Ashcroft P-N7 pressure switches - Manual

Installation and Maintenance Instructions for
ASHCROFT ® High Pressure P-Series
Snap Action Switches with Buna N, Viton and
Teflon Diaphragms for Pressure Control
INTRODUCTION
The Ashcroft pressure control is a precision device which fea-
tures 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
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-
figurations. The enclosure is an epoxy coated aluminum casting.
INSTALLATION
This control is a precision instrument and should never 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 shown on the general
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 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, norm open and norm closed.
1.06
(27)
2.30
(58)
0.38
(10)
4.75
(121)
3.88
(99)
5.50
(140)
5.00
(127)
Ø 0.31 X 4 HOLES
3/4 NPT
TYP
Ø 3.90
(99)
4.70
(119)
2.90
(74)
3.06
(78)
7.72
1/4 NPT PORT
8.08
1/2 NPT MALE &
1/4 NPT FEMALE
(205)
(8)
(196
psi Ranges
N4 – 5.0 lb. (2.3)
N7 – 5.6 lb. (2.5)
STANDARD RANGES
1000, 2000, 3000 psi
© 2014 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&M009-10212 P Series 03/2014
TERMINAL BLOCK
SWITCH A
TERMINAL BLOCK
SWITCH B
2
1
3
2
1
3
NC
NO
C
NC
NO
C