PSW27, PSW28, PSW29 Series
Pressure & vacuum switches Compact, rugged, pre-fixed setpoint
INSTRUCTION SHEET
M4070-0504
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Installation instructions for OMEGA PSW27, PSW28 & PSW29 Series: Pressure and vacuum switches, compact, rugged, pre-fixed setpoint.
General These reliable, compact single pole switches are used in pressure and vacuum applications where moderate accuracy is sufficient. The fixed setpoint is factory set.
Additional Information Temperature Range: -10 to 75°C (14 to 167°F) Setpoint Accuracy: +/- 10% at 70°F. Note: pressure settings may change over the temperature range. Pressure Connection:
PSW27: 1/8" NPT male. PSW28: Center spout for 1/8" ID tubing. Provided with 9/16-18
mounting nut. PSW29: Radial spout for 1/8" ID tubing.
Approvals: UL recognized, CSA certified, microswitches bear the ENEC & CE Mark.
PSW27 Series
Mounting Instructions
PSW27 series come with a 1/8 NPT male pressure connection with a 9/16 threaded mounting, and nut is included.
Electrical/Pneumatic Specification for PSW27 Series Pressure Switches
Model No. Fixed Setpoint Proof Pressure SPDT Switch Rating
PSW27-1P
1 psig
30 psig
10 amps (resistive)
PSW27-2P
2 psig
50 psig
21 amps (resistive)
PSW27-5P
5 psig
50 psig
21 amps (resistive)
PSW27-10P
10 psig
50 psig
21 amps (resistive)
PSW27-20P
20 psig
50 psig
21 amps (resistive)
PSW27-30P
30 psig
80 psig
21 amps (resistive)
PSW27-40P
40 psig
80 psig
21 amps (resistive)
PSW27-50P
50 psig
80 psig
21 amps (resistive)
Electrical/Pneumatic Specifications for PSW27V Vacuum Switches
Model No. Fixed Setpoint Proof Pressure SPDT Switch Rating
PSW27V-25W 25" WC Vac PSW27V-30W 30" WC Vac PSW27V-40W 40" WC Vac PSW27V-50W 50" WC Vac PSW27V-75W 75" WC Vac PSW27V-100W 100" WC Vac PSW27V-150W 150" WC Vac PSW27V-200W 200" WC Vac
300" WC Vac 300" WC Vac 300" WC Vac 300" WC Vac 350" WC Vac 350" WC Vac 350" WC Vac 350" WC Vac
10 amps (resistive) 10 amps (resistive) 21 amps (resistive) 21 amps (resistive) 21 amps (resistive) 21 amps (resistive) 21 amps (resistive) 21 amps (resistive)
PSW28 Series
Mounting Instructions
PSW28 Series come with a center spout for 1/8” ID tubing, with a 9/16 mounting thread and tube lock nut included.
Electrical/Pneumatic Specifications for PSW28 Pressure Series
Model No. Fixed Setpoint Proof Pressure SPDT Switch Rating
PSW28-1P
1 psig
30 psig
10 amps (resistive)
PSW28-2P
2 psig
50 psig
21 amps (resistive)
PSW28-5P
5 psig
50 psig
21 amps (resistive)
PSW28-10P
10 psig
50 psig
25 amps (resistive)
PSW28-20P
20 psig
50 psig
25 amps (resistive)
PSW28-30P
30 psig
80 psig
25 amps (resistive)
PSW28-40P
40 psig
80 psig
25 amps (resistive)
PSW28-50P
50 psig
80 psig
25 amps (resistive)
Electrical/Pneumatic Specifications for PSW28V Vacuum Series
Model No. Fixed Setpoint Proof Pressure SPDT Switch Rating PSW28V-25W 25" WC Vac 300" WC Vac 10 amps (resistive) PSW28V-30W 30" WC Vac 300" WC Vac 10 amps (resistive) PSW28V-40W 40" WC Vac 300" WC Vac 21 amps (resistive) PSW28V-50W 50" WC Vac 300" WC Vac 21 amps (resistive) PSW28V-75W 75" WC Vac 350" WC Vac 21 amps (resistive) PSW28V-100W 100" WC Vac 350" WC Vac 21 amps (resistive)
PSW29 Series
Mounting Instructions Radial spout for 1/8" ID tubing. Through hole legs for mounting bolt. Electrical/Pneumatic Specifications for PSW29 Pressure series
Model No. Fixed Setpoint Proof Pressure SPDT Switch Rating
PSW29-1P
1 psig
30 psig
10 amps (resistive)
PSW29-2P
2 psig
50 psig
21 amps (resistive)
PSW29-5P
5 psig
50 psig
21 amps (resistive)
PSW29-10P
10 psig
50 psig
21 amps (resistive)
PSW29-20P
20 psig
50 psig
21 amps (resistive)
PSW29-30P
30 psig
50 psig
21 amps (resistive)
Materials of Construction (All Series)
Body
Diaphragm
Hysteresis (Dead Band)
Electrical Connection Proof Pressure
Acetal EPDM (Ethylene-Propylene Diene Monomer) The EPDM diaphragm should not be
used with petroleum products. Specificy Nitrile for these assplications. Pressure switches: approximately 25% of the setpoint. Vacuum switches: approximately 30% of the setpoint.
6.35mm (0.25:) standard “Slide-On” male terminals
See table.
Media Compatibility
Air, water and many other fluids and gases that are compatible with EPDM & Acetal. Note: Mineral Oil and similar fluids are not compatible with EPDM. Request Nitrile
diaphragm.
Overall Dimensions
46 x 51 x 26 mm (approximately 1.75" x 2" x 1")
Weight
6 g (0.2 oz)
Listings
UL Recognized & CSA Certified
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