Ashcroft T700 - Temperature Switches User Manual
Snap action switches for temperature control, Introduction the ashcroft
Installation and Maintenance Instructions for
T400 & T700 ASHCROFT
®
Snap Action
Switches for Temperature Control
INTRODUCTION
The Ashcroft
®
temperature switch is a precision built U.L. and
C.S.A. approved control device which features a mechanical
snap action switch. Controllers are available for operation on
temperature with fixed or variable differential. Also, manual reset
types are available for operation on increasing or decreasing
temperature. The manual reset types remain tripped until reset
by pressing a button on the top of the enclosure. The standard
electrical switch is SPDT and is available with various electrical
characteristics. Two SPDT switch elements mounted together
are available except on variable deadband and manual reset
types. Bulb material is stainless steel.
The Ashcroft snap action temperature switch is furnished in the
standard NEMA 4/4X and explosion proof NEMA 7 and 9 enclo-
sure styles. Both enclosures are epoxy coated aluminum castings.
INSTALLATION
These controls are precision instruments and should never be
left with internal components exposed. During installation insure
that covers are in place and conduit openings are closed except
when actually working on the control. Good piping practice
requires the use of a thermowell for installation where pressure
may be applied to the thermal system. The thermowell provides
protection against physical damage as well as corrosive effects
of media flow. Use of a thermowell also facilitates removal of the
bulb from the process line without disturbing the process.
Standard thermowell materials include brass, steel and stainless
steel; other materials are available upon request. Selection
should be based on corrosion resistance requirements and
process pressure.
MOUNTING T400 AND T700 SERIES
There are three holes external to the enclosure for surface
mounting. Location of these holes is shown on the general
dimension drawing.
A. Direct - Mounted Controls
These controls have a
1
⁄
2
NPT threaded adapter and may be
attached directly or indirectly by means of a thermowell to
equipment to be controlled. When installing or removing con-
trol always use the wrench flats or hex above the threads.
Do not twist the housing.
0.22 (6)
3.32
(84)
3.26 (83)
0.28 (7) X 3 HOLES
4.03 (102)
Ø2 . 3 1
( 59)
4 . 6
1
(1 1 7
)
2. 3 1
ACTIVE BUL B
L E
NGTH
( 59)
2. 77
( 70)
2. 27
(58)
1. 25
(3 2
)
0.25
(6)
3.00
(76 )
Ø 0 .
37
(9)
“L”
2.50
(64 )
2.00
(51)
3/4 NPT
Ш
0.22
(6)
3.32
(84)
3.26 (83)
Ш 0 .
28 (7) X 3 HOLES
4. 03 ( 102 )
Ш2 .
3 1(59)
4.6 1
(117)
2.77
( 70 )
2. 2 7
( 58)
1. 2 5
( 3 2 )
0. 2 5
(6 )
Ш 0 . 3
7
( 9)
2. 0 0
( 51)
1. 3 1
( 3 3 )
2.3 1
ACTIVE BULB
LENGTH
(59)
“S”
3/4 NPT
1/2 NPT MALE
7/8 HEX
T400 REMOTE MOUNT
T400 DIRECT MOUNT
T700 REMOTE MOUNT
T700 DIRECT MOUNT
5.20
(132)
3.61
(92)
2.18
(55)
0.32
(8)
4.37
(111)
1.37
(35)
Ø 0 .
2 8x 3 HOLES
(7)
2 . 3 1
( 59)
5.2 3
( 13 3 )
1. 93
( 49)
2. 31
ACTIVE BULB
LENGTH
( 59)
Ø 3. 90
(99)
0.03
(1)
3. 58
(91)
0.31 ( 8 )
1. 2 2
( 3 1
)
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)
0.3 2
(8)
5. 23
(13 3
)
2.3 1
(59)
Ø 3 .
90
(99)
0.0 3
(1)
3.58
(91)
0.31
(8)
1.2 2
(3 1)
0.3 7
(9)
2.31
ACTIVE BULB
(59)
1.3 1
(33 )
“S”
1/2 NPT MALE
3/4 NPT 2 HOLES
7/8 HEX
LENGTH
STEM LENGTH – INCHES
S
2.75
4.0
6.0
9.0
12.0
LINE LENGTH – FEET
L
5.0
10.0
15.0
20.0
25.0
3.5 lbs.
2.5 lbs.
4.5 lbs.
3.7 lbs.
© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M009-10006-10/00 (250-2230G) AMR 12/07