Omega Products PSW-531 User Manual
MINIATURE PRESSURE AND
VACUUM SWITCHES
Vacuum to 800 psi
PSW-500 Series
U External Pressure Scale
and Pointer for Easy
Setpoint Adjustments
U 5 A Model Switches with
High Proof Pressures
U 1 A Gold-Plated
Switches for TTL and
Dry-Contact Closures
U Stainless Steel, Sealing
Compound and/or
O-Ring Wetted Parts
PSW-523
Both shown actual size.
PSW-541
See Switch
Accessories at
omega.com for
Audible Alarms
and Relay Modules.
To Order
PRESSURE ADJUSTABLE RANGE (psig) DEADBAND REPEATABILITY MAX SYSTEM
MODELS
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 485 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 3000 5 A
PSW-532 2.0 to 42.5 2.0 to 50 0.8 to 7.5 ±2.0 3000 5 A
PSW-533 4.0 to 91 4.0 to 100 1.1 to 9.0 ±4.0 5000 5 A
PSW-534 10 to 222 10 to 250 2.2 to 28 ±10 5000 5 A
PSW-535 20 to 432 20 to 500 3.5 to 68 ±20 5000 5 A
PSW-536 50 to 700 100 to 800 20 to 100 ±40 5000 5 A
VACUUM DEADBAND REPEATABILITY PRESSURE SWITCH
MODELS
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
Exceeding these values may cause a shift in the setpoint.
*
Comes complete with operator’s manual.
Ordering Example: PSW-525, gage model switch for maximum system pressure of 500 psi.
Visit omega.com/psw-500 for Pricing and Details
DECREASING INCREASING
ADJUSTABLE RANGE (inHg)
DECREASING INCREASING
(psig) (psi) PRESSURE (psi)* SWITCH
MAX SYSTEM
(inHg) (inHg) (inHg vac/psig)*
H-15
MINIATURE HIGH-PRESSURE SWITCHES
U 500 to 6000 psi
U 1 A and 5 A Switch Models
U Heavy-Duty Overpressure Protection
PSW-560 (1 A) AND PSW-570 (5 A) SERIES
PERFORMANCE TABLE
NOMINAL
MODEL SETPOINT DEADBAND REPEATABILITY
(psi) 1 A/5 A (±psi)
PSW-561 500 70/120 25
PSW-571 1000 80/130 50
1500 90/145 75
2000 100/160 100
2500 110/180 125
PSW-562 600 113/186 45
PSW-572 1000 145/220 60
1500 190/262 85
2000 235/305 100
2500 280/345 125
3000 325/385 150
3500 364/430 175
4000 410/470 200
5000 410/470 250
PSW-563 700 177/455 65
PSW-573 1000 210/620 75
1500 247/730 85
2000 300/820 100
3000 315/980 150
4000 340/1000 200
5000 355/1110 250
6000 375/1280 300
SPECIFICATIONS
Approvals: UL (1 A 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
pressure is the max system pressure)
Wetted Parts:
PSW-520 and 540 Series:
17-7 PH SS, 303 SS and loctite #271
PSW-530 and 550 Series: 303 SS,
316 SS, Buna-N O-ring, loctite #271
PSW-560 and 570 Series: 17-7 PH
SS, 303 SS, Buna-N O-ring and
loctite #271
(PSW-530 and PSW-550: proof
PSW-562
shown actual size.
Enclosure:
Body: 303 SS
Internal Switch Housing and
Lock Ring: Zinc alloy, chromate finish
Cap: Black Valox
Dimensions:
PSW-520 and PSW-540:
65 L x 28.6 mm Dia. (2.56 x 1.13")
PSW-560 and PSW-570:
71 L x 27.8 mm Dia. (1.75 x 1.09")
Pressure Port:
Electrical Connection: 20 AWG,
3 polyvinyl-insulated, unjacketed,
300 mm (12") pigtail leads
Wiring Code (Pressure):
Red = N/C
White = N/O
Black = Common
Wiring Code (Vacuum):
Red = N/O
White = N/C
Black = Common
Weight: 113 g (4 oz); PSW-520 and
PSW-540 Series: 85 g (3 oz)
1
⁄8-27 NPT
PSW-571shown
®
actual size.
PRESSURE SWITCHES
H
To Order
MAX SYSTEM PROOF
1 A 5 A
MODEL MODEL DECREASING INCREASING (psig) (psig)
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
Exceeding these values may cause a shift in the setpoint.
*
Visit omega.com/
psw-500
SWITCH RATING
VOLTS AMPS
MAX RATING AC/DC RESISTIVE AMPS INDUCTIVE CONTACTS
1 A SPDT 115/28 1/1 1/0.5 Gold**
5 A SPDT 250/28 5/5 5/3 Silver
Use gold contacts for dry and TTL circuitry (e.g., 5 Vdc @ 50 mA or less).
**
for Pricing and Details
ADJUSTABLE RANGE (psig)
PRESSURE PRESSURE
Caution: Pressure switches are
manufactured to the highest-quality
specifications. However, because of
their economical construction, they
should be used only for applications in
which, in the event of product failure,
the risk of damage to equipment or
personnel is minimal.
H-16
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