Page 1
31.8 (1.25)
DIA.
ADJUSTMENT
ACCESS COVER .
SLIDE UP
TO OPEN.
34.9 (1.38)
FACTORY-SEALED
LEAD WIRES
46 (1.8) LONG
1
/2 NPT (ST/ST)
72.9 (2.88)
15.9 (0.62)
1
/4 NPT (ST/ST)
SLOTTED
ADJUSTMENT
SCREW.
TURN IN
TO RAISE
SETPOINT.
WIRE COLOR CODING
DPDT
SPDT SW1 SW2
COMMON
BRN BRN YEL
N.C. RED RED BLK
N.O. BLU BLU VLET
GROUND GRN GRN
COMPACT, VIBRATION-RESISTANT SWITCHES
FOR DIVISION 1 HAZARDOUS LOCATIONS
PSW12 Series
8 to 6000 psi
Rugged
Design
Starts at
$
265
⻬ Compact Stainless Steel
Construction
⻬ Belleville Technology for
Long Life, Vibration
Resistance, and Stability
⻬ Easy Field Setting and
Adjustment
⻬ SPDT Sealed Switches
⻬ Strain Relief
⻬ 1.8 m (72") Lead Wires
⻬ Mounting Bracket for
Retrofit Applications
OMEGA’S PSW12 offers reliability,
repeatability, and durability in a
compact design. This switch is rack
mountable and has an accessible
adjustment when installed. Snapaction Belleville spring design
contributes to a long, stable life
and to vibration resistance. An
optional mounting bracket provides
easy retrofit, and an optional cover
lock adds security. Ranges are from
8 to 6000 psi (0.6 to 414 bar).
SPECIFICATIONS
Approval: UL listed, cUL certified;
Class I, Div 1 and 2, Groups A, B, C, and D;
Class II, Div 1 and 2, Groups E, F, and G
Storage Temperature: -50 to 95°C
(-58 to 203°F)
Process Temperature:
Stainless Steel Diaphragm:
-17 to 160°C (0 to 320°F)
Polyimide Diaphragm: -28 to 93°C
(-20 to 200°F)
Ambient Temperature: -50 to 95°C
(-58 to 203°F); setpoint typically shifts
less than 1% of range for a 28°C (50°F)
ambient temperature change.
Shock: Setpoint repeats after 75 g,
10 ms duration
Setpoint
adjustment
with cover
open (up)
Belleville
assembly
(inside)
Vibration: Setpoint repeats after
15 g, 10 to 2000 Hz
Setpoint Repeatability: ±1% of
adjustable range
Switch Output: 1 or 2 SPDT, factory-
sealed lead wires; mechanical contact
life: 10 million cycles
Electrical Ratings: 5 A @ 250 Vac,
5 A resistive and 3 A inductive
@ 28 Vdc; silver contacts
Enclosure: 300 SS;
NEMA 4X, 7, 9 and IP66
Weight: Approximately 0.34 kg
(12 oz)
Electrical Connection:
1.8 m (72") lead wires
Pressure Connection:
1
⁄2 MNPT with
1
⁄4 FNPT
H-35
PSW12T-BS, $265,
shown actual size.
Dimensions:
mm (in)
Page 2
PSW12T-CS, $265,
shown smaller than
actual size.
COMPACT SWITCHES
See switch
accessories on page
H-37 for audible alarms
and relay modules.
MOST POPULAR MODELS HIGHLIGHTED!
To Order (Specify Model Number)
ADJUSTABLE RANGE DEADBAND
FALL/LOW RISE/HIGH LOW HIGH
MODEL
1
BUNA N O-RING,
NO.
FNPT 316 SS PRESSURE CONNECTION, PFA-COATED POLYIMIDE (KAPTON
⁄
4
PRICE
1
" ORIFICE, SINGLE 5 A SPDT SWITCH
⁄
8
psi bar psi bar psi bar psi bar psi bar psi bar
®
) DIAPHRAGM,
PSW12T-AS $265 8 0.6 30 2.1 2 0.1 6 0.4 600 41 1000 69 Single
PSW12T-BS 265 15 1.0 55 3.8 3 0.2 8 0.6 600 41 1000 69 Single
PSW12T-CS 265 30 2.1 170 11.7 5 0.3 15 1.0 600 41 1000 69 Single
PSW12T-DS 265 100 6.9 370 25.5 15 1.0 50 3.4 600 41 1000 69 Single
PSW12T-ES 265 200 13.8 700 48.3 40 2.8 90 6.2 1500 103 3000 206 Single
PSW12T-FS 265 400 27.6 1500 103.0 100 6.9 250 17.2 3000 206 4500 309 Single
PSW12T-GS 265 1000 68.9 3200 220.6 100 6.9 500 34.5 6000 414 10,000 689 Single
PSW12T-HS 265 2000 137.9 6000 414.0 400 27.6 800 55.2 8000 551 10,000 689 Single
1
FNPT 316 SS PRESSURE CONNECTION AND DIAPHRAGM, FKM O-RING,
⁄
4
1
" ORIFICE, SINGLE 5 A SPDT SWITCH
⁄
8
PSW12V-AS $265 9 0.6 35 2.4 2 0.1 7 0.5 600 41 1000 69 Single
PSW12V-BS 265 25 1.7 65 4.5 3 0.2 10 0.7 600 41 1000 69 Single
PSW12V-CS 265 50 3.5 150 10.3 5 0.3 15 1.0 600 41 1000 69 Single
PSW12V-DS 265 100 6.9 350 24.1 15 1.0 50 3.4 600 41 1000 69 Single
PSW12V-ES 265 250 17.2 700 48.3 40 2.8 95 6.6 1500 103 3000 206 Single
PSW12V-FS 265 400 27.6 1500 103.0 100 6.9 300 20.7 3000 206 4500 309 Single
PSW12V-GS 265 1000 68.9 3200 220.6 100 6.9 500 34.5 6000 414 10,000 689 Single
PSW12V-HS 265 2000 137.9 6000 414.0 400 27.6 1000 69 8000 551 10,000 689 Single
1
FNPT 316 SS PRESSURE CONNECTION, PFA-COATED POLYIMIDE (KAPTON
⁄
4
BUNA-N O-RING,
1
" ORIFICE, DUAL 5 A SPDT SWITCH
⁄
8
®
) DIAPHRAGM,
PSW12T-AD $285 8 0.6 30 2.1 2 0.1 6 0.4 600 41 1000 69 Dual
PSW12T-BD 285 15 1.0 55 3.8 3 0.2 8 0.6 600 41 1000 69 Dual
PSW12T-CD 285 30 2.1 170 11.7 5 0.3 15 1.0 600 41 1000 69 Dual
PSW12T-DD 285 100 6.9 370 25.5 15 1.0 50 3.4 600 41 1000 69 Dual
PSW12T-ED 285 200 13.8 700 48.3 40 2.8 90 6.2 1500 103 3000 206 Dual
PSW12T-FD 285 400 27.6 1500 103.0 100 6.9 250 17.2 3000 206 4500 309 Dual
PSW12T-GD 285 1000 68.9 3200 220.6 100 6.9 500 34.5 6000 414 10,000 689 Dual
PSW12T-HD 285 2000 137.9 6000 414.0 400 27.6 800 55.2 8000 551 10,000 689 Dual
1
FNPT 316 SS PRESSURE CONNECTION AND DIAPHRAGM, FKM O-RING,
⁄
4
1
" ORIFICE, DUAL 5 A SPDT SWITCH
⁄
8
PSW12V-AD $300 9 0.6 35 2.4 2 0.1 7 0.5 600 41 1000 69 Dual
PSW12V-BD 300 25 1.7 65 4.5 3 0.2 10 0.7 600 41 1000 69 Dual
PSW12V-CD 300 50 3.5 150 10.3 5 0.3 15 1.0 600 41 1000 69 Dual
PSW12V-DD 300 100 6.9 350 24.1 15 1.0 50 3.4 600 41 1000 69 Dual
PSW12V-ED 300 250 17.2 700 48.3 40 2.8 95 6.6 1500 103 3000 206 Dual
PSW12V-FD 300 400 27.6 1500 103.0 100 6.9 300 20.7 3000 206 4500 309 Dual
PSW12V-GD 300 1000 68.9 3200 220.6 100 6.9 500 34.5 6000 414 10,000 689 Dual
PSW12V-HD 300 2000 137.9 6000 414.0 400 27.6 1000 69 8000 551 10,000 689 Dual
Comes complete with operator’s manual.
Note: External grounding screw must be specified with order. Add “-GND” to specified model number, and add $20 to price,
Ordering Examples: PSW12T-DS-GND, single 5 A SPDT switch with PFA-coated diaphragm and external grounding screw, $265 + 20 = $285.
PSW12V-ED, dual 5 A SPDT switch with 316 SS diaphragm and FKM O-ring, $300.
MAX WORKING
PROOF
PRESSURE PRESSURE
SWITCH
PRESSURE SWITCHES
H
ACCESSORIES
MODEL NO. PRICE DESCRIPTION
PSW12-CL $20 Cover lock
PSW12-MB 25 Mounting bracket
Recommended Reference Book:
Practical Guide to Pressure
Vessel Manufacturing,
ME-1755, $180
See Section Y For Additional Books
H-36
Page 3
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