Installation and Maintenance Instructions for
ASHCROFT
®
P-Series Snap Action
Switches for Temperature Control
INTRODUCTION
The Ashcroft temperature control is a precision device which
features a snap action switch. Fixed deadband is available with
single or dual SPDT independently adjustable switches with
v
arious electrical ratings.Adjustable deadband is available with
a SPDT s
witch with various electrical ratings. Bulb material is
stainless steel.
The “P” Series Ashcroft snap action pressure switch is available
in both standard NEMA-4 and explosion-proof NEMA 7 & 9 con-
figurations.The enclosure is an epoxy coated aluminum casting.
INSTALLATION
This control is a precision instrument and should never be left
with inter
nal components exposed.
During installation insure that
co
vers are in place and conduit openings are sealed.
Good piping practice requires the use of a well for installation
where pressure ma
y be applied to the ther
mal system, f
or pro-
tection against physical damage as well as corrosive effects of
media flow. Use of a well also facilitates removal of the bulb
from the process line without disturbing the process. Standard
well materials include brass,, steel, and stainless steel; other
materials are available on application. Selection should be based
on corrosion resistance requirements and process pressure
.
MOUNTING
F
our holes in the br
ac
k
et supplied are used in surf
ace
mounting of the control. Location of these holes is shown on the
general dimension drawings. An optional pipe mounting bracket
is also available. Mount on a vibration free surface or pipe.
A. STEM MOUNTED CONTROLS
These controls ha
ve a
1
⁄
2 NPT threaded adapter and ma
y be
attached directly (or indirectly b
y means of a thermowell) to
equipment to be controlled.WHEN INSTALLING OR
REMOVING CONTROL ALWAYS USE THE WRENCH
FLATS OR HEX ABOVE THE THREADS. DO NOT TWIST
THE HOUSING.
B. REMOTE MOUNTED CONTROLS
Two types of union bushings are available to install a remote-
mounted control b
ulb into a thermo
well or other
1
⁄
2 NPT thread
-
ed
hole. A non-pressure-tight type consists of a bushing, split
grommet and compression nut.To use this, the bulb is insert-
ed through the n
ut and the split g
rommet is slipped onto the
capillary between the compression nut, and the bushing.
After positioning the bulb as desired, tighten the compression
nut to the bushing.This will lock the capillary at the desired
location.The pressure-tight type is clamped to the bulb after
insertion by tightening a compression nut.To use this, the
union b
ushing is scre
wed into the
1
⁄
2 NPT threaded hole
.
The
compression nut and sleeve are slipped onto the bulb which
is then inserted into the union bushing. Bulb is then posi-
tioned and compression n
ut is hand tightened plus 2
1
⁄
4 tur
ns
.
This will lock the bulb at the desired location.
1.06
(27)
2.30
(
58)
0.38
(10)
4
.75
(
121)
3.88
(
99)
5
.50
(140)
5
.00
(
1 27 )
Ø0.3 1X 4 HOLES
(8 )
Ø
2.3 1
(5 9 )
3
/4 NPT
T
YP
2.3 1
(59 )
A
CTIVE
L
ENGTH
Ø 3. 90
(
9 9 )
4
. 7 0
(
1 1 9 )
3
. 0 6
(
7 8)
2
. 9 0
(7 4 )
7. 1 6
(
1 8 2 )
2
.5 0
(
6 4 )
“
L”
3
.0 0
(7 6 )
Ø0 . 3 7
(
9)
BULB
1.06
(27)
2.30
(
58)
0
.38
(10)
4.75
(121)
3.88
(99)
5.50
(140)
5.0 0
(
1 27 )
Ø0.31X 4 HOLES
(8 )
Ø2. 31
(59 )
3
/4 NPT
TYP
Ø3 .90
(
99 )
4
.7 0
(
119 )
3. 06
(
7 8)
2
. 90
(7 4)
7. 16
(1 82 )
“S”
Ø0.3 7
(9 )
2
. 3 1
(5 9 )
ACTIVE
LENGTH
1 /2 NPT
7 /8 HEX
1
. 31
MALE
B
ULB
(33)
N4 – 5.8 lb. (2.6)
N7 – 6.4 lb. (2.9)
N4 – 6.8 lb. (3.1)
N7 – 7.4 lb. (3.4)
Direct Mount Remote Mount
2
3
⁄
4 4 6 9 12
(70) (102) (152) (229) (305)
STEM LENGTH (S)
IN.
MM
© 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&M009-10012-10/00 (250-2551) AMR 12/07
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