and pulse output use the
same output point on wiring. Therefore, users cannot choose both frequency output and pulse output at
the same time but either of them.
7.5.1 Frequency Output
Frequency output range: 0~5000HZ. Frequency output corresponds with flow percentage,
Measure value
F = Full scale value ·Frequency Range

Upper limit of frequency output is adjustable. User may choose from 0 to 5000 Hz, or a little lower
one, such as 0 to 1000 Hz or 0 to 5000 Hz, etc.
Frequency output mode is generally used for controlling purpose because it affects percentage flow
rate; if for measurement purpose then select pulse output mode.
7.5.2. Pulse Output
Pulse output mode is mainly used for measurement; output one pulse, represents one equivalent flow
rate, such as 1L or 1M3, etc.
Pulse output equivalent are divided into: 0.001L, 0.01L, 0.1L, 1L, 0.001 M3, 0.01 M3, 0.1 M3, 1 M3.
Users should pay attention that flow range of flowmeter matches with pulse equivalent when choosing
pulse equivalent. For volume flow, calculation formula is as follows:
QL = 0.0007854×D 2×V（L/S）or Q M=0.0007854×D 2×V×10 -3（M 3/S）

-18-
 Here: D — Diameter（mm） V — Velocity（m/s）
If flow rate is too large while selected pulse equivalent is too small, it will cause pulse output exceed
upper limit. Therefore, pulse output frequency should be limited under 3000 Hz. If flow rate is too
small while pulse equivalent is too large it will cause the instrument output one pulse in long time.
Additionally, pulse output is different from frequency output; pulse output is when accumulation
is enough for one pulse equivalent then output one pulse, therefore, pulse output is not very even.
Generally, counter instrument instead of frequency instrument should be selected for pulse output
measurement
7.5.3 Connection of Digital Quantity Output
Digital quantity output has three junctions: digital output junction, digital grounding wire junction and
flowrate direction junction. The signs are as follows:
POUT ———— digital output junction
PCOM ———— digital grounding wire junction
PDIR ------- flowrate direction junction
Generally, the fluid flows towards one direction, meanwhile, use only need to use output junction
and grounding wire junction. If user wants to know flow direction of fluid they may use flowrate
direction junction to complete.
POUT is collector open-circuit output, user may refer to the following circuit:
7.5.3.1 Digital Quantity Level Output Connection

PUL

Pin
User
R equipment
+
▲

E
- Voltage input
Com
Inside Pcom

Fig.7.5 (a) Connection of Digital Quantity Electrical Level Output

-19-
7.5.3.2 Digital Quantity Output connecting Photoelectric Coupler (such as PLC etc.)

PUL

▲
+
▲
E
inside - User
equipment
Pcom

Fig.7.5 (b) Digital Quantity Output connecting Photoelectric Coupler

Generally, user photo coupler need about 10mA current. Therefore, E/R=10mA, E=5~24V.
7.5.3.3 Digital Quantity Output Connecting Relay

PUL J

+ D
▲

E
-
inside Pcom

Fig.7.5 (c) Digital Quantity Output Connecting Relay

Generally, the E required by middle relay is about 12V or 24V. D is the stream-continuous diode. At
present, the internal of most middle relay has this diode. If middle relay itself has no diode, user should
connect one from external.
Digital quantity output parameters are as follows:
POUT and PDIR

Parameter Test Condition Min Value Typical Value Max Value Unit

Voltage IC=100 mA 3 24 36 V

Current Vol≤1.4V 0 300 350 mA

IC=100mA
Frequency 0 5000 7500 HZ
Vcc=24V

High Electric Level IC=100mA Vcc Vcc Vcc V

Low Electric Level IC=100mA 0.9 1.0 1.4 V

-20-
7.6.3 Current Output Connection of Transducer

User system

IVIN DC24V

Transducer IOUT Signal input +

R -
COM

Fig.7.6 (a) Two-wire Connection

User system

Power(+24V)

+ +24V

Transducer
IOUT - Signal input

Power-

COM
COMM

Fig.7.6 (b) Three-wire Connection

User system

Power+24V
+
Power-
- 24V
IOUT Signal input
Transducer
R
COMM COM

Fig.7.6 (c) Four-wire Connection

-21-
8. Parameters Setting
After connecting transducer and sensor to fluid pipeline (no matter calibration or use), you should
initially do the following work:
● Tighten well the pipelines before and after the sensor with copper wire
● Make sure the sensor connect well with the earth
● Make sure the fluid in the pipeline static when adjusting instrument zero
● Make sure the oxidation velum of sensor electrode generate steadily (keep the electrode and fluid
contacting continuously for 48 hours).
The instrument has two running status: Automatic measuring status
Parameter setting status
When the instrument is power on it enters into measuring status automatically. Under automatic
measuring status instrument automatically finishes all measuring functions and display corresponding
measuring data. Under parameter setting status, user uses four panel keys to complete instrument
parameter setting.
8.1 Keys Function
a) Keys Function under Automatic Measuring Status
“Down” Key: circularly choose the content displayed on down line of screen
“Up” Key: circularly choose the content displayed on up line of screen
“Compound” Key +”Enter” Key: enter parameter setting status
“Enter” Key: return to automatic measuring status
Under measuring status, by pressing “Compound” Key + “Up” Key or “Compound” Key + “Down”
Key to adjust CONTRAST of LCD indicator.
b) Keys Function under Parameter Setting Status
“Down” Key: decrease 1 from the number where cursor stops
“Up” Key: add 1 to the number where cursor stops
“Compound” Key + “Down” Key: left shift the cursor
“Compound” Key + “Up” Key: right shift the cursor
“Enter” Key: enter/exit submenu
“Enter” Key: under any status, push down for 2 seconds continuously to return to automatic
measuring status.
Note: (1) When using “Compound” key, firstly press “Compound” key, then press “Up” key or “Down”
key together.
(2) Under parameter setting status, if no operation within 3 seconds then the instrument will
automatically return to measuring status.
(3) For flow direction selection of flowrate zero amendment, shift the cursor to “+” or “-“on the
left, switch it with “Up” key or “Down” key to make it reverse to practical flow direction.
8.2 Operation of Parameter Setting Function Key
In order to set or revise instrument parameters, you must change the instrument from measuring status
into parameter setting status. In measuring status, press “Compound” Key + “Enter” Key, instrument
enters functions selection frame “Parameter Setting”, then press “Enter” key to enter password input

-22-
status, “00000” status, input password to enter; press “Compound” Key + “Enter” Key to enter
parameter setting frame.
Total Flow Zero: in measuring status, press “Compound” Key + “Enter” Key to indicate “Parameter
Setting” function, then press “Up” Key to turn to “Total Flow Zero”; input password of total flow
zero, press “Compound” Key + “Enter” Key, when password of total flow zero automatically becomes
“00000”, instrument finishes zero clearing, at this time total flow inside instrument is zero.
The instrument is designed to have six –grade passwords, among which four grades users can set the
password by themselves; the highest two grades are fixed password value. The six grades passwords
are respectively applied to operators of different security classification.
8.3 Parameter Setting Menu
Transducer (converter) has altogether 52 parameters. Users should set parameters according to
specific conditions when using instrument. Parameters of transducer are as follows:

-23-
 Parameters Setting Sheet
Code Parameter Script Setting Mode PW Grades Parameter Range
1 Language Select 2 Chinese/English
2 Com Addres Set count 2 0～99
3 Baud Rate Select 2 600～14400
4 Com Protocol Select 2 Type 1/Type 2
5 Sensor Size Select 2 3～3000
6 Flow Range Set count 2 0～99999
7 Flow Rspns Select 2 0～100
8 Flow Direct Select 2 Forward/ Reverse
9 Flow Zero Set count 2 ±0.000~±9.999
10 Flow Cutoff Set count 2 0～99%
11 Cut Disp Ena Select 2 Enable/Disable
12 Total Unit Select 2 0.001L～m3
13 Segma_N Ena Select 2 Enable/Disable
14 Analog Type Select 2 0～10mA /4～20mA
15 Pulse Type Select 2 Freque / Pulse
16 Pulse Unit Select 2 0.001L～1m3
17 Frequen Max Select 2 1～ 5000 HZ
18 Mtsensor Ena Select 2 Enable/Disable
19 Mtsnsr Trip Set count 2 999.9 %
20 Mtsensor Crc Set count 2 0.0000～3.9999
21 Alm High Ena Select 2 Enable/Disable
22 Alm High Val Set count 2 000.0～ 199.9 %
23 Alm Low Ena Select 2 Enable/Disable
24 Alm Low Val Set count 2 000.0～199.9 %
25 Clr Total Rec Password 3 000000～399999
26 ClrSum Key Set count 4 000000～399999
27 Sensor Code1 User set 5 Finished date Y M
28 Sensor Code2 User set 5 Product Serial No.
29 Sensor Fact Set count 5 0.0000～3.9999
30 Field Type Select 5 Mode 1,2,3,4
31 Flow Factor Set count 5 0.0000～3.9999
32 Mult Factor Set count 5 0.0000～3.9999
33 Analog Zero Set count 5 0.0000～1.9999
34 Analog Range Set count 5 0.0000～3.9999
35 Meter Factor Set count 5 0.0000～3.9999
36 MeterCode 1 Factory set 5 Finished date Y M
37 MeterCode 2 Factory set 5 Product Serial No
38 FwdTotal Lo Correctable 5 00000～99999
39 FwdTotal Hi Correctable 5 00000～39999
40 RevTotal Lo Correctable 5 00000～99999
41 RevTotal Hi Correctable 5 00000～39999
42 Year User correct 5 00～99
43 Month User correct 5 00～99
44 Day User correct 5 00～99
45 Hour User correct 5 00～99
46 Minute User correct 5 00～99
47 Second User correct 5 00～99
48 Pass Word 1 User correct 5 0000～9999
49 Pass Word 2 User correct 5 0000～9999
50 Pass Word 3 User correct 5 0000～9999
51 Pass Word 4 User correct 5 0000～9999
52 Load Preset Factory set 6 Initialized password
Note: Please don’t use code 4 and 13 at drop time; codes 43 to 47 are power-off time recording
functions; the transducer without power-off function doesn’t have this parameter item.

-24-
8.4 Instructions of Instrument Parameters
Instrument parameters determine instrument running status, calculation method, output ways and status.
Correctly select and set instrument parameter can make instrument run at the best status and get higher
measuring display accuracy and measuring output accuracy.
Parameter setting functions of instrument are designed to have six-grade passwords among which 1
to 5 are users’ passwords while the sixth grade is manufacturer’s password. Users may use the 5 th grade
password to reset grades 1 to 4.
No matter which grade password to use, user can check instrument parameters. But if users want to
change instrument parameter they need to use different grade password.
First Grade Password (set by manufacturer as 00521): User may only observe instrument
parameters;
Second Grade Password (set by manufacturer as 03210): User may change instrument parameters
from 1 ~ 24;
Third Grade Password (set by manufacturer as 06108): User may change instrument parameters
from 1 ~ 25;
Fourth Grade Password (set by manufacturer as 07206): User may change instrument from 1 ~ 26;
Fifth Grade Password (fixed value): User may change instrument parameter from 1 ~ 51.
……
Password Grade 5 can be set by skilled users. Grade 4 is mainly used for setting total flow zero; Grades
1~3 can be set by any one chosen by users.
8.4.1 Language
Transducer has two languages----Chinese & English. Users may choose operation by themselves.
8.4.2 Instrument Communication Address
When communicating with multi-machines different communication address can be set.
8.4.3. Instrument Communication Velocity
Baud Rate selection range: 600, 1200, 2400, 4800, 9600, 14400
8.4.4 Instrument Communication Ways
Communication type 1 is 485 communication signal output; type 2 is MODBUS communication signal
output.
8.4.5 Pipe Size
Sensor size from 3 to 3000 mm.
8.4.6 Flow Unit
Select the following flow display unit from parameters: L/s, L/min, L/h, m 3/s, m 3/min, m 3/h, UKG,
USG. Users may select the one generally used.

-25-
8.4.7 Setting of Flow Range
Flow range setting refers to determining upper limit flow value (full span) while lower-limit flow value
automatically set to “0”. So, instrument flow range setting determines instrument flow range, also
determines the corresponding relationship between instrument percentage display, frequency output or
current output and flow:
Percentage Display Value = (Flow Measuring Value /Instrument Flow Range) * 100 %;
Frequency Output Value= (Flow Measuring Value /Instrument Flow Range) * Full Span of
Frequency
Current Output = (Flow Measuring Value /Instrument Flow Range) * FS of Current + Base Point;
Pulse output value is not affected by instrument flow range setting.
Notice: Instrument displays flow rate with 5 effective figures. Flow rate unit is displayed after the last
value. If the selected flow rate unit is improper the microprocessor will show the operator “overflow”
or “underflow” caused by wrong setting. For example, select L/h as flow display unit for 200 mm
diameter; when flow rate at 1 m/s is 113097 L/h, exceeds 5 figures, causing “overflow”, you should
select flow unit m3/s, m3/min and m3/h.
8.4.8 Measuring Filtration Time (Damping Time)
Long measuring filtration time may improve the stability of instrument flow display and output signal,
fit for accumulated pulsating movement flow measuring. Short measuring filtration time has fast
response speed, fit for control in production process. Setting of measuring filtration time uses selection
mode, that is, user selects one filtration time.
8.4.9 Selection of Flow Direction
If users think that flow direction at debugging is different from designed one, users don’t need to
change connection of excitation line or signal line but to set parameter change for flow direction.
8.4.10 Flow Zero Amendment
Measuring pipe of sensor should be filled with fluid and fluid in static status. Flow zero is expressed by
flow velocity, unit mm/s.
Flow rate zero amendment is as follows

FS=

Up line small words display: FS stands for zero measuring value

Down line big words display: amendment value of zero
When FS display not “0”, amend FS = 0.
Note: if change down line amendment value, FS increases, need to change positive sign and negative
sign of down line value to make FS amend to be zero.
-26-
Amendment value of flow zero is a constant value, should be registered into record sheet of sensor and
naming plate. Zero value is a flow velocity value, making mm/s as unit, its sign is in contrary to that of
amendment value.
8.4.11 Small Signal Cutoff (Flow Cutoff)
Setting of small signal cutoff point is expressed by percentage flow of span. When doing small signal
cutoff users may choose to cut off flow rate, flow velocity and percentage display and signal output at
the same time; or choose to only cut off current output signal and frequency (pulse) output signal while
keep flow rate, flow velocity and percentage display.
8.4.12 Total Flow Unit
Indicator of transducer is 9-bit counter, max allowed value is 999999999.
Total flow unit: L, m3, UKG and USG
Total flow equivalent: 0.001L, 0.010L, 0.100L, 1.000L
0.001m3, 0.010m3, 0.100m3, 1.000m3 ；
8.4.13 Reverse Output Permission Function (Segma_N Ena)
If reverse output permission parameter is set at “Enable” status and fluid flows reversely, transducer
outputs pulse and current as per reverse flow rate and reverse total flow accumulates. If reverse output
permission parameter is set at “Disable” and fluid flows reversely then output pulse of transducer is “0”
(4mA or 0 mA), but total flow still accumulates.
8.4.14 Current Output
Users may choose 0 to 10mA or 4 to 20mA current output.
8.4.15 Pulse Output
Frequency output and pulse output for option
Frequency output: frequency output is continuous square wave; frequency value is in corresponding
with flow percentage.
Frequency Output value = (Flow Measuring Value / Instrument Flow Range) * FS of Frequency
Pulse Output: pulse output is rectangular wave pulse string; each pulse expresses one flow equivalent
flows through pipeline; pulse equivalent is selected from “pulse equivalent unit”. Pulse output mode is
mainly used for flow totalization, connected with totalizer.
Frequency output and pulse output are generally in the form of OC door. Therefore, external direct
current power and load should be connected.
8.4.16 Pulse Equivalent Unit
Pulse unit equivalent refers to flow rate represented by one pulse; selection range of instrument pulse
equivalent:

-27-
 Pulse Equivalent Flow Rate Pulse Equivalent Flow Rate

1 0.001L/cp 5 0.001m3/cp

2 0.01L/cp 6 0.01m3/cp

3 0.1L/cp 7 0.1m3/cp

4 1.0L/cp 8 1.0m3/cp

Under the same flow rate, if pulse equivalent is small then frequency of output pulse is high and error
is total flow is small.
8.4.17 Pulse Output Time
Pulse output time can be selected between 4 to 400 ms; in case of high frequency, automatically change
to square wave.
8.4.18 Frequency Output Range
Frequency output range is in corresponding with upper limit of flow measuring, i.e. 100% of percentage
flow; upper limit value of frequency output can be set from 1 to 5000 Hz.
Empty Pipe Alarm Permission (Mtsensor Ena)
Instrument has empty pipe testing function, and no need for extra electrode. If users choose to allow
empty pipe alarm then when fluid in pipeline is lower than measuring electrode, instrument will test an
empty pipe status. After testing this status, analog output and digital output of instrument set to be zero,
meanwhile, instrument flow rate displays zero.
8.4.19 Empty Pipe Alarm Threshold Values (Mtsnsr Trip)
In case the pipeline is filled with fluid (no matter whether there’s flow velocity), revise setting of empty
pipe alarm to make convenient use. Up line of empty pipe alarm threshold value displays practical
conductivity while down line displays set empty pipe alarm threshold value; you may set empty pipe
alarm threshold value according to practical conductivity, 3 to 5 times of that.
8.4.20 Upper Limit Alarm Permission (Alm High Ena)
Users choose “Enable” or “Disable”.
8.4.21 Upper Limit Alarm Value
Upper limit alarm value is calculated by span percentage; this value is in the form of value setting,
users set one value between 0% and 199.9%. In the process of running, if alarm requirements are met,
instrument will output alarm signal.
8.4.22 Lower Limit Alarm
Same as that of upper limit alarm
8.4.23 Excitation Alarm
Select “Enable”, with excitation alarm function; select “Disable”, cancel excitation alarm function.

-28-
8.4.24 Code of Sensor
Sensor code may be used to mark production date and serial no of go-with sensor to help set sensor
factor.
8.4.25 Sensor Factor
Sensor factor: calibration factor of electromagnetic flowmeter. This factor is got by calibration and
printed on naming plate of sensor. Users are required to set this factor in the transducer parameters.
(generally, the factory will set it before dispatch)
8.4.26 Excitation Mode Selection
Transducer provides three excitation frequency for option: 1/10 power frequency (mode 1), 1/16 power
frequency (mode 2), 1/25 power frequency (mode 3). For small diameter sensor excitation system
inductance is small, should select 1/10 power frequency; for big diameter sensor excitation system
inductance is large, users can only select 1/16 power frequency or 1/25 power frequency. In the process
of use, firstly select excitation mode 1, if flow velocity zero is too high then select mode2 or mode3 in
turn.
Note: The flowmeter should work in the same excitation mode as in which the flowmeter is calibrated.
8.4.27 High Level / Low Level of Forward Total Flow
Setting of high or low level total flow can change the value of forward total flow and reverse total
flow; mainly used for instrument maintenance and replacement.
Users use 5-grade password to enter, may revise forward total flow（Σ+）. Generally, the set total flow
cannot exceed the max value (999999999) counted by counter.
8.4.28 Time – Year, Month, Day, Hour, Minute, Second (with clock function)
Users use five-grade passwords to enter, may revise time – year, month, day, hour, minute and second.
8.4.29 Peak Restriction Permission
For serum like paper pulp and slurry, solid particle in the liquid may rub or attack measuring electrode
and cause “Tip Shape Interference”; to overcome this kind of interference, our transducer uses
algorithm of change rate restriction; transducer is designed to have 3 parameters to select change rate
restriction characteristics.
Set this parameter to “Enable” to start change rate restriction algorithm; set this parameter to
“Disable” to close change rate restriction algorithm.
8.4.30 Peak Restriction Factor
This factor selects the change rate to restrict Tip Shape Interference, calculate as per percentage of flow
velocity, divided into 10 grades: 0.010m/s, 0.020m/s, 0030m/s, 0.050m/s, 0.080m/s, 0.100m/s, 0.200m/
s, 0.300m/s, 0.500m/s, 0.800m/s. The smaller the percentage, the higher the sensitivity of Tip Shape
Interference Restriction. Please note, in application, it is not necessary that the higher the sensitivity
the better, but try to choose according to practical conditions.
8.4.31 Peak Restriction Time
This parameter selects the time width to restrict Tip Shape Interference, take millisecond as unit.

-29-
If flow change in lasting time less than that in selected time then transducer thinks it is Tip Shape
Interference; if flow change in lasting time is larger than that in selected time then transducer thinks it
is normal flow change. You may try to select this parameter according to practical conditions.
8.4.32 Users Password 1 to 4
Users use 5-grade password to enter, may revise this password.
8.4.33 Current Zero Amendment
Zero adjustment of current output before leaving factory makes current output accurately to be 0 mA or
4 mA.
8.4.34 Current Full Span Amendment
Full span adjustment of current output before leaving factory makes current output accurately to be
10mA or 20mA.
8.4.35 Factory Calibration Factor
The manufacturer of transducer uses this factor to make measuring circuit system of transducer
normalization to ensure exchangeability among all transducers upto 0.1%.
8.4.36 Instrument Code 1 & 2
Transducer codes record factory date and serial no of transducer.
8.4.37 Password for Total Flow Zero
Users may use third-grade password to set this password, under Total Flow Zero.

9. Alarm Information
Because print circuit board of transducer uses surface welding technology, for users, it is unrepairable.
Therefore, users cannot open the shell of transducer.
The transducer has self-diagnosis function. Except for trouble in power supply and hardware circuit,
it can accurately give alarm information for trouble appeared in general application. These information
indicate “ ” at the left of indicator. Under measuring status, instrument automatically displays trouble
content as follows:
FQH ---- Flowrate Upper Limit Alarm; FQL ---- Flowrate Lower Limit Alarm;
FGP ---- Fluid Empty Pipe Alarm; SYS ---- System Excitation Alarm;
UPPER ALARM ---- Flowrate Upper Limit Alarm LOWER ALARM ---- Flowrate Lower Limit Alarm
LIQUID ALARM ---- Fluid Empty Pipe Alarm SYSTEM ALARM ---- System Excitation Alarm

10. Troubleshooting
10.1 No Display
﹡ Check whether power is on.
﹡ Check whether main fuse is in good condition
﹡ Check whether power supply meets the requirement.

-30-
10.2 Excitation Alarm
﹡ Check whether excitation connection EX1 and EX2 are open circuit
﹡ Check whether total resistance of sensor excitation coil is less than 150 Ω
﹡ If the former two items are normal then transducer has trouble.
10.3 Empty Pipe Alarm
﹡ Check whether sensor measuring pipe is filled with fluid
﹡ Short circuit transducer signal input terminal SIG1, SIG2 and SIGGND with lead wire;
meanwhile, if prompt“Empty Pipe”cancels then it shows transducer is normal; it’s possible that
the conductivity of measured fluid is low or settings of empty pipe threshold value and empty pipe
range are wrong.
﹡ Check whether signal lines are connected correctly
﹡ Check whether electrodes of sensor are correct.
Make flow rate zero, indicated conductance ratio should be less than 100%
When there are flow flowing through, respectively test the resistance of terminal SIG1 and SIG2 to
SIGGND, should be less than 50 kΩ (for measuring value of fluid water, it’s better to measure with
pointer multimeter; charge-discharge phenomenon will be seen in measuring process).
﹡ Test direct current voltage between DS1 & DS2 with multimeter, it should be less than 1V,
otherwise it indicates that sensor electrodes are polluted, and should be cleaned.
10.4 Flow Measurement Not Accurate
﹡ Whether measuring pipe is full of fluid
﹡ Whether signal lines are connected normally
﹡ Check whether sensor factor and sensor zero are set according to naming plate or calibration
certificate.

11. Transportation & Storage

To prevent the instrument from being damaged in running, before reaching mounting site, please
keep the original state. In storage, storage site should be indoor meets the following conditions:
a) Rain proof, damp proof
b) Slight mechanical vibration, avoid impact
c) Temperature range: -20 to 60 ℃
d) Humidity: no more than 80%

12. Points for Attention in Order

Please specify the following items when ordering:
Model, specification and additional codes
Fluid name
Temperature range
Pressure range
Flow range

-31-