Omega Products PSW-681 User Manual
ECONOMICAL LOW-PRESSURE/
VACUUM SWITCHES
PSW-680 Series
Vacuum to 200 inH2O
All Models
See switch
accessories on page
H-48 for audible alarms
and relay modules.
$
130
⻬ Compound Range
Covers Vacuum and
Pressure in One Unit
⻬ Low Inch-of-
Water Ranges
⻬ Silver Switch Contacts
Rated for 5 A @ 250 Vac
⻬ 1 A, Gold-Plated
Contacts for TTL or
Dry Contacts
SPECIFICATIONS
Process Temp: -55 to 90°C
(-67 to 194°F); a setpoint change of up
to 2% of sensor capacity can be
anticipated when switch is used either
below -25°C (-13°F) or above 50°C
(122°F)
Repeatability: ±0.8 inH
Cycling: Not to exceed 20 cpm
Warranty: 3 years/1 million cycles
Proof Pressure/Vacuum:
±553.6 inH
Wetted Parts: Buna-N, 316 SS,
aluminum finish, loctite #271 sealing
compound
Dimensions: 58.4 D x 57.2 mm H
(2.3 x 2.25")
Pressure Port:
Electrical Connection: 300 mm (12")
pigtail leads, 20 AWG, polyvinyl
insulated
Weight: 221 g (7.8 oz)
Proof Pressure/Vacuum:
15 psi, -5.4 psi or 11 inHg vac
O (±20 psi)
2
1
⁄8-27 MNPT
O
2
PSW-681, $130,
shown actual size.
Newnes Engineering Science Pocket Book,EE-2663, $37.
Recommended Reference Book:
Visit omega.com/bobi for Additional Books
AVAILABLE FOR FAST DELIVERY!
To Order (Specify Model Number)
MODEL NO. PRICE DECREASING INCREASING UNITS PRES
Compound Range (Units = inH2O )
PSW-681 $130
PSW-685 130
Exceeding these values may cause a shift in the setpoint.
*
Comes complete with instruction sheet.
Ordering Example: PSW-685, pressure/vacuum switch with the ranges shown above and
5 A switch contact, $130.
H-17
ADJUSTABLE RANGE MAX
2.75 to 200 2.75 to 200
6.8 to 100 5.4 to 100
pressure
vacuum psi
2O ±20
inH
inH
2O ±20
psi
*
SWITCH
1 A
5 A
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