Ashcroft 1143 Instruções de instalação

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Installation Instructions for

ASHCROFT

Model 1133 & 1143

Differential Pressure Gauge/Switch

POINTER

HIGH

MAGNET

ROTARY MAGNET

Model 1133/1143

Large Convoluted Diaphragm

For proper operation of your gauge, please read all

instructions carefully before installing.

CAUTION: Do not exceed maximum operating pressure given

on the gauge label. Check fluid compatibility with wetted parts

before use.

LIABILITY

The liability of the manufacturer is null and void in case

of damage caused by incorrect use, failure to comply

with manufacturer's instructions, failure to comply with

local accident prevention safety laws and the handling by

untrained personnel.

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

accuracy on ascending readings.

INSTALLATION

For better performance the gauge should be mounted

horizontally with the dial vertical. Two mounting holes

should be used for mounting (when applicable). Select

instrument location where it is not subjected to heavy

vibration or shock. Depressurize the system and connect

the high and low pressure lines of your system to the "High"

and "Low " ports of the gauge, respectively.

It is recommended for tapered threads to use thread

sealant tape and for parallel threads it is recommended

All sales subject to standard terms and conditions of sale. 1133-1143_i&m_RevA_Ltr_(008-10086)_05-15-19

REED SWITCH

DIAPHRAGM

to use "O" rings with male connectors to avoid excessive

tightening and to prevent leakage. The gauge is now

ready for operation. Apply "High" and "Low " pressures

simultaneously, to avoid damage to the internal parts.

Models 1133 & 1143 consists of a large convoluted

diaphragm design for low differential pressure. It can

withstand maximum operating pressure up to 500 psi. If

pressure exceeds the rated maximum pressure, damage

will occur.

LOW

PRECAUTIONS

Do not connect "High" and "Low" ports incorrectly. Do

not subject the gauge to excessive vibration. The gauge

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

present as 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 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 the back housing of the gauge for any

reason as 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 time the customer time.

However, they are field adjustable.

CAUTION: Supply voltage should not exceed switch rating.

For higher supply, adding a relay is recommended.

SWITCH ADJUSTMENT

The following procedure must be done by putting the

gauge on a 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 set point

counter clockwise

View from high pressure side