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Installation and Maintenance Instructions

for ASHCROFT

L-Series Snap Action

Switches for Differential Pressure Control

OPERATION

The ASHCROFT

differential 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 a SPDT switch with various electrical ratings.

Several wetted material constructions for compatibility with

pressure media may be obtained.

Series LD-S switches have a fixed deadband which will be

within the limits noted on the nameplate.

Series LD-D switches may be set to operate simultaneously or

up to 85 percent of the range apart.The deadband of each

witch will be within the limits noted on the nameplate.

Ser

ies LD-A switches may be set to operate with any dead-

band within the limits shown on the nameplate.

MOUNTING

The “L” Series ASHCROFT

snap action differential pressure

switch has a NEMA-4X enclosure which is an epoxy coated

aluminum casting.

Two holes in the integral bracket are used to surface mount

the control.

Location of these holes is shown on the gener

dimension drawings. An optional pipe mounting bracket is also

available.Mount on a vibration free surface or pipe in any

ientation.

PRESSURE CONNECTIONS

For operation as a differential pressure control – connect the

high pressure to the side port marked “H” and the low pressure

to the side port marked “L.”

CONDUIT CONNECTIONS

One

⁄

4 NPT hole fitted with a shipping plug, and two additional

knock outs are provided.The knockouts may be removed by

placing a screwdriver in the slot and rapping sharply with a

hammer. It is recommended that Teflon tape or other sealant be

used on conduit bushing or plug threads to ensure integrity of

the enclosure.

ELECTRICAL CONNECTION

Remove cover, held in place by two screws.

On all units except one with terminal blocks – wire directly to

the switch according to circuit requirements. Units with terminal

locks – wire directly to ter

minal blocks as required.Terminals

are mar

ked common (C), normally open (NO) and normally

closed (NC).

STANDARD RANGES

30, 60, 90, 200, 400 psid

2.06

(52)

1.21

(31)

0.38 (10)

3.94

(

100)

3.26

(83)

0.91

(23)

.02

(153)

.09

(

155)

3/4 NPT

.12

(105)

0.25

(

2.50

(64)

Ø2. 3 1

( 5 9 )

1 / 4N PT

LOW

EMALE

PRESSURE

PORT

1/ 4NP T

HIGH

FEMALE

P RESSURE

ORT

4.1 lbs.

2007 Ashcroft Inc., 250 East Main Street, Str

atford, 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&M009-10016-10/00 (250-2871) AMR 12/07

1 2 3

LEFT SWITCH

TERMINAL BLOCK

RIGHT SWITCH

TERMINAL BLOCK

SERVICE LEADS TO THESE TERMINALS

1 2

L-Series Snap Action 1

Résumé du contenu

Page 1 - L-Series Snap Action

Installation and Maintenance Instructions for ASHCROFT®L-Series Snap Action Switches for Differential Pressure ControlOPERATIONThe ASHCROFT®differenti

Page 2

SETPOINT ADJUSTMENTSSetpoints are changed by means of the setpoint adjusters.TheLD-S single switch has one adjuster and the LD-A adjustabledeadband an

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Ashcroft LD - Differential Pressure Switches Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Instruments de mesure Ashcroft LD - Differential Pressure Switches. Ashcroft LD - Differential Pressure Switches User Manual [en] [fr] Manuel d'utilisatio

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