CN2769861Y - Magnetostrictive liquid level gauge - Google Patents
Magnetostrictive liquid level gauge Download PDFInfo
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- CN2769861Y CN2769861Y CN 200420096041 CN200420096041U CN2769861Y CN 2769861 Y CN2769861 Y CN 2769861Y CN 200420096041 CN200420096041 CN 200420096041 CN 200420096041 U CN200420096041 U CN 200420096041U CN 2769861 Y CN2769861 Y CN 2769861Y
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Abstract
The utility model relates to a magnetostrictive liquid level gauge which is designed by means of the magnetostrictive effect and is applied to measure contact type liquid level. The utility model is composed of a meter calculation display unit, a liquid level detecting and sensing unit, a signal amplifying unit, a measuring rod component with a double-layer sleeve pipe, a mobile installing joint assembly and a floating ball assembly. A circuit part is mainly composed of a control circuit, a detection circuit and an output circuit. The utility model has the advantages that the reasonable design, simple structure, high safely and explosion protection. Besides, measured data of liquid level, temperature, interface, etc. can be displayed at site, the percentage of the liquid level and the measuring range can also be displayed at site, the working conditions and parameters of the meter can be arranged, the installation and the maintenance at site are convenient, the utility model and a display meter or a computer can be formed into a liquid level safety monitoring system, management software can be utilized to realize the functions of detection of the liquid level, the interface and the temperature, density correction, upper and lower limit alarm, volume calculation, graphic display, print of statistical forms, etc.
Description
Technical field
The utility model relates to a kind of magnetostrictive liquid level apparatus that is applied to the contact level gauging that utilizes the magnetostrictive effect principle design.
Background technology
The present major part of Level Detection in the domestic oil product storing and transporting system is also by hand gauging, record, and on-the-spot the demonstration also used magnetic turnover panel or balance indicating device, its pointing accuracy and reliability inequality, non-output signals more.Used wider level gauge of steel band technology in the past and fall behind, aspects such as accuracy of detection, reliability, function all can not satisfy at present fully to Level Detection and tank field automatic management demand, and its installation and maintenance technical sophistication.The magnetostrictive liquid level apparatus of Chu Xianing is the alternative upgrading products of Level Detection of hi-tech in recent years, has caused extensive concern.It is based on the up-to-date principle of magnetostrictive effect, and utilize microelectronics and mechanics of communication, having accomplished that high precision, multiparameter, high reliability and low cost, installation and maintenance are simple and convenient, is the contact level gauging technology and the wideest product of application surface that precision is the highest, stability is best of generally acknowledging at present.The like product of American MTS and V-R company had begun to enter Chinese market in recent years, but because of there not being localization, existence costs an arm and a leg, and delivery cycle is long, and service and parts support such as do not catch up with at problem.Domestic have a few family units also to manufacture experimently, but also do not reach the matured product of corresponding level at present, and it is used seldom.
The utility model content:
The purpose of this utility model is to use the magnetostrictive effect principle design to go out a kind of magnetostrictive liquid level apparatus that is used for the contact level gauging, 1), on-the-spot do not show inconvenient patrol record, monitoring and operation to solve the following problem that similar instrument runs in application:; 2), physical construction is integrated, is not easy to installation and maintenance; 3), appliance circuit does not meet the safety anti-explosive standard; 4), Level Detection low precision etc., replace hand gauging, utilize secondary table and upper location supervisory, can carry out the Centralized Monitoring management of tank field liquid level.
Design proposal of the present utility model is: calculate display unit, Level Detection sensing and signal amplification unit, bilayer sleeve sounding rod parts, mobile erection joint assembly, several parts of ball float assembly by gauge outfit and form.
It is the top that is positioned at instrument that gauge outfit is calculated display unit, watchcase is an explosion-proof shell, front panel is a glass cover, the back is a terminal cap, there is the cable interface both sides, be provided with CPU main control board, display circuit board and power supply/output board in the gauge outfit, finish functions such as calculating, storage, data presentation, signal output, power conversion respectively;
Level Detection sensing and signal amplification unit are below gauge outfit is calculated display unit, the Level Detection magnification circuit plate is installed in the sleeve pipe, magnetic test coil, nickel sheet and waveguide filament securing member are housed on it, connect the waveguide filament in the pipe in measuring, comprised relatively amplifying unit circuit of liquid level/temperature signal detection, pulse transmitting-receiving, waveguide filament loop, small-signal;
The bilayer sleeve sounding rod is at interior pipe top liquid level signal testing circuit plate to be housed, and the temperature detection plate is equipped with in the bottom, is installed with waveguide filament in the interior pipe, and outer tube sleeve is installed shift joint assembly and ball float assembly in interior tube outside on it;
Mobile erection joint assembly can be held sounding rod tightly in the optional position by the on-the-spot flange that is threaded on the sounding rod outer tube, regulate liquid level instrument setting height(from bottom);
The ball float assembly is to be enclosed within on the sounding rod by the permanent magnet ring in stainless steel floating ball shell and the shell, can fluctuate with nightside.
Its sensor circuit is excited to reverse sound wave by what the CPU main control board triggered " inquiry " pulse generation, being transverse on the nickel sheet in the coil (JSR, JSL) on being uploaded to check-out console, reverse lattice in sound wave compression and the stretching nickel sheet, produce magnetostrictive back wash effect, the flexible changes of magnetic field that causes produces induced voltage.
Amplifying comparator circuit is that sensor circuit is produced millivolt level induced voltage signal, and the differential high pass amplifying circuit of being made up of high-speed low-power-consumption video amplifier U1, U2, U3 (LM6365) amplifies.
Comparator circuit be with the amplifying circuit amplifying signal by U4 (LM311) high speed voltage comparator with compare computing with reference to the biased electrical place value, when amplitude was higher than with reference to bias potential, high-speed comparator U4 produced and to stop timing burst pulse PSI signal.
The medium temperature measurement of temperature measuring circuit is temperature detecting resistance PT1000 to be installed in the measuring tube cause in the testing circuit by lead; ambient temperature measurement then directly is installed in temperature detecting resistance PT1000 on the testing circuit plate; thermometric platinum resistance RT0 and RT1 are provided the constant current drive of 2.4mA by LM317 voltage stabilizer IR1 and IR2 and R7 and R8; voltage signal on the platinum resistance is entered 2,3 ends of PIC873 by AT0 and AT1 after RC filtering protection, carry out A/D conversion thermometric by the 4V1 reference voltage.
The CPU main control board is finished transmission, the amplification of detection signal, returns the timing of pulse signal, the calculation process that various buttons are provided with, functions such as the conversion of temperature signal.
The PIC16F873 product that UM1 produces for Microchip company, it is band 4KB Flash storer in a kind of, 24 the two-way I/0 interfaces that can independently programme are arranged, the generation of pulse signal and acceptance, to the signal that receives handle, with temperature sensor carry out the control of interface, various buttons, by communication interface and upper machine communication.
Exciting circuit is to hold the driving pulse control signal FKP that regularly sends through UM2C, UM2D, UM2B Sheffer stroke gate single-chip microcomputer PIC-23, drive amplification through triode T1, give capacitor C 13, C14 and the instantaneous leakage current of C12, C18 by high speed triode T2, make waveguide filament measure the loop and produce big current excitation pulse signal, this pulse signal reaches waveguide filament by PUL, PUH end by way of the testing circuit plate and measures the loop.
The trigger circuit of counting circuit are made up of U5 (74HC74) double D trigger and peripheral circuit, the pulse control signal of TFK (PIC-23) divides two-way, one the road to exciting circuit, another road is after the C15 time-delay, with U5 trigger SD, CD holds connection, TFK=0, make U5A-4 (SD) produce set, this moment, U5A-5 began for the rising edge timing, when being back to testing circuit through magnetic striction wire, driving pulse amplifies comparator circuit, amplify comparator circuit output PSI pulse signal, the PSI pulse is as the clock signal terminal (CLK) of d type flip flop U5A and U5B, the value of D=0 delivered to Q and Q is counter holds, make pumping signal TFK set, d type flip flop output terminal Q and Q all reverse, be that U5-5 (Q) is a negative edge, timing stops, when TN5 (UM4D-13) links to each other with the UM5A-5 end of trigger circuit, TN6 is a list/pair float terminal, TN6=SFL (when being connected) with U5A-6, be single float measurement, work as CFW=1, during TN6=SFL, TN6 is invalid, TN6=DFL (when being connected) with U5A-9, be two float measurements, CFW is a list/pair float measurement interface control signal, work as CFW=1, during TN6=DFL, instrument is for measuring the liquid level state, work as CFW=0, during TN6=DFL, instrument is for measuring interfacial state, INT is the timing control signal, and INT=1 picks up counting, INT=0, stop timing, the excitation pulse signal FKP that sends when single-chip microcomputer makes trigger circuit TN5, timing commencing signal INT upset, timing begins, by counter UM3A with count pulse by FD0, FD1, FD2, FD3 is sent to single-chip microcomputer, after magnetic test coil detects return signal, produce the PSI pulse, make TN5 produce upset, stop timing simultaneously, the outage of liquid level and time of return S relation in direct ratio, single-chip microcomputer can be learnt liquid level by counter signals is carried out computing, when measuring the interface, TN5 does not directly control counting, TN6 controls counting, and when the liquid level gauging of first float was finished, PSI made TN5 become 0, this moment is during DFL=TN6=1, pick up counting, the interface of second float produces the PSI signal, during PSI=0, make trigger circuit U5B-9 (TN6=DFL=0) 0, stop timing, promptly record the spacing of two floats, draw the interface through calculation process.
Designing circuitry becomes the RS485 communication interface, 4-20mA output, three kinds of modes of pwm pulse width output, the serial asynchronous communication mode is adopted in PIC single-chip microcomputer RS485 output, the effective liquid level signal and the temperature signal that collect are passed through PIC-17,18,26 ends, TXD with U1 (MAX485), RXD, the SCN end is connected, through CMA, the CMB end sends signal to host computer, in baud rate is 9600 o'clock, transmitting range can reach 1200m, the output of pwm pulse width is transmitted signal through high-speed driving triode T1 by PIC-13,4-20mA output is through the C14 upper integral with the PWM output signal, U2A buffering by LM358, after R4 and the R13 dividing potential drop 1/2, U2B and R9, R10, R11, R12 totally 4 matched 1M resistance and R14 compensating resistance difference amplifies, and floats resistance by the low temperature of R8 and transfers 4-20mA output to.
This magnetostrictive liquid level measuring instrument is reasonable in design, physical construction is simple, cost is low, utilize magnetostriction sensing principle and single-chip microcomputer in conjunction with design, measuring accuracy is reached ± 1mm, can replace hand gauging fully, the collection medium temperature, parameters such as environment temperature, circuit designs according to the safety anti-explosive standard, be applicable to explosion hazard areas such as refuelling station, the on-the-spot liquid level that shows of LCD display gauge head, temperature, measurement data such as interface, and utilize 14 sections bar post trend to show output 4-20mA signal---be the number percent of liquid level and range (or jar is high),, instrument mode and parameter can be set by the gauge outfit operation, the liquid level instrument can be extracted out from on-the-spot mounting sleeve easily, and do not need to dismantle parts such as sleeve pipe and ball float, and be convenient to installation and maintenance, can form the liquid level safety monitoring system with Displaying Meter or computing machine, utilize management software, realize liquid level, the detection of interface and temperature, the density correction, bound is reported to the police, volume calculations, graphic presentation, functions such as statistical report form printing.
Description of drawings
Fig. 1 magnetostrictive liquid level apparatus complete machine structure synoptic diagram:
1. gauge outfit is calculated display unit 2. detections, sensing, signal amplification unit 3. sounding rod parts 4. shift joint parts 5. ball float assemblies
Fig. 2 gauge outfit is calculated the display cell structure synoptic diagram:
6, panel cover 7, power panel 8, terminal cap 9,036 shell body 10, CPU master control borad 11, display board
Protection tube structural representation in Fig. 3 sounding rod:
12, level gauging plate 13, mounting screw 14, inner pipe joint 15, interior pipe 16, temperature survey plate
The outer protection tube structural representation of Fig. 4 sounding rod:
17, outer tube joint 18, outer tube 19, plug
Fig. 5 moves erection joint modular construction synoptic diagram:
20, set nut 21, resilient ring 22, tension ring 23, bump joint
Fig. 6 ball float modular construction synoptic diagram
24, waveguide filament 25, stainless steel floating ball shell 26, permanent magnet ring
Fig. 7 exciting circuit unit line figure
Fig. 8 counting circuit unit line figure
Fig. 9 amplification ratio is than the circuit unit wiring diagram
Figure 10 temperature measuring circuit unit line figure
Figure 11 output circuit unit wiring diagram
Embodiment:
Below with reference to the accompanying drawings in the magnetostrictive liquid level apparatus complete machine structure of 1 expression each several part form and assembly relation, the structure of magnetostrictive liquid level apparatus described in the utility model is carried out brief description:
Gauge outfit is calculated display unit (1) and is seen shown in the accompanying drawing 2 that gauge outfit shell (9) is selected the explosion-proof watchcase of 036 type cast aluminium for use, and front and back are respectively glass cover panel (6) and terminal cap (8), and there is the cable outlet interface both sides.Integrated PIC Single Chip Microcomputer (SCM) system in the gauge outfit is equipped with and comprises CPU main control board (10), display circuit board and power supply/output board (11), finishes functions such as calculating, storage, data presentation, signal output, power conversion respectively.
In the detecting device sleeve pipe below detection, sensing, signal amplification unit (2) gauge outfit Level Detection magnification circuit plate is installed, magnetic test coil (JSR, JSL), nickel sheet, waveguide filament securing member are housed on it, waveguide filament in connect measuring in the pipe, this part has comprised element circuits such as pulse transmitting-receiving, waveguide filament loop, induced signal detect, small-signal relatively amplifies.
Sounding rod parts (3) are made up of the inside and outside sleeve pipe of stainless steel (seeing shown in the accompanying drawing 3,4).Liquid level signal testing circuit plate (12) is equipped with at interior pipe (15) top, and temperature detection plate (16) is equipped with in the bottom, is installed with waveguide filament (24) in the interior pipe.Outer tube (18) is enclosed within interior tube outside, and shift joint (17) and ball float assembly (5) are installed on it.
Shift joint parts (4) are seen shown in the accompanying drawing 5, it is made of set nut (20), resilient ring (21), tension ring (22), bump joint (23), the shift joint parts are the connection flange at the scene, can on the sounding rod outer tube, hold sounding rod tightly in the optional position, thus scalable liquid level instrument setting height(from bottom).
Ball float assembly (5) sees shown in the accompanying drawing 6 that his stainless steel floating ball shell (25) and permanent magnet ring (26) are enclosed within on the sounding rod, fluctuate with liquid level, in the sounding rod bottom anticreep plug (19) are housed.
The circuit part of magnetostrictive liquid level apparatus is mainly control circuit, testing circuit, a few part groups of output circuit.
Control circuit is made up of single-chip microcomputer, driving source circuit, counting circuit;
Exciting circuit is to connect the TFK output terminal by PIC-23 end signal FKP one tunnel after capacitor C 10, and one the tunnel is connected to 9 ends of Sheffer stroke gate UM2C after capacitor C 15, link VCC through resistance R 11 again.11 ends of Sheffer stroke gate UM2D and 10 ends of UM2C join, and after 12,13 ends of UM2D were linked together, the one tunnel through resistance R 13 ground connection, and one the tunnel receives 8 ends of UM2C and 4,5 ends of UM2B through capacitor C 17.6 ends of UM2B Sheffer stroke gate are received the base stage of triode T1 through resistance R 10, the emitter of T1 is received VCC behind diode D1, the T1 collector is linked the base stage of triode T2 after parallel resistor R5 and capacitor C 7, the emitter one tunnel of T2 is through the capacitor C 12 of parallel connection, ground connection behind the C18, one the tunnel through resistance R 14, the R9 feedback takes back the T2 base stage, resistance R 14, the intermediate point one routing capacitance C11 ground connection of R9, one the tunnel receives N10 through resistance R 12 holds, pulse signal PUL one tunnel is connected with the T2 collector, pulse signal PUH is connected with the T2 collector through R6, another road is connected with the 10V power supply through R2, by capacitor C 13, C14 ground connection.(seeing shown in the accompanying drawing 7)
Counting circuit is made up of trigger circuit, counter circuit, and 5 ends of double D trigger U5A terminate to 10 of U5B through capacitor C 8 in the trigger circuit, and receive VCC through resistance R 23.1,14 of trigger U5A terminates to VCC, and 2 ends of U5A are linked back ground connection with 12 ends of U5B, and receives VCC through capacitor C 7.3 ends of U5A are linked after resistance R 21 ground connection with 11 ends of trigger U5B.The direct ground connection of 7 ends of trigger U5A, 4 terminations are gone into the TFK end signal, 6 ends output SFL signal, 5 termination TN5 output terminals.13 terminations of trigger U5B are gone into the TFK end signal, and receive VCC through resistance R 22, its 8 end need not, 9 termination DFL output terminals; 13 terminations of Sheffer stroke gate UM4D are gone into the TN5 end signal in the counter circuit, and its 12 end is linked with 1,2 ends of Sheffer stroke gate UM2A, its 11 9 ends that terminate to Sheffer stroke gate UM4C.1 termination of Sheffer stroke gate UM4A is gone into the TN6 end signal, its 23 ends that terminate to Sheffer stroke gate UM2A, its 3 10 ends that terminate to Sheffer stroke gate UM4C.8 of Sheffer stroke gate UM4C terminates to 4 ends of Sheffer stroke gate UM4B.5 ends of Sheffer stroke gate UM4B are received ground behind the XTR crystal oscillator, its 61 end that terminates to counter UM3A.2 terminations of counter UM3A are gone into the FCR signal, and its 3/4/5/6 end is received the FD0/1/2/3 output terminal respectively.(seeing shown in the accompanying drawing 8)
Testing circuit---form by inductive coil, amplification comparator circuit, temperature circuit etc.
Amplify comparator circuit:
Behind the resistance R1, a termination is gone into the input end 3 of high speed operation amplifier U1, other end ground connection in the inductive coil JSR parallel connection.Behind the resistance R2, a termination is gone into the input end 3 of high speed operation amplifier U2, other end ground connection in the inductive coil JSL parallel connection.The input end 2 of amplifier U1, U2 is received together after resistance R 5, capacitor C 1, and respectively through resistance R 3, R4, receive the 2V5 reference power supply.The input end 2 of amplifier U1 is received output terminal 6 through resistance R 6, and output terminal 6 is linked the input end 3 of amplifier U3 again through resistance R 9 and parallel resistor R11, C3.The input end 2 of amplifier U2 is received output terminal 6 through resistance R 7, and output terminal 6 is linked the input end 2 of amplifier U3 again through resistance R 10 and parallel resistor R12, C4.
The input end 3 of secondary amplifier U3 meets digitally VSS through resistance R 14, and input end 2 is received the 2V5 reference power supply through resistance R 13, and input end 2 is received output terminal 6 through feedback resistance R15, and output terminal 6 is received the input end 3 of comparer U4 through resistance R 18.7 ends of amplifier U1, U2, U3 are all received power supply 8V2, and 4 ends are all received negative supply N5V.
The input end 2 of comparer U4 is received the 2V5 reference power supply through resistance R 17, receive N2V benchmark negative supply through parallel resistor R16, capacitor C 6, its output terminal 1 is received the PSI signal end, meets VCC after 5,6,7,8 ends are linked together, and after capacitor C 5 ground connection, its 4 end ground connection after capacitor C 2.(seeing shown in the accompanying drawing 9)
3 ends of constant current device IR1, the IR2 of temperature measuring circuit are all received the 8V power end, and 1,2 terminations of IR1 are adjusted resistance R 7, and 1,2 terminations of IR2 are adjusted resistance R 8.1 of IR1 terminates to the high-end RH0 of temperature and resistance Pt1000, and 1 of IR2 terminates to the high-end RH1 of temperature and resistance Pt1000, and terminal AT0 one tunnel receives the high-end RH0 of temperature and resistance Pt1000 through resistance R 4, and one the tunnel through capacitor C 8 ground connection, the low side RL0 ground connection of Pt1000.Terminal AT1 one tunnel receives the high-end RH1 of temperature and resistance Pt1000 through resistance R 3, and one the tunnel through capacitor C 9 ground connection.The low side RL1 ground connection of Pt1000.(seeing shown in the accompanying drawing 10)
Output circuit is by the RS485 communication interface, 4-20mA output, pwm pulse output circuit three parts, 1 of RS485 communication interface device U1,4 ends respectively with Communication Control signal end RXD, TXD links to each other, 2,3 terminate to together, and the back links to each other with Communication Control signal end SCN, its output terminal 6 is received the CMA terminal through resistance R 3, its output terminal 7 is received the CMB terminal through resistance R 2, its 5 end ground connection, its 8 termination VCC, receive the base stage of triode T1 through resistance R 5 from the PWI signal of single-chip microcomputer PIC-13 end, the collector of T1 is received pulse width output terminal PWM, and receive VCC, the grounded emitter of TI through resistance R 6.Simultaneously the PWI signal is received the input end 3 of amplifier U2A, and after capacitor C 14 ground connection.After the input end 2 of amplifier U2A is received its output terminal 1, receive the input end 5 of amplifier U2B again through resistance R 4, the R9 of polyphone.Parallel resistor R13, C9 one end ground connection, the other end is received between resistance R 4, the R9.The input end 6 one tunnel of amplifier U2B is ground connection after the resistance R 12, R14 of polyphone, and its output terminal 7 is received through resistance R 10 in another road.The output terminal 7 of amplifier U2B one the tunnel outputs to the IOU terminal after resistance R 8, the one tunnel receives its input end 5 through feedback resistance R11.(seeing shown in the accompanying drawing 11)
Claims (6)
1. a magnetostrictive liquid level apparatus calculates display unit, Level Detection sensing and signal amplification unit, bilayer sleeve sounding rod parts, mobile erection joint assembly, several parts of ball float assembly by gauge outfit and forms, and it is characterized in that:
It is the top that is positioned at instrument that gauge outfit is calculated display unit, and watchcase is explosion-proof, and front panel is a glass cover, and the back is a terminal cap, and there is the cable interface both sides, are provided with CPU main control board, display circuit board and power supply/output board in the gauge outfit;
Level Detection sensing and signal amplification unit are below gauge outfit is calculated display unit, the Level Detection magnification circuit plate is installed in the sleeve pipe, magnetic test coil, nickel sheet and waveguide filament securing member are housed on it, connect the waveguide filament in the pipe in measuring, comprised relatively amplifying unit circuit of liquid level/temperature signal detection, pulse transmitting-receiving, waveguide filament loop, small-signal;
The bilayer sleeve sounding rod is at interior pipe top liquid level signal testing circuit plate to be housed, and the temperature detection plate is equipped with in the bottom, is installed with waveguide filament in the interior pipe, and outer tube sleeve is installed shift joint and ball float assembly in interior tube outside on it;
Mobile erection joint can be held sounding rod tightly in the optional position by the on-the-spot flange that is threaded on the sounding rod outer tube, regulate liquid level instrument setting height(from bottom);
The ball float assembly is to be enclosed within on the sounding rod by the permanent magnet ring in stainless steel floating ball shell and the shell.
2. magnetostrictive liquid level apparatus according to claim 1, it is characterized in that: the exciting circuit of control circuit is that 23 ends by single-chip microcomputer PIC regularly send driving pulse control signal FKP, one the tunnel connects the output terminal TFK of trigger U5B after capacitor C 10, one the tunnel is connected to 9 ends of Sheffer stroke gate UM2C after capacitor C 15, again through resistance R 11,11 ends of Sheffer stroke gate UM2D and 10 ends of Sheffer stroke gate UM2C join, 12 of Sheffer stroke gate UM2D, after 13 ends are linked together, one the tunnel through resistance R 13 ground connection, one the tunnel receives 4 of 8 ends of Sheffer stroke gate UM2C and Sheffer stroke gate UM2B through capacitor C 17,5 ends, 6 ends of Sheffer stroke gate UM2B are received the base stage of triode T1 through resistance R 10, the emitter of T1 is linked power supply VCC end behind diode D1, collector T1 links the base stage of triode T2 after parallel resistor R5 and capacitor C 7, the emitter one tunnel of T2 is through the capacitor C 12 of parallel connection, ground connection behind the C18, one the tunnel through resistance R 14, the R9 feedback takes back the T2 base stage, resistance R 14, the intermediate point one routing capacitance C11 ground connection of R9, one the tunnel receives negative supply N10 through resistance R 12 holds, pulse signal PUL one end is connected with the T2 collector, pulse signal PUH one tunnel is connected with the T2 collector through R6, another road is connected with the 10V power supply through R2, by capacitor C 13, C14 ground connection.
3. magnetostrictive liquid level apparatus according to claim 1, it is characterized in that: the counting circuit of control circuit is by trigger circuit, counter circuit is formed, 5 ends of double D trigger U5A terminate to 10 of trigger U5B through capacitor C 8 in the trigger circuit, and link power supply VCC through resistance R 23 and hold, 1 of trigger U5A, 14 ends are linked power supply VCC end, 2 ends of trigger U5A are linked back ground connection with 12 ends of trigger U5B, and link power supply VCC through capacitor C 7 and hold, 3 ends of trigger U5A are linked with 11 ends of trigger U5B after resistance R 21 ground connection, the direct ground connection of 7 ends of trigger U5A, 4 terminations are gone into the output terminal TFK of trigger U5B, the output of 6 ends is connected with single float control signal SFL, 5 ends are connected with trigger control end TN5,13 terminations of trigger U5B are gone into the output terminal TFK of trigger U5B, and link power supply VCC through resistance R 22 and hold, its 8 end need not, the two float control signal DFL output terminals of 9 terminations, 13 terminations of Sheffer stroke gate UM4D are gone into trigger control end TN5 in the counter circuit, 1 of its 12 end and Sheffer stroke gate UM2A, 2 ends are linked together, its 11 9 ends that terminate to Sheffer stroke gate UM4C, 1 termination of Sheffer stroke gate UM4A is gone into list/couple float control end TN6, its 23 ends that terminate to Sheffer stroke gate UM2A, its 3 10 ends that terminate to Sheffer stroke gate UM4C, 8 of Sheffer stroke gate UM4C terminates to 4 ends of Sheffer stroke gate UM4B, 5 ends of Sheffer stroke gate UM4B are received ground behind crystal oscillator XTR, its 61 end that terminates to counter UM3A, 2 terminations of counter UM3A are gone into the signal FCR input end of single-chip microcomputer PIC, and its 3/4/5/6 end is received the output terminal FD0/1/2/3 of single-chip microcomputer PIC respectively.
4. magnetostrictive liquid level apparatus according to claim 1, it is characterized in that: in the inductive coil JSR parallel connection of Level Detection amplifying circuit behind the resistance R1, one termination is gone into the input end 3 of high speed operation amplifier U1, other end ground connection, in the inductive coil JSL parallel connection behind the resistance R2, one termination is gone into the input end 3 of high speed operation amplifier U2, other end ground connection, operational amplifier U1, the input end 2 of U2 is through resistance R 5, receive together after the capacitor C 1, and respectively through resistance R 3, R4,2V5 is connected with reference power supply, the input end 2 of operational amplifier U1 is received output terminal 6 through resistance R 6, output terminal 6 is again through resistance R 9 and parallel resistor R11, C3 links the input end 3 of operational amplifier U3, the input end 2 of operational amplifier U2 is received output terminal 6 through resistance R 7, output terminal 6 is again through resistance R 10 and parallel resistor R12, C4 links the input end 2 of operational amplifier U3, the input end 3 of two-level operating amplifier U3 is through resistance R 14 ground connection, input end 2 is connected with reference power supply 2V5 through resistance R 13, input end 2 is received output terminal 6 through feedback resistance R15, output terminal 6 is received the input end 3 of comparer U4 through resistance R 18, operational amplifier U1, U2,7 ends of U3 all are connected with power supply 8V2,4 ends are all received negative supply N5V, the input end 2 of comparer U4 is connected with reference power supply 2V5 through resistance R 17, through parallel resistor R16, capacitor C 6 is connected with benchmark negative supply N2V, its output terminal 1 is received timing control signal PSI end, they are 5 years old, 6,7, after linking together, 8 ends connect power supply VCC end, and after capacitor C 5 ground connection, its 4 end ground connection after capacitor C 2.
5. magnetostrictive liquid level apparatus according to claim 1 is characterized in that: 3 ends of constant current device IR1, the IR2 of temperature measuring circuit are all received the 8V power end, and 1,2 terminations of constant current device IR1 are adjusted resistance R 7; 1,2 terminations of IR2 are adjusted resistance R 8; 1 of constant current device IR1 terminates to the high-end RH0 of temperature and resistance Pt1000,1 of constant current device IR2 terminates to the high-end RH1 of temperature and resistance Pt1000, single-chip microcomputer PIC terminal AT0 one tunnel receives the high-end RH0 of temperature and resistance Pt1000 through resistance R 4, one the tunnel through capacitor C 8 ground connection, the low side RL0 ground connection of Pt1000; Single-chip microcomputer PIC terminal AT1 one tunnel receives the high-end RH1 of temperature and resistance Pt1000 through resistance R 3, and one the tunnel through capacitor C 9 ground connection, the low side RL1 ground connection of Pt1000.
6. magnetostrictive liquid level apparatus according to claim 1, it is characterized in that: output circuit is by the RS485 communication interface, 4-20mA output, pulse width output circuit PWM three parts are formed, 1 of RS485 communication interface device U1,4 ends respectively with Communication Control signal RXD, TXD links to each other, 2,3 terminate to together, and the back links to each other with Communication Control signal SCN, its output terminal 6 is connected with terminal plug-in unit CMA through resistance R 3, its output terminal 7 is connected with terminal plug-in unit CMB through resistance R 2, its 5 end ground connection, its 8 end is connected with power supply, receive the base stage of triode T1 through resistance R 5 from the output signal of 13 ends of single-chip microcomputer PIC, the collector of T1 is received pulse width output circuit PWM output terminal, connect power supply VCC end through resistance R 6, the grounded emitter of T1, the output signal PWI of 13 ends of single-chip microcomputer PIC receives the input end 3 of operational amplifier U2A simultaneously, and after capacitor C 14 ground connection, after the input end 2 of operational amplifier U2A is received its output terminal 1, again through the polyphone resistance R 4, R9 receives the input end 5 of operational amplifier U2B, parallel resistor R13, C9 one end ground connection, the other end is received resistance R 4, between the R9, the input end 6 one tunnel of operational amplifier U2B is through the resistance R 12 of polyphone, ground connection behind the R14, its output terminal 7 is received through resistance R 10 in another road, the output terminal 7 of operational amplifier U2B one the tunnel outputs to current output terminal 10U after resistance R 8, the one tunnel receives its input end 5 through feedback resistance R11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420096041 CN2769861Y (en) | 2004-09-29 | 2004-09-29 | Magnetostrictive liquid level gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420096041 CN2769861Y (en) | 2004-09-29 | 2004-09-29 | Magnetostrictive liquid level gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2769861Y true CN2769861Y (en) | 2006-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420096041 Expired - Lifetime CN2769861Y (en) | 2004-09-29 | 2004-09-29 | Magnetostrictive liquid level gauge |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590044A (en) * | 2012-02-26 | 2012-07-18 | 长安大学 | Test system for evaporation from water surface of salt water |
| CN104344808A (en) * | 2013-08-04 | 2015-02-11 | 上海华测创时测控科技有限公司 | Static level gauge applied to liquid levels |
| CN105784062A (en) * | 2016-04-13 | 2016-07-20 | 辽宁科技大学 | Method and device for detecting material level in material bin |
| CN108716941A (en) * | 2018-06-21 | 2018-10-30 | 迈格仪表(成都)有限公司 | A kind of magnetostriction measuring multiple parameters transmitter |
| CN109073583A (en) * | 2016-04-21 | 2018-12-21 | 惠普发展公司，有限责任合伙企业 | It is sensed using the fluid properties of electrode |
| CN113324621A (en) * | 2021-07-08 | 2021-08-31 | 北京锐达仪表有限公司 | Intelligent matching detachable liquid level meter and intelligent matching method thereof |
-
2004
- 2004-09-29 CN CN 200420096041 patent/CN2769861Y/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590044A (en) * | 2012-02-26 | 2012-07-18 | 长安大学 | Test system for evaporation from water surface of salt water |
| CN104344808A (en) * | 2013-08-04 | 2015-02-11 | 上海华测创时测控科技有限公司 | Static level gauge applied to liquid levels |
| CN105784062A (en) * | 2016-04-13 | 2016-07-20 | 辽宁科技大学 | Method and device for detecting material level in material bin |
| CN105784062B (en) * | 2016-04-13 | 2018-11-06 | 辽宁科技大学 | The detection method and device of level height in a kind of material bin |
| CN109073583A (en) * | 2016-04-21 | 2018-12-21 | 惠普发展公司，有限责任合伙企业 | It is sensed using the fluid properties of electrode |
| US11009383B2 (en) | 2016-04-21 | 2021-05-18 | Hewlett-Packard Development Company, L.P. | Fluid property sensing with electrodes |
| CN108716941A (en) * | 2018-06-21 | 2018-10-30 | 迈格仪表(成都)有限公司 | A kind of magnetostriction measuring multiple parameters transmitter |
| CN108716941B (en) * | 2018-06-21 | 2024-02-02 | 迈格仪表(成都)有限公司 | Magnetostrictive multi-parameter measuring transmitter |
| CN113324621A (en) * | 2021-07-08 | 2021-08-31 | 北京锐达仪表有限公司 | Intelligent matching detachable liquid level meter and intelligent matching method thereof |
| CN113324621B (en) * | 2021-07-08 | 2023-09-22 | 北京锐达仪表有限公司 | Intelligent matching detachable liquid level meter |
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Expiration termination date: 20140929 Granted publication date: 20060405 |