Large sensitive diaphragm and reliable, time proven mechanical design are combined in Series PG pressure/differential pressure switches. For use with air and other compatible gases, they feature excellent ±1% of full scale repeatability, clear easy-to-read scale and convenient external setpoint adjustment.

Application flexibility is assured by a large variety of switching options including SPST, SPDT, DPST and DPDT; opening or closing on increasing pressure, vacuum or differential. PR and PRL models add manual reset operation on increasing or decreasing pressure. Mercury switches or hermetically sealed snap switches are available where high humidity would be a problem. If vibration or other factors preclude the use of mercury, snap switches can be provided. Standard housing is NEMA-1. Optional enclosures can be supplied for weather resistant and explosion-proof requirements.

SPECIFICATIONS
Wetted Materials: Fairprene, brass, steel, and aluminum.
Temperature Limits: -10 to 180°F (-23 to 82°C).
Pressure Limit:
   Single Pressure Use on High Side:
     Sustained Pressure: 15 psig (1.0 bar).
     Surge Limit: 20 psig (1.4 bar).
   Differential Pressure Use:
     Sustained Pressure, Range P1: 2 psig (.14 bar).
     Sustained Pressure, Range P2: 10 psig (0.7 bar).
Enclosure Rating: General purpose. Weatherproof and explosion-proof optional.
Repeatability: ±1% of full range.
Switch Type: See Model Chart on "Ordering" page.
Electrical Rating: See Model Chart on "Ordering" page.
Electrical Connections: Screw type.
Conduit Connection: 7/8" (22.23 mm) hole for 1/2" (12.7 mm) conduit hub.
Process Connection: 1/2" male NPT and 1/8" female NPT used for single positive pressure or high differential pressure, 1/8" female NPT used for single vacuum or low differential pressure.
Mounting Orientation: Vertical.
Set Point Adjustment: External screw.
Weight: 4.5 lb (2 kg).
Deadband: See "Ordering" page.
Agency Approvals: UL, CSA, FM for mercury switch models. UL only on snap switch models.

DEADBANDS (mm w.c.) [bar] Approx.

SINGLE MERCURY SWITCH	RANGE P1, 1-30 IN. W.C.			RANGE P2, .5-5.0 PSID
	MINIMUM In. w.c.	MIDDLE In. w.c.	MAXIMUM In. w.c.	MINIMUM psi	MIDDLE psi	MAXIMUM psi
-2 or -3	.7 (18)	1 (25)	1.3 (33)	.11 [.008]	.16 [.011]	.25 [.018]
-2P or -3P	2 (50)	2.75 (70)	4 (102)	.31 [.022]	.44 [.031]	1.13 [.079]
-152, -153, -4 or -54	1 (25)	1.5 (38)	1.9 (48)	.13 [.009]	.25 [.018]	.38 [.027]
DOUBLE MERCURY SWITCH
-103, -127 or -156	2.5 (65)	3.5 (90)	4.5 (114)	.38 [.027]	.56 [.039]	1.25 [.088]
-105, -129, -158, -161 or -804	1.5 (33)	2 (50)	2.5 (64)	.22 [.015]	.31 [.015]	.75 [.053]
-119, -131 or -190	1.0 (25)	1.5 (38)	1.9 (48)	.13 [.009]	.25 [.018]	.38 [.027]
SINGLE SNAP SWITCH
-153	2.5 (65)	3 (80)	4 (102)	.38 [.027]	.44 [.031]	.5 [.035]
DOUBLE SNAP SWITCH
-804	.5 (12)	.6 (15)	.7 (18)	.13 [.009]	.16 [.011]	.19 [.013]