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Industrial Differential Pressure Switch or Alarm

1 to 10 psi, fixed deadband


Item# PSW-181

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-24 $215.92
25-49 $205.12
50-99 $200.81
100-199 $192.17
200+ $187.85

In stock

Lead Time (If not in stock): 6 weeks
1 to 10 psi, fixed deadband PSW-181 PSW-181
  • 5 Amp Relay or Built In Audible Alarm Available
  • Up to 150 PSI Operating Pressure
  • NEMA-4 Rated Housing

PSW-181 Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Pressure Range
Deadband Range
Switch Type
Pressure Type
Pressure Port Size
Pressure Port Type

  • Connection Gender Female
  • Enclosure Rating NEMA-4
  • Maximum Ambient Temperature 80 {C} (176 {F})
  • Maximum Rating 5
  • Minimum Ambient Temperature -30 {C} (-22 {F})
  • Pressure Type Differential
  • Pressure Units PSID
  • repeatability 1% of span
  • Shock 15 g
  • Vibration MIL STD 810C
The PSW-180 Series differential pressure switch offers a blend of small size, excellent performance and environmental protection. The PSW-180 is available with switch contacts or as an audible alarm.

Switch: SPDT rated at 5 amp at 250/125 Vac, 5 amps at 30 Vdc, gold-clad contacts
Audible Alarm: Internal 9 Vdc battery powered, continuous tone 85 dB (battery included)
Repeatability: 1% of span
Ambient Temperature:
   Storage: -30 to 80°C (-22 to 176°F)
   Operating: 0 to 70°C (32 to 158°F)
Max Media Temp: 95°C (203°F) @ 100 psi
Vibration: MIL STD 810C, 2.5 g’s 5-500 cps
Shock: 15 g’s, 10 msec duration.
Working Pressure: 0-150 psid at up to 70°C (158°F) air temperature
Differential Proof Pres: 150 psid at up to 70°C (158°F) air temperature
Enclosure: NEMA-4, reinforced polyester body, zinc-plated steel cover with neoprene gasket, terminal block wiring
Adjustment: multi-turn screw, accessible from outside enclosure
Pressure Port: 1/4 NPTF brass or 1/4 NPSF polysulfone
   Polysulfone: 70 W x 60 D x 89 H mm (2.75 x 2.38 x 3.5')
   Brass: 80 W x 60 D x 89 H mm (3.13 x 2.38 x 3.5')
Weight: 165 g (5.8 oz) (approximate)
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Rated 4 out of 5 by from Excellent product I use these DP switches on my automatic self-cleaning strainers, and I am very happy with them. They are compact, robust, dependable, sufficiently accurate and economically priced. The product is exactly what the literature says it is!
Date published: 2015-11-24
Rated 5 out of 5 by from excelnt products I use this ítem verywell in my chiller protección Systems. Reliable products. recommended.
Date published: 2018-07-21
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Is there a reseal kit available for the PSW-184?

Asked by: CA12454
Thank you for your inquiry. There are no field repair kits available for the PSW-180 Series pressure switches
Answered by: JK Applications Engineer
Date published: 2024-04-17

IS this differential pressure switch CSA or cUL or does it carry some other Canadian electrical approval?

Asked by: AdrianV
Thanks for your question, this series doesn't have any of these approvals.
Answered by: Pressure Eng
Date published: 2020-03-10

Can you also please email me the wiring schematic for this DP switch. I do not want the audible alarm if that is an option. I do want the 5A 120VAC contacts

Asked by: AdrianV
@AdrianV Thank you for contacting Omega engineering, I do not have your email to send you the wiring schematic, kindly email so that we can reply back to you. That being said it is a simple contact, no contact circuit that opens/ closes when you go above/ below your setpoint. Thank you.
Answered by: SAE JE
Date published: 2020-02-18
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