Pressure Switch
Miniature Vacuum or Differential Pressure Switch

PSW20A and PSW20B

Sensitive Pressure, Vacuum or Differential Pressure Switch

PSW20A and PSW20B:Pressure Switch
Miniature Vacuum or Differential Pressure Switch

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^$ 38.00 PSW20A

•	Low Cost
•	UL Recognized, CSA Cerified
•	High Sensitivity
•	For Pressure, Vacuum and Differential Applications
View related products - Pressure Switches

These sensitive single pole switches can be used as pressure or vacuum switches, or as differential pressure switches.

SPECIFICATIONS
Approvals: UL recognized, CSA certified
Temperature: -30 to 65°C(-23 to 149°F)
Setpoint Accuracy: ±10% of setting at 70°F
Note: Pressure settings may change over the temperature range.
Materials of Construction
Body: Acetal
Diaphragm: EPDM bonded to steel ring
Contacts: Gold plated silver
Springs: Plated Phospher Bronze
Terminals: Plated Copper or Brass
Pressure Connection: Spout for 1/8 ID tubing
Adjusting Screw: Stainless Steel or Zinc Plated Steel. Setting as shipped, 2 inches of H₂O negligible deadband
Media: Clean dry non-corrosive gases only.
Note: The pressure media entering through Port A is in direct contact with the electrical contacts in the switch. The media entering through Port B is separated from the electrical contacts by the diaphragm.
Weight: 9 g (0.3 oz)

Pressure Switching Normally Open Contacts
Connect the pressure source to Inlet Port B and set the adjusting screw to the desired pressure setpoint. Turning the screw clockwise narrows the gap between contacts and decreases the setpoint. Turning the screw counterclockwise increases the gap, increasing the setpoint. Note that the media entering through Port B is separated from the electrical contacts by the diaphragm.
Pressure Switching Normally Closed Contacts
Connect the pressure source to PortA and monitor continuity across the terminals. Slowly turn the adjusting screw clockwise, narrowing the gap between the contacts until the contacts are closed. Apply the setpoint pressure which will open the contacts. Continue to turn the adjusting screw clockwise until the contacts make and break at the desired setpoint.
Vacuum Switching:
Repeat above using Port A for Normally Open contacts and Port B for Normally Closed Contacts.

To Order (Specify Model Number)

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Part Number	Availability	Price	Description	RoHS	Qty.
PSW20A		$38.00	Range: 0.4 to 15 inH₂O, 8 psig Proof Pressure, Switch Rating: 750 mA @ 250 Vac (resistive)		qty.

PSW20B		$38.00	Range:1 to 20 inH₂O, 8 psig Proof Pressure, Switch Rating 1 A@ 50 Vac (resistive)		qty.

† All dollar amounts on this site are shown in US currency.

Note: Custom switches and pre-fixed setpoint at customer specified value available, 50 piece minimum order. Consult Pressure Engineering.