B-Series Temperature Switches

FEATURES Thermowells
B-Series switches have proven reliable Thermowells must be used on any appli-
in such harsh environments as: cation where the stem of the temperature
switch may be exposed to pressure, cor-
• Offshore oil rigs rosive fluids or high velocity. Additionally,
• Chemical and petrochemical plants the use of a thermowell permits instrument
• Pulp and paper mills interchange or calibration check without
disturbing or closing down the process.
• Steel mills Ashcroft temperature switches have
• Power plants bulb diameters to match 3⁄8˝ nominal bore
• Water and sewage-treatment plants thermowells. The bulbs have a sensitive
portion length of 2˝ which can be used
• Other corrosive environments
with 21⁄2˝ “U” dimensioned thermowells or
longer. For maximum accuracy, a thermo-
Ashcroft Inc. supplies highly reliable well’s “U” dimension should be selected
Ashcroft® switches and controls for indus- to permit complete immersion of the sen-
trial and process applications. We begin sitive portion plus 1˝ when measuring the
with rock-solid designs, matching the temperature of liquids; an extra 3˝ should
most appropriate technology with the be allowed when measuring the tempera-
safety and reliability requirements of ture of gases.
the applications. The materials of Thermowell bushings should be used with
construction are specified to remote mount temperature switches. We
Ashcroft’s exacting standards, and recommend the standard 3˝ bulb and code
product is built to last in the toughest 69 Series bushings for use with any ther-
applications. Our modern, responsive mowell “U” dimension. A split rubber grom-
manufacturing facility is supported by an met allows easy installation and “S” dimen-
extensive network of stocking distributors sion adjustment.
and factory sales offices located in virtual-
ly every part of the world. Special applica-
tion assistance is always just a telephone
call away.
The Ashcroft B-Series switch line is
designed to satisfy most switch
requirements. Materials of construc-
tion have been selected for long life.
A wide variety of precision switch ele-
ments are available to meet every
application requirement, including her-
metically sealed contacts for added relia-
bility and safety. The actuators we use
have been proven in more than 20 years
of service in the world’s plants and mills.
Special designs are available for fire safe-
ty, NACE, limit control and other more
stringent requirements. Simplicity and
ease of use are stressed to improve relia-
bility of the installation.
Applications include: pumps, compres-
sors, washers, filters, degreasers, evap-
orators, recovery systems, food process-
ing, ground support equipment, reverse
osmosis systems, heat exchangers,
hydraulic systems, lubrication systems,
marine equipment, textile machinery,
heating and air conditioning equipment.

All specifications are subject to change without notice. Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USA

BULLETIN SW10-T
All sales subject to standard terms and conditions. Tel: 203-378-8281 • Fax: 203-385-0408
© Ashcroft Inc. 2014 10/14 email: info@ashcroft.com • www.ashcroft.com
 B-Series Temperature Switches

Temperature Switches ship that exists between temperature and span setpoint repeatability with very high
B-Series temperature switches feature pressure according to the vapor pressure overtemperature ratings.
a SAMA Class II vapor pressure thermal laws. A wide selection of sensing bulb These standard designs perform well
system. This system provides quick, and armored capillary lengths is avail- in applications where shock and vibra-
accurate response to process tempera- able. The vapor pressure system design tion could be a problem and should be
ture changes with negligible ambient features small bulb sizes, making instal- used with Ashcroft thermowells for bulb
temperature effects. This is inherent in lation easy and cost-effective. protection and ease of installation and
the design due to the precise relation- All models feature ±1.0% percent of maintenance.

STANDARD TEMPERATURE RANGE SELECTION

Maximum
Nominal Range(1),(5) Approximate Deadband(1) Switch Element(4)
Temperature
°F °C °F 20, 26, 27 21, 24, 31 50 22 32, 42
–40 to 60 –40 to 160 400 1.0-2.0 3.0-8.0 1.5-5.5 1.4-6.0 8.0-16.0
0 to 100 –20 to 400 400 1.5-3.0 5.0-12.0 2.2-8.5 1.5-7.5 9.0-20.0
75 to 205 20 to 95 400 1.5-3.5 8.0-16.0 2.5-12.0 2.0-9.0 10.0-24.0
150 to 260 65 to 125 400 1.5-3.0 5.0-12.0 2.2-8.5 2.0-9.0 10.0-24.0
235 to 375 110 to 190 500 1.5-3.5 5.0-12.0 2.5-8.5 2.0-9.0 10.0-24.0
350 to 525(3) 175 to 275 700 2.0-4.5 8.0-16.0 3.2-12.0 2.5-10.0 15.0-34.0
500 to 750(2) 260 to 400 900 4.0-8.0 16.0-30.0 7.2-24.0 5.0-23.0 30.0-50.0
NOTES: 1 All deadbands given in °F. 4 Dual switch element multiply single switch element value by 1.6 for
2 Available with remote mount thermal systems only. approximate deadband.
3 Not available with 23⁄4˝ stem. 5 Set and reset points must fall within the adjustable range.

BULLETIN SW10-T
 B-Series Temperature Switches

B-SERIES TEMPERATURE SWITCH MODEL NUMBER:

To specify the exact switch desired, select entries from appropriate tables as shown in example below.
1 2 3 4 5 6

T 4 2 0 T 0 5 030 X N H 150° to 260°F

1 – ENCLOSURE 3 – THERMAL SYSTEM SELECTION
Temperature switch, Type 400, watertight enclosure Direct Mount
T4
meets NEMA 3, 4, 4X, 13 and IP66 requirements. Order Code System Material Style
Temperature switch, Type 700, explosion-proof TS 3l6 SS Rigid
T7 enclosure meets Div. 1 & 2, NEMA 7, 9 and IP66 Remote Mount
requirements. Order Code System Material Line Length Style(9)
T05 316 SS 5´ Capillary
2 – SWITCH ELEMENT SELECTION T10 316 SS 10´ with
Order Switch Elements T15 316 SS 15´ 302 SS
Code UL/CSA Listed SPDT T20 316 SS 20´ Spring
20(7) Narrow deadband ac 15A, 125/250 Vac T25 316 SS 25´ Armor
21 Ammonia service 5A, 125/250 Vac
22(6) Hermetically sealed switch, 5A, 125/250 Vac 4 – BULB LENGTH SELECTION
narrow deadband Direct Mount
23 Heavy duty ac 22A, 125/250 Vac Minimum
24(1) General purpose 15A, 125/250/480 Vac Order “S” Thermowell
1
⁄2A, 125 Vdc Code Dimension “U” Dimension
1
⁄4A, 250 Vdc; 6A, 30 Vdc 027(8) 23⁄4˝ –
25 Heavy duty dc 10A, 125 Vac or dc, 040 4˝ 21⁄2˝
1
⁄8 HP, 125 Vac or dc 060 6˝ 41⁄2˝
26(7) Sealed environment proof 15A, 125/250 Vac 090 9˝ 71⁄2˝
27 High temperature 300°F 15A, 125/250 Vac 120 12˝ 101⁄2˝
28(5) Manual reset trip on 15A, 125/250 Vac Remote Mount
increasing 030(9) 3˝ 21⁄2˝
29(5) Manual reset trip on 15A, 125/250 Vac
decreasing 5 – OPTIONS
31 Low level (gold) contacts 1A, 125 Vac
32 Hermetically sealed switch, 11A, 125/250 Vac Use table on page 7
general purpose 5A, 30 Vdc
42 Hermetically sealed gold 1A, 125 Vac
contacts 6 – STANDARD TEMPERATURE
50 Variable deadband 15A, 125/250 Vac
RANGE SELECTION
Adjustable Range
UL/CSA Listed Dual (2 SPDT)
°F °C
61(7) Dual narrow deadband 15A, 125/250 Vac
–40 to 600 –40 to 160
62(7) Dual sealed environment 15A, 125/250 Vac
proof 0 to 100 –20 to 400
63 Dual high temp. 300°F 15A, 125/250 Vac 75 to 205 20 to 95
64 Dual general purpose 15A, 125/250/480 Vac 150 to 260 65 to 125
1
⁄2A, 125 Vdc 235 to 375 110 to 190
1
⁄4A, 250 Vdc 350 to 525 175 to 275
65 Dual ammonia service 5A, 125/250 Vac 500 to 750(2) 260 to 400
67(4,6) Dual hermetically sealed 5A, 125/250 Vac NOTES:
switch, narrow deadband 1 Standard switch.

68(4) Dual hermetically sealed 11A, 125/250 Vac

2 Available with remote mount thermal systems only.
3 Dual switches are 2 SPDT snap-action switches, not independently
switch, general purpose 5A, 30 Vdc adjustable.
4 Wires cannot be terminated inside T400 switch enclosure.
70 Dual low level gold contacts 1A, 125 Vac 5 Not available with Type 700 enclosure.
6 Estimated dc rating, 2.5A, 28 Vdc (not UL listed).
71(4) Dual hermetically sealed 1A, 125 Vac 7 Estimated dc rating, 0.4A, 120 Vdc (not UL listed).
switch, gold contacts 8 Not available on 350 to 525°F.
9 Consult factory on remote mount for bulb lengths other than 3.̋

BULLETIN SW10-T
B-Series Switches – Temperature
OPTIONAL FEATURES AND ACCESSORIES NOTES:

B-SERIES SWITCH OPTIONS

1 Standard on 400 Series.
2 700 Series only.

Appicable Switch Series

3 Advise static or working pressure for differential pressure switches.
4 Standard on 700 Series. N/A with DPDT element on 400 Series.

Temperature
5 Terminal Blocks standard with 700 dual switches.
6 N/A on 700 Series.

Code Description All Ranges Notes

XBX ⁄2˝ Male NPT Bushing •
II 2GD

1
Ex d IIC T6 Gb

XCH Chained Cover •

Ex t IIIC T85° C Db IP 6X
(Ta = –20°C to +60°C)

XC8 CSA Approval • 1

XCN ATEX Directive 94/9/EC • 2
XFP Fungus Proofing •
XFS Factory Adjusted Setpoint • 3
XJK Left Conduit Connection • 4
XJL 3⁄4˝ to 1⁄2˝ Reducing Bushing •
XJM Metric Electrical Conduit Connection
M20 x 1.5 •
XK3 Terminal Block (700 Series only) • 5
XLE 6 foot Leads on the Micro Switch •
XNH Tagging Stainless Steel •
XNN Paper Tag •
XPK Pilot Light(s) Top Mounted • 6
XPM 3⁄4˝ Sealed Conduit Connection
with 16˝ Lead Wires •
XTM 2˝ Pipe Mounting Bracket •
XUX IECEx Rating (700 Series only) •

BULLETIN SW10-T
 B-Series Temperature Switches

Dimensions – 400 Series

Temperature switch – direct mount Temperature switch – remote mount

2.27 2.27
Ø 0.28 (7) X 3 HOLES (58) (58)
0.22 4.03 (102) 1.25 Ø 0.28 (7) X 3 HOLES
(6) (32) 1.25
0.22 (6) 4.03 (102) (32)
0.25
(6) 0.25
(6)

3.32
(84) 2.77 3.32
(84) 2.77
(70) (70)
4.61
(117) 4.61
(117)
2.00 2.00
(51) (51)
3/4 NPT
3/4 NPT

7/8 HEX
Ø2.31 (59) 1/2 NPT MALE 2.50
2.31 (64)
“L”
“S” (59)
1.31 Ø2.31 (59)
3.26 (83) (33) ACTIVE BULB
LENGTH

2.31 3.26 (83) Ø 0.37 3.00

(59) Ø 0.37 (9) (76)
ACTIVE BULB (9)
LENGTH

Temperature switch – direct mount Temperature switch – remote mount

Ø 0.28 x 3 HOLES 5.20 3.58 3.58
(7) (132) (91) (91)
2.18
(55) 1.22 5.20
(31) 0.03
(1) (132) 1.22 (31)
0.32
(8) 0.03
(1)
Ø 0.28 x 3 HOLES 2.18
(7) (55)
3.60 (91)
0.32
5.23 Ø 3.90 (8)
(133) (99)
0.31
(8)
3.61 Ø 3.90
1.37 (92) (99)
(35)
5.23
3/4 NPT 2 HOLES (133) 0.31 (8)

1.93 7/8 HEX

(49) 1/2 NPT MALE 1.37
1.31 (35)
2.31 (33) “S”
(59)
3/4 NPT 2 HOLES
1.93 2.50
(64) “L”
2.31 (49)
4.37 (59) 0.37 3.00
(111) (9) 2.31 (76)
ACTIVE BULB 2.31
LENGTH (59) (59)
ACTIVE BULB
LENGTH Ø 0.37
4.37 (9)
(111)

BULLETIN SW10-T
 All specifications are subject to change without notice. Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USA

BULLETIN SW10-T
All sales subject to standard terms and conditions. Tel: 203-378-8281 • Fax: 203-385-0408
© Ashcroft Inc. 2014 10/14 email: info@ashcroft.com • www.ashcroft.com