OEM Mechanical Pressure Switch with Relay or Alarm
0.8 to 30 psi, fixed deadband
Volume discounts available
Volume Discount Schedule
| Quantity | Price each |
|---|---|
| 1-24 | $145.00 |
| 25-49 | $137.75 |
| 50-99 | $134.85 |
| 100-199 | $129.05 |
| 200+ | $126.15 |
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- External Pressure Scale and Pointer for Easy Setpoint Adjustments
- 5 Amp Model Switches With High Proof Pressures
- 1 Amp Gold-Plated Switches for TTL and Dry Contact Closures
- Wetted Parts: Stainless Steel, Sealing Compound and or O-ring
- Control Optional Audible Alarms or Relay Modules
PSW-521 Model Options
View all modelsEdit 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.
Switch Type
Pressure Range
Pressure Type
Deadband Range
Features
Pressure Port Size
Pressure Port Type
Deadband
- Accuracy Piston (PSW-520 and PSW-540 diaphragm)
- Maximum Rating 1
- Pressure Type Gauge
- Pressure Units PSIG
- repeatability +/-0.6 to +/-10psig
Capable of sensing very low positive or negative pressures, reliability and long life are inherent advantages of this design. Extremely easy set point adjustment: 1) Loosen the lock ring, 2) Turn interface either left or right until pointer is at the desire pressure or vacuum on range label, 3) Retighten the lock ring, and 4) Verify the adjustment by applying pressure or vacuum. See Switch Accessories at omega.com for Audible Alarms and Relay Modules.
| PRESSURE MODELS | ADJUSTABLE RANGE (psig) | DEADBAND (psig) | REPEATABILITY (psi) | MAX SYSTEM PRESSURE (psi) | SWITCH | |
|---|---|---|---|---|---|---|
| DECREASING | INCREASING | |||||
| PSW-521 | 0.8 to 28.5 | 1.6 to 30 | 0.8 to 1.3 | ±0.6 | 30 | 1 A |
| PSW-522 | 2.0 to 38.3 | 3.0 to 40 | 1.0 to 1.7 | ±1.0 | 50 | 1 A |
| PSW-523 | 3.0 to 96.5 | 4.5 to 100 | 1.5 to 3.5 | ±2.0 | 100 | 1 A |
| PSW-524 | 7.5 to 242.5 | 9.7 to 250 | 2.2 to 9.0 | ±5.0 | 250 | 1 A |
| PSW-525 | 15 to 458 | 20 to 500 | 5.0 to 21 | ±10 | 500 | 1 A |
| PSW-531 | 0.8 to 16.3 | 1.2 to 20 | 0.6 to 3.7 | ±0.8 | 3,000 | 5 A |
| PSW-532 | 2.0 to 42.5 | 2.0 to 50 | 0.8 to 7.5 | ±2.0 | 3,000 | 5 A |
| PSW-533 | 4.0 to 91 | 4.0 to 100 | 1.1 to 9.0 | ±4.0 | 5,000 | 5 A |
| PSW-534 | 10 to 222 | 10 to 250 | 2.2 to 28 | ±10 | 5,000 | 5 A |
| PSW-535 | 20 to 432 | 20 to 500 | 3.5 to 68 | ±20 | 5,000 | 5 A |
| PSW-536 | 50 to 700 | 100 to 800 | 20 to 100 | ±40 | 5,000 | 5 A |
| VACUUM MODELS | ADJUSTABLE RANGE (inHg) | DEADBAND (inHg) | REPEATABILITY (inHg) | MAX SYSTEM PRESSURE (inHg/psi) | SWITCH | |
| DECREASING | INCREASING | |||||
| PSW-541 | 1.6 to 27.0 | 2.7 to 28.2 | 1.3 to 2.7 | ±1.2 | 29.9/0 | 1 A |
| PSW-542 | 4.0 to 24.8 | 5.1 to 28.2 | 1.5 to 3.2 | ±2.0 | 29.9/0 | 1 A |
| PSW-543 | 6.0 to 21.5 | 8.4 to 28.2 | 2.0 to 7.3 | ±4.0 | 29.9/0 | 1 A |
| PSW-551 | 1.2 to 22.5 | 1.6 to 28.2 | 1.1 to 5.7 | ±1.6 | 29.9/3000 | 5 A |
| PSW-552 | 1.2 to 21.8 | 8.0 to 28.2 | 8.0 to 6.4 | ±8.0 | 29.9/5000 | 5 A |
PSW-560 (1-AMP) AND PSW-570 (5-AMP) SERIES PERFORMANCE TABLE
| MODEL | NOMINAL SETPOINT (PSI) | DEAD BAND 1 AMP/5AMP | REPEATABILITY (±PSI) |
| PSW-561 PSW-571 | 500 1000 1500 2000 2500 | 70/120 80/130 90/145 100/160 110/180 | 25 50 75 100 125 |
|---|---|---|---|
| PSW-562 PSW-572 | 600 1000 1500 2000 2500 3000 3500 4000 5000 | 113/186 145/220 190/262 235/305 280/345 325/385 364/430 410/470 410/470 | 45 60 85 100 125 150 175 200 250 |
| PSW-563 PSW-573 | 700 1000 1500 2000 3000 4000 5000 6000 | 177/455 210/620 247/730 300/820 315/980 340/1000 355/1110 375/1280 | 65 75 85 100 150 200 250 300 |
| 1 AMP MODEL | 5 AMP MODEL | ADJUSTABLE RANGE (psig) | MAX. SYSTEM PRESSURE (psig) | PROOF PRESSURE (psig) | |
| DECREASING | INCREASING | ||||
| PSW-561 | PSW-571 | 500 to 2390 | 500 to 2500 | 3000 | 4500 |
|---|---|---|---|---|---|
| PSW-562 | PSW-572 | 600 to 4500 | 600 to 5000 | 5000 | 7500 |
| PSW-563 | PSW-573 | 700 to 5500 | 700 to 6000 | 6000 | 9000 |
SWITCH RATING
| MAX. RATING | AC/DC | VOLTS RESISTIVE | AMPS | AMPS INDUCTIVE CONTACTS |
| 1 AMP SPDT | 115/28 | 1/1 | 1/0.5 | Gold** |
| 5 AMP SPDT | 250/28 | 5/5 | 5/3 | Silver |
SPECIFICATIONS
Approvals: UL (1 Amp switches PSW-520 and PSW-540 Series only)
Process Temp: -55 to 105°C (-65 to 221°F) (2% setpoint shift can occur below -25°C [-13°F] or above 50°C [122°F])
Cycling: Not to exceed 20 cycles/min.
Warranty: 3 year/1 million cycles
Sensor: Piston (PSW-520 and PSW-540 diaphragm)
Proof Pressure: 150% max. system pressure (PSW-530 and PSW-550 proof pressure is the max. system pressure)
Wetted Parts:
PSW-520 and PSW-540 Series: 17-7 pH SS, 303 SS and loctite sealing compound #271
PSW-530 and PSW-550 Series: 303 SS, 316 SS, Buna-N O-ring, loctite #271
PSW-560 and PSW-570 Series: 17-7 PH SS, 303SS, Buna-N O-ring, and loctite #271
Enclosure:
Body: 303 SS
Internal Switch Housing and Lock Ring: zinc alloy with chromate finish
Cap: black valox
Dimensions:
PSW-520 and PSW-540: 66 L x 28 dia. mm (2.6 L x 1.06' dia.)
PSW-560 and PSW-570: 71 L x 28 mm dia. (2.8 L x 1.10' dia.)
Pressure Port: 1/8 -27 NPT
Electrical Connection: 20 AWG, three polyvinyl insulated, unjacketed, 300 mm (12') pigtail leads
Wiring Code: Black is common, white is N.O., red is NC (Vacuum models: red is NO, white is NC)
Weight: 113 g (4 oz); PSW-520 and PSW-540 series, 85 g (3 oz)
Caution: Pressure switches are manufactured to the highest quality specifications. However, due to their economical construction, they should be used only for applications where, in the event of product failure, the risk of damage to equipment or personnel is minimal
Rated 5 out of
5
by
Jtwoods4 from
Works as advertised
I purchased this miniature presser switch to use in my racecar to trigger my Accusump. It works as advertised.
Date published: 2016-12-31
Rated 5 out of
5
by
ARPC from
It worked. Good quality.
Easy to install. Fixed the problem. Got here sooner than expected.
Date published: 2021-08-23
Rated 5 out of
5
by
paul s from
Excellent quality
We have been using these for years in a pump to activate a dialer when pressure drops. Very reliable. Some have been installed for many years. Good quality
Date published: 2020-11-12
Rated 5 out of
5
by
Doug at Defiant from
rugged and compact vacuum switch
I am using this with a vacuum and it switches at a very repeatable setpoint. Seems dependable and easy to adjust with a vacuum gauge to monitor the trigger point.
Date published: 2018-10-26
Rated 5 out of
5
by
cdmaster from
Vacuum switch
Very simple to use, works great! Easy to order, and great documentation.
Date published: 2018-09-17
RoHS 2015/863 - View Certificate
CE Approved
UKCA
UL cULus Recognized
Hello howdo i adjust the range of a PSW-535 to open at 450psi and close at 250 psi. thank you
There is no way to adjust the reset point (deadband) on a PSW-500 Series Pressure Switich. The deadband varies with the main setpoint setting. If your main setpoint up around 500 psi the switch will reset around 68 psi below the main setpoint at about 432 PSI.
Date published: 2020-06-09
What is the size of the threaded connection port
Thank you for your inquire, the pressure port size 1/8”NPT
Date published: 2021-09-28
