Ashcroft A Series Installation And Maintenance Instructions - Page 4

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INSTALLATION

• To minimize the risk of injury, the switch enclosure must be

selected according to the area classification and installed

according to the required safety and electrical codes.

• Torque should always be applied to the Hex portion of the

body, never to any other part of the body for it may alter

the setpoint. It is recommended that Teflon tape or other

sealant be used on the threads prior to installing to prevent

leaks in the system.

• The ambient temperature limits for the switches are –40° to

100°C (varies with seal ordered).

• Switch should be protected from excessive shock and

vibration.

• The cover of the APA switch should be closed at all times

when the switch is in operation.

CAUTIONS

• Always close the cover of the APA switch after making any

setpoint adjustments.

• Do not exceed current or voltage limits.

• The protection degree of the switch is only valid when

the switch is installed in accordance with all safety and

electrical codes and regulations.

CLEANING

• Never use aggressive solvents.

• Do not use high pressure water to clean the switch.

For the name and location of the nearest sales

representative, contact the Stratford Office.

Ashcroft Inc.

250 East Main Street

Stratford, CT 06614

Tel: 203-378-8281

Fax: 203-385-0408

www.ashcroft.com

All sales subject to standard terms and conditions of sale. I&M002-10038-10_00(250-3129) Rev. 03/22

MAINTENANCE/TROUBLESHOOTING

• All Ashcroft switches require little or no maintenance.

• Be sure the cover on the APA switch is closed at all times.

• When the switch is exposed to process media that may

harden and/or build up in the pressure port, the switch

should be removed and cleaned as required.

• If the switch does not function, only trained and skilled

personnel should check on the wiring, power supply and/or

mounting.

• If the problem cannot be solved, please contact one of the

Ashcroft affiliates or distributors.

FACTORY SETPOINTS

The APS switches and APA switches with a setpoint called

out in the product code are set at the factory as follows:

• Increasing Setpoint (R) Rising Pressure or Decreasing

Vacuum – Normally Open contact will close when the

pressure is raised from 0 psig to the setpoint. The

resetpoint is then measured from the setpoint, reducing the

pressure until the Normally Open contact opens.

• Decreasing Setpoint (D) Decreasing Pressure or Increasing

Vacuum – Normally closed contact will close when the

pressure is lowered from full range pressure to the setpoint.

The reset is then measured from the setpoint, increasing the

pressure until the Normally Closed contact opens.

Note: When ordered as a –15/15 psi range switch, depending

on setpoint, the Normally Open contact may be closed

as received.

Safety Manual and SIL Certificate, CRN available on