Page 1
B-Series Temperature Switches
FEATURES
B-Series switches have proven reliable
in such harsh environments as:
• Offshore oil rigs
• Chemical and petrochemical plants
• Pulp and paper mills
• Steel mills
• Power plants
• Water and sewage-treatment plants
• Other corrosive environments
Ashcroft Inc. supplies highly reliable
®
Ashcroft
switches and controls for indus-
trial and process applications. We begin
with rock-solid designs, matching the
most appropriate technology with the
safety and reliability requirements of
the applications. The materials of
construction are specified to
Ashcroft’s exacting standards, and
product is built to last in the toughest
applications. Our modern, responsive
manufacturing facility is supported by an
extensive network of stocking distributors
and factory sales offices located in virtually every part of the world. Special application assistance is always just a telephone
call away.
The Ashcroft B-Series switch line is
designed to satisfy most switch
requirements. Materials of construction have been selected for long life.
A wide variety of precision switch ele-
ments are available to meet every
application requirement, including hermetically sealed contacts for added reliability 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 safety, NACE, limit control and other more
stringent requirements. Simplicity and
ease of use are stressed to improve reliability of the installation.
Applications include: pumps, compressors, washers, filters, degreasers, evaporators, recovery systems, food processing, ground support equipment, reverse
osmosis systems, heat exchangers,
hydraulic systems, lubrication systems,
marine equipment, textile machinery,
heating and air conditioning equipment.
Thermowells
Thermowells must be used on any appli-
ation where the stem of the temperature
c
switch may be exposed to pressure, corrosive fluids or high velocity. Additionally,
he use of a thermowell permits instrument
t
interchange or calibration check without
disturbing or closing down the process.
Ashcroft temperature switches have
bulb diameters to match
3
⁄8˝ nominal bore
thermowells. The bulbs have a sensitive
portion length of 2˝ which can be used
1
⁄2˝ “U” dimensioned thermowells or
with 2
longer. For maximum accuracy, a thermowell’s “U” dimension should be selected
to permit complete immersion of the sensitive portion plus 1˝ when measuring the
temperature of liquids; an extra 3˝ should
be allowed when measuring the temperature of gases.
Thermowell bushings should be used with
remote mount temperature switches. We
recommend the standard 3˝ bulb and code
69 Series bushings for use with any thermowell “U” dimension. A split rubber grommet allows easy installation and “S” dimension adjustment.
BULLETIN SW10-T
All specification s are s ubject t o change without notice.
All sales subject to standar d terms and con ditions.
© Ashcroft Inc. 2014 1 0/14
Ashcroft Inc., 250 East M ain Stre et, S trat ford, CT 06614 USA
Tel: 203-378- 8281 • Fax: 203-385-0408
email: inf o@ashcrof t.com • www.a shcroft.c om
Page 2
B-Series Temperature Switches
emperature Switches
T
B-Series temperature switches feature
a SAMA Class II vapor pressure thermal
system. This system provides quick,
accurate response to process temperature changes with negligible ambient
temperature effects. This is inherent in
the design due to the precise relation-
STANDARD TEMPERATURE RANGE SELECTION
Maximum
°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
Nominal Range
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
500 to 750
NOTES:
(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
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
1 All deadbands given in °F.
2 Available with remote mount thermal systems only.
3 Not available with 2
1),(5)
(
Temperature
3
⁄4˝ stem.
ship that exists between temperature and
pressure according to the vapor pressure
laws. A wide selection of sensing bulb
and armored capillary lengths is available. The vapor pressure system design
features small bulb sizes, making installation easy and cost-effective.
All models feature ±1.0% percent of
Approximate Deadband
4 Dual switch element multiply single switch element value by 1.6 for
approximate deadband.
5 Set and reset points must fall within the adjustable range.
span setpoint repeatability with very high
overtemperature ratings.
These standard designs perform well
in applications where shock and vibration could be a problem and should be
used with Ashcroft thermowells for bulb
protection and ease of installation and
maintenance.
1)
(
Switch Element
4)
(
BULLETIN SW10-T
Page 3
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 42 3
5
6
T 4 2 0 T 0 5
030
1 – ENCLOSURE
Temperature switch, Type 400, watertight enclosure
T4 meets NEMA 3, 4, 4X, 13 and IP66 requirements.
Temperature switch, Type 700, explosion-proof
T7 enclosure meets Div. 1 & 2, NEMA 7, 9 and IP66
requirements.
2 – SWITCH ELEMENT SELECTION
Order Switch Elements
Code UL/CSA Listed SPDT
(7)
20
21 Ammonia service 5A, 125/250 Vac
22
23 Heavy duty ac 22A, 125/250 Vac
24
25 Heavy duty dc 10A, 125 Vac or dc,
1⁄8 HP, 125 Vac or dc
26
27 High temperature 300°F 15A, 125/250 Vac
28
29
31 Low level (gold) contacts 1A, 125 Vac
32 Hermetically sealed switch, 11A, 125/250 Vac
42 Hermetically sealed gold 1A, 125 Vac
50 Variable deadband 15A, 125/250 Vac
61
62
63 Dual high temp. 300°F 15A, 125/250 Vac
64 Dual general purpose 15A, 125/250/480 Vac
1⁄4A, 250 Vdc
65 Dual ammonia service 5A, 125/250 Vac
67
68
70 Dual low level gold contacts 1A, 125 Vac
71
Narrow deadband ac 15A, 125/250 Vac
(6)
Hermetically sealed switch, 5A, 125/250 Vac
narrow deadband
(1)
General purpose 15A, 125/250/480 Vac
1
⁄2A, 125 Vdc
1⁄4A, 250 Vdc; 6A, 30 Vdc
(7)
Sealed environment proof 15A, 125/250 Vac
(5)
Manual reset trip on 15A, 125/250 Vac
increasing
(5)
Manual reset trip on 15A, 125/250 Vac
decreasing
general purpose 5A, 30 Vdc
contacts
UL/CSA Listed Dual (2 SPDT)
(7)
Dual narrow deadband 15A, 125/250 Vac
(7)
Dual sealed environment 15A, 125/250 Vac
proof
1
⁄2A, 125 Vdc
(4,6)
Dual hermetically sealed 5A, 125/250 Vac
switch, narrow deadband
(4)
Dual hermetically sealed 11A, 125/250 Vac
switch, general purpose 5A, 30 Vdc
(4)
Dual hermetically sealed 1A, 125 Vac
switch, gold contacts
X N H
150° to 260°F
3 – THERMAL SYSTEM SELECTION
Direct Mount
Order Code System Material Style
TS 3l6 SS Rigid
Remote Mount
Order Code System Material Line Length Style
T05 316 SS 5´
T10 316 SS 10´
T15 316 SS 15´ 302 SS
T20 316 SS 20´
T25 316 SS 25´
4 – BULB LENGTH SELECTION
Direct Mount
Minimum
Order “S” Thermowell
Code Dimension “U” Dimension
(8)
027
23⁄4˝ –
040 4˝ 21⁄2˝
060 6˝ 41⁄2˝
090 9˝ 71⁄2˝
120 12˝ 101⁄2˝
Remote Mount
(9)
030
3˝ 21⁄2˝
5 – OPTIONS
Use table on page 7
6 – STANDARD TEMPERATURE
RANGE SELECTION
Adjustable Range
°F °C
–40 to 600 –40 to 160
0 to 100 –20 to 400
75 to 205 20 to 95
150 to 260 65 to 125
235 to 375 110 to 190
350 to 525 175 to 275
500 to 750
NOTES:
1 Standard switch.
2 Available with remote mount thermal systems only.
3 Dual switches are 2 SPDT snap-action switches, not independently
adjustable.
4 Wires cannot be terminated inside T400 switch enclosure.
5 Not available with Type 700 enclosure.
6 Estimated dc rating, 2.5A, 28 Vdc (not UL listed).
7 Estimated dc rating, 0.4A, 120 Vdc (not UL listed).
8 Not available on 350 to 525°F.
9 Consult factory on remote mount for bulb lengths other than 3.˝
(2)
260 to 400
(9)
Capillary
with
Spring
Armor
BULLETIN SW10-T
Page 4
B-Series Switches – Temperature
OPTIONAL FEATURES AND ACCESSORIES
B-SERIES SWITCH OPTIONS
Appicable Switch Series
Temperature
Code Description
XBX 1⁄2˝ Male NPT Bushing •
XCH Chained Cover •
XC8 CSA Approval •
XCN ATEX Directive 94/9/EC •
XFP Fungus Proofing •
XFS Factory Adjusted Setpoint •
XJK Left Conduit Connection •
XJL 3⁄4˝ to 1⁄2˝ Reducing Bushing •
XJM Metric Electrical Conduit Connection
M20 x 1.5 •
XK3 Terminal Block (700 Series only) •
XLE 6 foot Leads on the Micro Switch •
XNH Tagging Stainless Steel •
XNN Paper Tag •
XPK Pilot Light(s) Top Mounted •
XPM 3⁄4˝ Sealed Conduit Connection
with 16˝ Lead Wires •
XTM 2˝ Pipe Mounting Bracket •
XUX IECEx Rating (700 Series only) •
All Ranges Notes
NOTES:
Standard on 400 Series.
1
2 700 Series only.
3 Advise static or working pressure for differential pressure switches.
Standard on 700 Series. N/A with DPDT element on 400 Series.
4
5 Terminal Blocks standard with 700 dual switches.
6 N/A on 700 Series.
II 2GD
Ex d IIC T6 Gb
x t IIIC T85° C Db IP 6X
E
(Ta = –20°C to +60°C)
1
2
3
4
5
6
BULLETIN SW10-T
Page 5
0.22 (6)
3.32
(84)
3.26 (83)
0.28 (7) X 3 HOLES
4.03 (102)
Ø2.31 (59)
4.61
(117)
2.31
ACTIVE BULB
LENGTH
(59)
2.77
(70)
2.27
(
58)
1.25
(32)
0.25
(6)
3.00
(76)
Ø
0.37
(9)
“L”
2
.50
(64)
2.00
(51)
3/4 NPT
Ø
0.22
(6)
3.32
(
84)
3
.26 (83)
Ø 0.28 (7) X 3 HOLES
4.03 (102)
Ø2.31 (59)
4.61
(117)
2.77
(70)
2.27
(58)
1.25
(32)
0.25
(6)
Ø 0.37
(9)
2.00
(51)
1.31
(33)
2.31
ACTIVE BULB
LENGTH
(59)
“S”
3/4 NPT
1/2 NPT MALE
7/8 HEX
Dimensions – 400 Series
5.20
(
132)
3.61
(92)
2.18
(55)
0.32
(8)
4.37
(111)
1.37
(35)
Ø 0.28 x 3 HOLES
(7)
2.31
(59)
5.23
(133)
1.93
(49)
2.31
ACTIVE BULB
LENGTH
(59)
Ø 3.90
(99)
0.03
(1)
3.58
(91)
0.31 (8)
1.22 (31)
2.50
(64)
“L”
3.00
(76)
Ø 0.37
(9)
3/4 NPT 2 HOLES
5
.20
(132)
3
.60 (91)
2.18
(55)
4.37
(111)
1.37
(
35)
Ø 0.28 x 3 HOLES
(7)
1.93
(49)
0.32
(8)
5
.23
(133)
2.31
(59)
Ø 3.90
(99)
0.03
(1)
3.58
(
91)
0.31
(8)
1.22
(31)
0.37
(9)
2.31
ACTIVE BULB
(59)
1.31
(33)
“S”
1/2 NPT MALE
3/4 NPT 2 HOLES
7/8 HEX
LENGTH
Temperature switch – direct mount
B-Series Temperature Switches
emperature switch – remote mount
T
Temperature switch – direct mount
BULLETIN SW10-T
Temperature switch – remote mount
Page 6
BULLETIN SW10-T
All specification s are s ubject t o change without notice.
All sales subject to standar d terms and con ditions.
© Ashcroft Inc. 2014 1 0/14
Ashcroft Inc., 250 East M ain Stre et, S trat ford, CT 06614 USA
Tel: 203-378- 8281 • Fax: 203-385-0408
email: inf o@ashcrof t.com • www.a shcroft.c om
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