Ashcroft LPSN4HB25 30IMV/15#, LPDN4GGB25 15#, GPDN4GGB25 400#, LPDN4GGB25 100IW, LPAN4HB06 2000# User manual

Installation and Maintenance Instructions

1 2 3

1 2 3

LEFT SWITCH

TERMINAL BLOCK

RIGHT SWITCH

TERMINAL BLOCK

SERVICE LEADS TOTHESE 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 NPTFEMALE

CONDUIT ADAPTER

X06VARIATION:
1/2 NPT MALE &
1/4 NPT FEMALE

2.64
(67)

4.78

(121)

3.50
(89)

Ø

5.12

( 1 30)

1.7 5

1/4 NPT FEMALE

5.68

( 1 44)

1. 6 0
( 4 1)

2. 1 0
( 5 3)

1. 8 6
( 4 7)

0.38
( 1 0 )

4.17

( 1 0 6)

4.53

( 1 15 )

3. 4 8
( 8 8 )

3/4 NPT FEMALE

CONDUIT ADAPTER

A

B

0
20
40
60

0
20
40
60

for ASHCROFT®G-Series Snap Action
Switches for Pressure Control

psi Ranges

STANDARD RANGES

2.8 lbs. (1.3kg) 3.7 lbs. (1.7kg)

OPERATION

The ASHCROFT
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 dead­band within the limits shown on the nameplate.

®

15, 20, 30, 60, 100, 200, 400, 600 psi

*1000,2000, 3000 psi

30˝Hg Vac.-0 psi

pressure control is a precision device which

O Ranges

in.

H

2

STANDARD RANGES

30, 60, 100, 150 in.H

O Vac.-15˝H2O

15˝H

2

O

2

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 orien­tation.When tightening control to pressure line, always use the
wrench flats or hex on the pressure connection.NEVER

TIGHTEN BY

CONDUIT CONNECTIONS

3

One

⁄

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

Remov

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).

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TWISTING THE CASE.

e cover, held in place by four screws.

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SETPOINT ADJUSTMENTS

Setpoints are changed by means of the setpoint adjusters.The
GP-S single s

witch 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.

Installation and Maintenance Instructions
for ASHCROFT®G-Series Snap Action
Switches for Pressure Control

SERIES GP-S SINGLE SWITCH

Remove cover.For setpoint adjustment on either increasing or
decreasing pressure to within ±1% of nominal r
switch on a calibration stand and use a suitable reference such
as an ASHCROFT
with a light or meter.Pressurize the system to the required
setpoint pressure.

If setpoint is on increasing pressure, turn adjuster so that
switch operates (if common – normally closed circuit is being
monitored light goes off). If setpoint is on decreasing pressure,
turn adjuster so that switch resets (if common – normally closed
circuit is being monitored light comes on).When the setpoint
has been achieved, raise and lower the pressure to ensure that
the setpoint is correct.

The dead band (difference between the operate and reset
pressures) may be verified at this time to be between the values
noted on the nameplate label.

SERIES GP-D DUAL SWITCH

Remove cover.For setpoint adjustment on either increasing or
decreasing pressure to within ±1% of nominal range
switch on a calibration stand and use a suitable reference such
as an ASHCROFT
with a light or meter.

Pressurize the system to the required higher setpoint pressure
and turn adjuster “B” until the switch operates or resets as
required. See discussion of increasing or decreasing pressure
setpoints and deadband verification under Series GP-S Single
Switch.When the setpoint has been achieved, raise and lower
the pressure to ensure that the setpoint is correct.Then reduce
system pressure to the required lower setpoint pressure and
turn adjuster “A” until the switch operates or resets as required.
Verify this setpoint by raising and lowering pressure.Now
increase system pressure to higher setpoint and make final
adjustment on “B.”

®

Duragauge or test gauge.Monitor switch

®

Duragauge or test gauge.Monitor switch

ange, mount the

, mount the

SERIES GP-A ADJUSTABLE DEADBAND SWITCH

Remove cover.Adjuster “B” controls the operating point of the
s

witch on increasing pressure. Adjuster “A” controls the re-

setpoint of the switch on decreasing pressure.

For accurate setpoint adjustment, mount the switch on a
calibration stand and use a suitable reference such as an
ASHCROFT
light or meter.Pressurize the system to the required setpoint
pressure.Tur n adjuster “B” until switch operates.Then lower
pressure to the re-setpoint, turn adjuster “A” until the switch
resets. Now increase pressure to the operating point and make
final adjustment on “B.” Raise and lower pressure to ensure that
the setpoint and re-setpoint are correct.

SOME PRECAUTIONS TO OBSERVE

Do not loosen the screws holding the precision switch element(s)
or mounting br

Nameplate PROOF pressure should not be exceeded.
Inter

mittent operation up to proof pressure is permissible,

however, some change of setpoint may be noted.

Operation and correct setpoint actuation should be routinely
tested.

Note – Since v

®

Duragauge or test gauge.Monitor switch with a

acket in place.

acuum models are already above setpoint at
atmosphere, the Normally Open (NO) circuit will be
closed as received.

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