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INDUSTRIAL
PRESSURE SWITCHES
FOR HARSH ENVIRONMENTS
PSW-200 Series
Vacuum to 1700 psi
Starts at
$
290
⻬ Rugged, One-Piece,
Epoxy-Coated
Aluminum Body
⻬ Meets NEMA 4X (IP66)
Classification
⻬ UL Listed, cUL Certified
⻬ Stainless Steel
Nameplate
⻬ Internal Reference Scale
with Adjustment Lock
⻬ Hermetically Sealed
SPDT or DPDT Switch
SPECIFICATIONS
Approvals: UL listed, cUL certified
Storage Temperature:
-54 to 71°C (-65 to 160°F)
Ambient Temperature Limits:
-40 to 71°C (-40 to 160°F), except
models PSW-234 to PSW-240 and
PSW-221 to PSW-226: -18 to 71°C
(0 to 160°F); setpoint typically shifts
less than 1% of range for a 28°C
(50°F) ambient temperature change
Process Temperature:
Stainless Steel: -57 to 204°C
(-70 to 400°F)
Phosphor Bronze: -40 to 149°C
(-40 to 300°F)
Buna-N: -23 to 93°C (-10 to 200°F)
Shock: Setpoint repeats after 15 g,
10 ms duration
Vibration: Setpoint repeats after
2.5 g, 5 to 500 Hz
Enclosure Classification:
Complies with NEMA 4X (IP66)
Setpoint Repeatability: 1% of
adjustable range, except models
PSW-241 to PSW-245D: 1.5%
Switch Output: Hermetically sealed
SPDT or DPDT switch can be wired
“normally open” or “normally closed”
Electrical Output: 11 A, 125/250 Vac
resistive
Enclosure: Die-cast aluminum,
epoxy coated, gasketed
Weight: 0.7 to 2.7 kg (1.5 to 6 lb)
(varies by model)
Electrical Connection:
and (2) 22 mm (7⁄8") diameter
knockouts
1
⁄2 NPT
PSW-236, $290,
shown smaller
than actual size.
Pressure Connection:
or 1⁄4 FNPT as noted in “To Order” chart
Dimensions:
psi Ranges:
214 max H x 101 W x 60 mm D
(8.4 max x 4 x 2.3")
inH2O Ranges: W and D = 152 mm (6")
1
⁄2 FNPT,
MOST POPULAR MODELS HIGHLIGHTED!
To Order (Specify Model Number)
ADJUSTABLE RANGE
MODEL NO. PRICE
BUNA-N DIAPHRAGM, O-RING, 1⁄4FNPT 304 SS PRESSURE CONNECTION
PSW-234 $290 3 to 20 psi 0.21 to 1.38 bar 1 to 4 psi 1000 psi
PSW-234D 335 3 to 20 psi 0.21 to 1.38 bar 3.8 psi typ. 1000 psi
PSW-236 290 3 to 100 psi 0.21 to 6.90 bar 2 to 12 psi 1000 psi
PSW-236D 335 3 to 100 psi 0.21 to 6.90 bar 11.3 psi typ. 1000 psi
PSW-238 290 15 to 500 psi 1.03 to 34.48 bar 15 to 60 psi 2500 psi
PSW-238D 335 15 to 500 psi 1.03 to 34.48 bar 26.3 psi typ. 2500 psi
PSW-240 290
PSW-240D 335
PHOSPHOR-BRONZE BELLOWS, 1⁄4FNPT NICKEL-PLATED BRASS PRESSURE CONNECTION
PSW-246D $345
STANDARD METRIC 0 TO 100 % RANGE
100 to 1700 psi
100 to 1700 psi
30 inHg vac
to 0
6.90 to 117 bar 20 to 110 psi 2500 psi
6.90 to 117 bar 93.8 psi typ. 2500 psi
-1 to 0 bar 11.3 inHg vac typ. 30 psi
DEADBAND FIXED PROOF ADDED
PRESSURE
H-29
SWITCH FEATURE
11 A SPDT
11 A DPDT
11 A SPDT
11 A DPDT
11 A SPDT
11 A DPDT
11 A SPDT
11 A DPDT
11 A DPDT
–
DPDT
SWITCH
–
DPDT
SWITCH
–
DPDT
SWITCH
–
DPDT
SWITCH
DPDT
SWITCH
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PSW-241, psi range,
$315, shown smaller
than actual size.
PRESSURE SWITCHES
See switch
See Section Y for a
Selection of Scientific,
Technical, and Reference
Books Available from
omega.com
To Order (Specify Model Number)
ADJUSTABLE RANGE DEADBAND
MODEL NO. PRICE
WELDED 316 SS DIAPHRAGM,
PSW-231 $425 1 to 20 psi 0.07 to 1.38 bar 0.1 to 3 psi 500 psi
PSW-231D 470 1 to 20 psi 0.07 to 1.38 bar 3.8 psi typ. 500 psi
PSW-232 425 2 to 50 psi
PSW-232D 470 2 to 50 psi
PSW-241 315 5 to 30 psi 0.34 to 2.07 bar 3 to 8 psi 10 psi 2500 psi
PSW-241D 360 5 to 30 psi 0.34 to 2.07 bar 9.8 psi typ. 2500 psI
PSW-242 315 10 to 100 psi 0.69 to 6.90 bar 3 to 30 psi 45 psi 2500 psi
PSW-242D 360 10 to 100 psi 0.69 to 6.90 bar 41.3 psi typ. 2500 psi
PSW-243 315 15 to 300 psi 1.03 to 20.69 bar 10 to 40 psi 60 psi 2500 psi
PSW-243D 360 15 to 300 psi 1.03 to 20.69 bar 52.5 psi typ. 2500 psi
PSW-244 315 20 to 500 psi 1.38 to 34.98 bar 15 to 45 psi 75 psi 2500 psi
PSW-244D 360 20 to 500 psi 1.38 to 34.98 bar 67.5 psi typ. 2500 psi
PSW-245D 360
BUNA-N DIAPHRAGM, O-RING WITH
PSW-221 $470
PSW-221D 515
PSW-222 470
PSW-222D 515
PSW-223 470
PSW-223D 515
PSW-224 470
PSW-225 470
PSW-225D 515
PSW-226 470
PSW-226D 515
Comes complete with operator’s manual.
Important Note Regarding DPDT Switches: DPDT switches are manufactured so that contact transfer of both switches occurs at the same
time for rising pressure setpoints. For falling pressure setpoints, a small amount of non-simultaneity in the switch outputs may be observed.
Note: Deadbands are fixed and non-adjustable and tend to increase linearly with increased setpoint.
Ordering Example: PSW-241, pressure switch 5 to 30 psi, stainless steel diaphragm, 3 to 8 psi deadband, $315.
STANDARD METRIC RANGE RANGE
80 to 1700 psi
300 vac to 0 inH2O
300 vac to 0 inH2O
10 vac to 10 inH2O -24.94 to 24.94 mbar
10 vac to 10 inH2O -24.94 to 24.94 mbar
50 vac to 50 inH2O -124.54 to 124.54 mbar
50 vac to 50 inH2O -124.54 to 124.54 mbar
0.5 to 5 inH2O
2.5 to 50 inH2O 6.23 to 124.154 mbar
2.5 to 50 inH2O 6.23 to 124.154 mbar
10 to 250 inH2O 24.91 to 622.70 mbar
10 to 250 inH2O 24.91 to 622.70 mbar
1
⁄
FNPT 316 SS PRESSURE CONNECTION
2
0.14 to 3.45 bar
0.14 to 3.45 bar
5.50 to 117 bar 168.8 psi typ. 2500 psi
1
⁄
2
-747.24 to 0 mbar
-747.24 to 0 mbar
1.25 to 12.45 mbar
accessories on page
H-37 for audible alarms
and relay modules.
MOST POPULAR MODELS HIGHLIGHTED!
0 to 75% 100%
0.1 to 5 psi 500 psi
5.3 psi typ. 500 psi
FNPT ALUMINUM PRESSURE CONNECTION
0.8 to 32 inH2O 400 psi
36 inH2O typ. 400 psi
0.4 to 2.4 inH2O 400 psi
2.7 inH2O typ. 400 psi
0.4 to 12 inH2O 400 psi
13.5 inH2O typ. 400 psi
0.4 to 1.2 inH2O 400 psi
0.4 to 3.2 inH2O 400 psi
3.6 inH2O typ. 400 psi
0.4 to 24 inH2O 400 psi
27 inH2O typ. 400 psi
H-30
PROOF
PRESSURE
ADDED
SWITCH
11 A SPDT
11 A DPDT
11 A SPDT
11 A DPDT
11 A SPDT
11 A DPDT
11 A SPDT
11 A DPDT
11 A SPDT –
11 A DPDT
11 A SPDT
11 A DPDT
11 A DPDT
11 A SPDT
11 A DPDT
11 A SPDT
11 A DPDT
11 A SPDT
11 A DPDT
11 A SPDT
11 A SPDT
11 A DPDT
11 A SPDT
11 A DPDT
FEATURE
DPDT
SWITCH
DPDT
SWITCH
DPDT
SWITCH
DPDT
SWITCH
DPDT
SWITCH
DPDT
SWITCH
DPDT
SWITCH
DPDT
SWITCH
DPDT
SWITCH
DPDT
SWITCH
DPDT
SWITCH
DPDT
SWITCH
–
–
–
–
–
–
–
–
–
–
–
PRESSURE SWITCHES
H
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