ASHCROFT A-Series Miniature Watertight Pressure Switches Installation Guide

A-Series Miniature Watertight Pressure Switches
Installation Guide

A-Series Miniature Watertight Pressure Switches

SLIDE COVER DOWN TO ACCESS SETPOINT ADJUSTMENT SLIDE COVER UP TO CLOSE AND SEAL ADJUSTMENT
ROTATE LEFT < TO INCREASE SETPOINT ROTATE RIGHT > TO DECREASE SETPOINT Ø .095 OR SMALLER TOOL REQUIRED TO ROTATE NUT

INTRODUCTION

The APS and APA pressure switch have NEMA 6, IP 67 Rated 316 stainless steel housing and process connections. The APS has a factory fixed setpoint which cannot be changed in the field. The APA is field adjustable and can easily be adjusted by following the instructions in the  diaphragm above.
ELECTRICAL CONNECTION
The APS and APA switch is available with many various electrical connections. Refer to  the figures on  other side  for  wiring color  codes and identification   of  terminals. Depending on the  configuration, the Micro DIN mating  connector may or  may  not be supplied with the switch.

• Only trained and skilled personnel are allowed to attach the wires to the electrical terminals of the switch.
• Cable couplers, glands and conduit connectors must have the correct electrical approvals as required by local electrical codes.
• The ground wire/connector is connected to the switch housin0g.
• Fully insulated mating spade terminals must be used on all spade terminal connections to prevent a shock hazard and maintain compliance with approvals.

MICRO SWITCH RATINGS

WIRE COLOR/FUNCTION

WIRE COLOR| SWITCH| FUNCTION
RED| SW1| NC
WHITE| SW1| C
BLUE| SW1| NO
WHITE/BLACK| SW2| C
RED/BLACK| SW2| NC
BLUE/BLACK| SW2| NO
GREEN| –| Ground

1 – COMMON
2 – NORMALLY CLOSED
3 – NORMALLY OPEN
4 – Ground

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.

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 theNormally Open  contactopens.
• Decreasing Setpoint (D) Decreasing Pressure or Increasing Vacuum – Normally closed contact will close when the pressure is lowered from full range  pressureto 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  witch, depending on setpoint, the Normally Open contact may be closed as received.
Safety Manual and SIL Certificate, CRN available on www.ashcroft.com

LOOK FOR THESE MARKS ON OUR PRODUCTS
© 2011 Ashcroft Inc., 250 East Main Street, Stratford, 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 &M009-10045-10/11 (250-2966) Rev. 07/13

References

• Pressure Instruments - Temperature Instruments | Ashcroft

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