Owner's manual

Installation and Maintenance Instructions for
ASHCROFT
®
P-Series Snap Action
Switches for Pressure Control
INTRODUCTION
The Ashcroft pressure control is a precision de
vice which fea
-
tures a snap action s
witch.
Fixed deadband is available with
single or dual SPDT independently adjustable switches with
v
ar
ious electrical r
atings
.
Adjustab
le deadband is available with
a SPDT switch with various electrical ratings. Several wetted
material constructions for compatibility with pressure media may
be obtained.
The “P” Series Ashcroft snap action pressure switch is available
in both standard NEMA~ and explosion-proof NEMA 7 & 9 con-
figur
ations.
The enclosure is an epoxy coated aluminum casting.
INSTALLATION
This control is a precision instr
ument and should ne
v
er be left
with internal components exposed. During installation insure that
covers are in place and conduit openings are sealed.
MOUNTING
Four holes in the bracket supplied are used in surface mounting
of the control.
Location of these holes is sho
wn on the gener
al
dimension drawings. An optional pipe mounting bracket is also
available. Mount on a vibration free surface or pipe. When tighten-
ing control to pressure line, always use the wrench flats or hex
on the pressure connection. Never tighten by twisting the case.
ELECTRICAL CONNECTION
Remove top cover, cover unscrews (CCW).
On all units except one with ter
minal bloc
ks-wire directly to the
s
witch according to circuit requirements. Units with terminal
b
locks-wire directly to terminal blocks as required. Terminals are
marked common, norm open and norm closed.
1
.06
(
27)
2.30
(58)
0.38
(10)
4.75
(
121)
3
.88
(
99)
5.50
(
140)
5 .0 0
(
12 7)
Ø
0 .3 1X 4 HOLES
3
/4 NPT
T
YP
Ø
3. 90
(
99)
4. 70
(
119 )
2.90
(
7 4 )
3.06
(7 8 )
7
.7 2
1
/4 NPT PORT
8
.0 8
1
/2 NPT MALE &
1/4 NPT FEMALE
70A1886 - P-Series Vac-600psi
(205 )
(
8)
(19 6)
70A1883 P-Series- ˝ H 2 O
1
.06
(
27)
2
.30
(
58)
0.38
(
10)
4
.75
(
121)
3
.88
(99)
5
.50
(140)
5.00
(127)
Ø 0.3 1X 4 HOLES
(8)
3
/4 NPT
TYP
Ø
3 .9 0
(9 9 )
4. 70
(119 )
2
. 9 0
(
74 )
3
. 06
(
78)
Ø
5 .12
(13 0)
5
. 32
(
13 5 )
8. 3 6
(
212 )
1
/4 NPT PORT
p
si Ranges
H
2
O Ranges
N4 – 5.0 lb. (2.3)
N7 – 5.6 lb. (2.5)
N4 – 5.7 lb. (2.6)
N7 – 6.3 lb. (2.9)
STANDARD RANGES
15, 30, 60, 100, 200, 400, 600 psi
1000, 2000, 3000 psi
30˝Hg vac.-0 psi
30˝Hg vac.-15 psi
STANDARD RANGES
30, 60, 100, 150 ˝H
2
O
© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M009-10013G-10/00 (250-2524) AMR 12/07
TERMINAL BLOCK
SWITCH A
TERMINAL BLOCK
SWITCH B
2
1
3
2
1
3
NC
NO
C
NC
NO
C