Ashcroft G - Pressure switches - Manual

Installation and Maintenance Instructions
for ASHCROFT
® G-Series Snap Action
Switches for Pressure Control
OPERATION
The ASHCROFT
® pressure control is a precision device which
features a snap action switch. Fixed deadband is available with
single or dual SPDT independently adjustable switches with
various electrical ratings. Adjustable deadband is available with
SPDT switch with various electrical ratings. Several wetted
material constructions for compatibility with pressure media may
be obtained.
Series GP-S switches have a fixed deadband which will be
within the limits noted on the nameplate.
Series GP-D switches may be set to operate simultaneously
or up to 85 percent of the range apart. The deadband of each
switch will be within the limits noted on the nameplate.
Series GP-A switches may be set to operate with any dead-
band within the limits shown on the nameplate.
MOUNTING
The “G” Series ASHCROFT
® snap action pressure switch has a
NEMA-4X enclosure which is made of 316 stainless steel.
Two holes in the bracket supplied are used to surface mount
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 in any orien-
tation. When tightening control to pressure line, always use the
wrench flats or hex on the pressure connection. NEVER
TIGHTEN BY TWISTING THE CASE.
CONDUIT CONNECTIONS
One
3 ⁄
4
NPSM conduit adapter of 316 stainless steel is provided.
It is recommended that Teflon tape or other sealant be used on
conduit bushings or plug threads to ensure integrity of the
enclosure.
ELECTRICAL CONNECTION
Remove cover, held in place by four screws.
On all units except one with terminal blocks – wire directly to
the switch according to circuit requirements. Units with terminal
blocks – wire directly to terminal blocks as required. Terminals
are marked common (C), normally open (NO) and normally
closed (NC).
SETPOINT ADJUSTMENTS
Setpoints are changed by means of the setpoint adjusters. The
GP-S single switch has one adjuster and the GP-A adjustable
deadband and GP-D dual switch each have two adjusters. On
switches with two adjusters, the one on the left is referred to as
“A” and the right one is referred to as “B”; see illustration.
Setpoints can be adjusted from 20 to 100 percent of full range
on increasing pressure.
STANDARD RANGES
30, 60, 100, 150 in.H
2
O
15˝H
2
O Vac.-15˝H
2
O
2.8 lbs. (1.3kg) 3.7 lbs. (1.7kg)
psi Ranges in. H
2
O Ranges
STANDARD RANGES
15, 20, 30, 60, 100, 200, 400, 600 psi
*1000,2000, 3000 psi
30˝Hg Vac.-0 psi
1
2
3
1
2
3
LEFT SWITCH
TERMINAL BLOCK
RIGHT SWITCH
TERMINAL BLOCK
SERVICE LEADS TO THESE TERMINALS
NC
NO
C
2.64
(67)
4.78
(121)
0.25
(6)
2.26
(57)
2.50
(64)
5.68
(144)
1.60
(41)
2.10
(53)
1.86
(47)
0.38
(10)
4.13
(105)
4.17
(106)
3.50
(89)
3/4 NPT FEMALE
CONDUIT ADAPTER
X06 VARIATION:
1/2 NPT MALE &
1/4 NPT FEMALE
70A2115 G-SERIES 0/15-0/600psi
2.64
(67)
4.78
(121)
3.50
(89)
Ø5.12
( 130)
1.7 5
1/4 NPT FEMALE
5.68
( 1 4 4)
1. 60
( 41)
2. 10
( 53)
1. 86
( 47)
0.38
( 10 )
4.17
( 10 6 )
4.53
( 115 )
3. 48
( 88 ) 3/4 NPT FEMALE
CONDUIT ADAPTER
70A2114 G-SERIES ˝ H2O
© 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&M009/10019-10/00 (250-2891) AMR 12/07
A B
0
20
40
60
0
20
40
60