ASHCROFT A-Series Miniature Watertight Pressure Switches Installation Guide
- June 3, 2024
- ASHCROFT
Table of Contents
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
| CODE | VAC RATING | VDC RATING |
|---|---|---|
| H | 5A @ 125/250VAC | 5A @ 28Vdc resistive |
| 3A @ 28Vdc inductive | ||
| P | 3A @ 125VAC | 2A @ 30Vdc resistive |
| G | 0.1 A @ 125VAC | 0.1A @ 30Vdc resistive |
| L | 1A @ 125VAC | 1A @ 28Vdc resistive |
| L | 1A @ 125VAC | 0.5A @ 28Vdcinductive |
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
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© 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