Ashcroft 1131 설치 지침

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Installation Instructions for

ASHCROFT

Model 1131

Differential Pressure Gauge/Switch

REED SWITCH

HIGH

POINTER

MAGNET

ROTARY MAGNET

Rolling 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 1131 consists of a rolling diaphragm to sense the pres-

sure difference. This model cannot see reverse pressure. It can

withstand maximum operating pressure up to 3000 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 allow-

able limit of 3000 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&M008-10088-12/01 07/13

RANGE SPRING

ROLLING DIAPHRAGM

Model 1131

PRECAUTIONS

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

Do not pressurize low side beyond 25 bar. 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

LOW

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

sides, otherwise calibration will be affected. Panel mounted

gauges should be installed in non-ferrous panel material.

However, gauges with 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