The PSW21 and PSW22 Series have been discontinued. Some stock still remains; please check the specific item you are seeking to see if there is remaining inventory. Please see the Pressure Switch Product Finder or contact Omega Sales for possible alternatives.
These compact pressure and vacuum switches are designed and manufactured to exacting standards to meet the needs of OEM manufacturers and instrument makers for a low cost, stable, repeatable switch. Plastic mechanisms and housings are acetal to minimize moisture absorption and maintain dimensional stability. Plastic welding is accomplished using advanced microprocessor controlled ultrasonic welding equipment. All switches are 100% tested at high and low settings and at the proof pressure. Units are delivered with the setpoint at approximately the midpoint of the adjustable range.
Custom pressure switches are available, with a 50 piece minimum order; please consult Pressure Engineering for price and delivery. Cusotm options include factory setting at specified setpoint, Noryl switch body, Nitrile diaphragm, and DPDT switches can be configured for different pressure settings.
SPECIFICATIONS Approval: UL recognized, CSA certified switches; microswitches bear the CE and ENEC mark Temperature Range: -10 to 70°C (14 to 158°F) Setpoint Accuracy: ±10% of setting at 70°F Note: Pressure settings may change over the temperature range. Hysteresis (Deadband): 15 to 25% of the setpoint. Electrical: See the table for the switch amp rating, 250 Vac Terminals: 6.35 mm (0.25") standard “Slide-On” male Materials of Construction Body and Mechanism: Acetal Diaphragm: EPDM (Ethylene- Propylene Diene Monomer) Screws: Stainless or zinc plated steel Springs: Stainless Steel Media Compatibility: Air, water, and many other fluids and gases that are compatible with EPDM and Acetal Note: Mineral Oil and similar fluids are not compatible with EPDM. Request Nitrile diaphragm (Consult with Pressure Engineering for Custom Switch info). Weight: 50 g (1.8 oz) Overall Dimensions: Approx. 54 x 76 x 45 mm (2.125 x 3 x 1.75") Setting: The Pressure Switch is field adjustable using the hex head set screw at the center of the pressure switch (PSW 21/22-WRENCH).
The Vacuum Switch is field adjustable using the Phillips head screw on the switch carrier. Dual Pressure Switch: The DPDT (two switches) will both change state at approximately the same setpoint. On DPDT units, one switch may be set to lead or lag the other (see Custom Switches above).
† All amounts shown in USD Ordering Example: (1) PSW21D adjustable pressure switch, 1/8 MNPT fitting, 4-11 psig setpoint range, 25 A switch, $34.50
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