Omega Products PSW21A Installation Manual
PSW21 and PSW22 Series
Compact, rugged, adjustable pressure & vacuum switches
INSTRUCTION
SHEET
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M4068-0504
Installation instructions for OMEGA PSW21 & PSW22 Series: Compact, rugged,
adjustable Pressure & Vacuum Switches
General
The PSW21 & PSW22 series are compact pressure and vacuum switches that 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.
.
Mounting Instructions
PSW21 switches are mounted with a 9/16-18UNF mounting thread, with nut included and a 1/8" NPT male
connector.
PSW21 Series
1/8 NPT
Electrical/Pneumatic Specifications for Pressure Series
Model No. Adjustable Range Proof Pressure SPDT Switch Rating
PSW21A 3 to 7" H20 20 psig 3 amps (resistive)
PSW21B 5 to 35" H2O 20 psig 5 amps (resistive)
PSW21C 1 to 6 psig 50 psig 21 amps (resistive)
PSW21D 4 to 11 psig 50 psig 25 amps (resistive)
PSW21E 9 to 18 psig 50 psig 25 amps (resistive)
PSW21F 15 to 28 psig 50 psig 25 amps (resistive)
PSW21G 25 to 40 psig 200 psig 25 amps (resistive)
PSW21H 35 to 65 psig 200 psig 25 amps (resistive)
PSW21J 50 to 100 psig 200 psig 25 amps (resistive)
PSW21K 75 to 120 psig 200 psig 25 amps (resistive)
Model No. Adjustable Range Proof Pressure
PSW21BD 10 to 35" H2O 250" H2O 5 amps (resistive)
PSW21CD 1 to 6 psig 50 psig 21 amps (resistive)
PSW21DD 4 to 11 psig 50 psig 25 amps (resistive)
PSW21ED 9 to 18 psig 50 psig 25 amps (resistive)
PSW21FD 15 to 28 psig 50 psig 25 amps (resistive)
PSW21GD 25 to 40 psig 200 psig 25 amps (resistive)
PSW21HD 35 to 65 psig 200 psig 25 amps (resistive)
PSW21JD 50 to 100 psig 200 psig 25 amps (resistive)
PSW21KD 75 to 120 psig 200 psig 25 amps (resistive)
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