Ashcroft 1132 Instructions d'installation

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Installation Instructions for

ASHCROFT

Model 1132

Differential Pressure Gauge/Switch

REED SWITCH (OPTIONAL)

POINTER

HIGH

MAGNET

ROTARY MAGNET

Small Convoluted Diaphragm

For efficient working of your gauge, please read all instructions

carefully before attempting to install.

CAUTION: Do not exceed maximum operating pressure given

on the gauge label. Check fluid compatibility with wetted parts

before use.

OPERATING PRINCIPLE

High and Low pressures are separated by a sensor assembly

consisting of a magnet, diaphragm and a range spring. The

difference in pressure causes the sensor assembly to move in

proportion to the change against a range spring.

A rotary magnet, located in a separate body compartment and

isolated from the acting pressures is rotated by a magnetic

coupling following the linear movement of the sensor assembly.

A pointer attached to the rotary magnet indicates differential

pressure on the dial.

SWITCH: Reed switches (optional) are located adjacent to the

pressure chamber and are activated by the magnetic field of

the sensor assembly.

Note: The gauges are calibrated to give ±2% full scale accura-

cy on ascending readings.

INSTALLATION

For better performance the gauge should be mounted horizon-

tally with the dial vertical. Depressurize the system and con-

nect the high and low pressure lines of your system to the

"High" and "Low " ports of the gauge, respectively.

It is recommended to use "O" rings with male connectors to

avoid excessive tightening and to prevent leakage (for parallel

threads). The gauge is now ready for operation. Apply "High"

and "Low " pressures simultaneously, to avoid damage to the

internal parts.

Model 1132 consists of a small convoluted diaphragm to

sense the pressure difference. It can withstand maximum

operating pressure up to 1500 psi for all ranges. If pressure

exceeds the rated maximum pressure, "O" rings and

diaphragm inside the pressure chamber, will be damaged. If

maximum operating pressure is within the allowable limit of

1500 psi, but the differential pressure exceeds gauge range,

there will be no damage to the gauge. The pointer will only go

to the extreme right end of the scale.

All sales subject to standard terms and conditions of sale. I&M008-10087-11/01 AMR 2C09/09

RANGE SPRING

CONVOLUTED DIAPHRAGM

Model 1132

PRECAUTIONS

Do not connect "High" and "Low" ports to the wrong pipe ends.

Do not subject the gauge to excessive vibration. The gauge is

never to be used in an area where a magnetic field is present.

It may show the wrong readings.

As the gauge works on a magnetic coupling principle, use only

non-magnetic fittings, parts, etc. in areas closer than 2˝ on all

sides, otherwise calibration will be affected. Panel mounted

LOW

gauges should be installed in non-ferrous panel material.

However, gauges with 2˝ and 2.5˝ dials, mounted in steel

panels, may require pointer adjustment. This is done by the

manufacturer, upon request.

Do not try to open any part of the gauge for any reason, be-

cause if not reassembled properly calibration will be affected.

SWITCH SETTING

Please follow these instructions when your differential pressure

gauges are supplied with a switch. The switches are normally

factory set to save the customer time. However, they are field

adjustable.

CAUTION: Supply voltage should not exceed switch rating. For

higher supply, use of relay circuit is recommended.

SWITCH ADJUSTMENT

The following procedure must be done by putting the gauge on

test bench or while in actual service. The switch adjustment

screw is located on the plastic cover. Rotate the screw counter

clockwise to increase the setpoint and clockwise to decrease

the setpoint. One or two trials may be necessary to attain the

exact setpoint.

Increase setpoint

counter clockwise

View from high pressure side