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Pressure Switches

Differential/Dual Stage

Class 9012 / Refer to Catalog 9012CT9701

 

Differential Pressure Switch

Differential pressure switches monitor the change in the difference between two pressures. Type G differential pressure switches are used in applications to signal that a predetermined pressure difference has been reached as a result of a widening or increasing difference between the two pressures. They can also signal that a predetermined pressure difference has been reached as a result of a narrowing or decreasing difference between the two pressures.

 

Table 22.5:

NEMA 4, 4X, 13 EnclosuresUL Listed and CSA Certified As Industrial Control Equipment a

Working Pressure Range on Decreasing X (upper) Actuator	Adjustable Difference on Decreasing Pressure (adds to working pressure) Y (lower) Actuator	Adjustable Differential Actuates on Increasing Pressure (adds to adjustable difference)	Maximum Allowable Pressure psi	Single Pole Double Throw		Double Pole Double Throw
				Type	$ Price	Type	$ Price
Diaphragm Actuated—Nitrile (Buna-N) Diaphragm, Zinc Plated Steel Housing
0–75	0.25–10	0.8–2	100	GGW1	596.00	GGW21	633.00
0–175	0.5–36	5–15	240	GGW4	525.00	GGW24	566.00
0–500	3–175	22–90	850	GHW1	611.00	GHW21	651.00
Piston Actuated—#440 Stainless Steel Piston. #303 Stainless Steel Housing Fluorocarbon (VITON®) Diaphragm and O-Ring. TEFLON® Retaining Ring.
0–5000	15–825	80–200	7500	GJW1	1131.00	GJW21	1172.00

Dual Stage Pressure Switch

Type G dual stage pressure switches are designed for use in applications where two separate pressure operations must be controlled by a single pressure monitoring device. These controls are most commonly used where dual functions are required or in sequencing applications such as alarm, followed by shutdown.

 

Table 22.6:

Dual Stage Pressure Switch NEMA 4, 4X, 13 EnclosureUL Listed and CSA Certified As Industrial Control Equipmenta

Range Setting Limits of Pressure Between Which Stage 1 can be Adjusted to Operate on Decreasing Pressure	Add Adjustable Spread to Range Setting to Obtain Decreasing Operating Point of Stage 2	Fixed Differential—Add to Low (decreasing) Operating Point to Obtain Approximate High (rising) Operating Point of Each Stage		Maximum Allowable Pressure psi	SPDT each Stage	$ Price
		Stage 1	Stage 2		Type
Diaphragm Actuated—Nitrile (Buna-N) Diaphragm, Zinc Plated Steel Housing
.2–10	1–5	1.0 ±0.2	1.5 ±0.4	100	GKW1	423.00
1–40	4–20	4.0 ±1.0	6.0 ±1.5	100	GKW2	386.00
1.5–75	6–30	5.0 ±1.5	8.0 ±2.0	240	GKW4	386.00
3–150	12–75	8.0 ±2.0	12 ±3	475	GKW5	378.00
5–250	22–110	14 ±3	21 ±5	750	GKW6	378.00
13–425	40–180	20 ±4	30 ±7.5	850	GLW1	393.00
20–675	45–250	30 ±6	45 ±11	2000	GLW2	393.00
Piston Actuated—#400 Stainless Steel Piston. #300 Stainless Steel Housing. Fluorocarbon (VITON ) Diaphragm and O-Ring. TEFLON Retaining Ring.
20–1000	50–300	50 ±10	75 ±19	10000	GMW1	515.00
90–2900	140–800	140 ±30	210 ±52	15000	GMW2	515.00
170–5600	300–1700	275 ±60	400 ±100	20000	GMW3	515.00
270–9000	500–2500	400 ±80	800 ±150	25000	GMW4	515.00

a	UL Listed for use in Class II, Division 2, Group G and Class III hazardous locations. Also, UL Marine Listed for use on vessels greater than 65 feet long where ignition protection is not required.

 

	File	E12443	CCN	NOWT		File	LR25490	Class	3211-03
	File	E12433	CCN	NTHT - (marine use)

Ordering Information Required:

 

1.	Specify Class 9012 Type...and indicate the high or low operating point for each stage within the limits shown in the above table.
	EXAMPLE:
		Class 9012 Type GKW4
		Set:	Stage 1 at 30 psi decreasing pressure
			Stage 2 at 50 psi decreasing pressure
			(20 psi spread)
	Differential of each stage will be approximately as shown in the table above.
2.	For available modifications see page 22-4. If one or more of these modifications are desired, add the appropriate Form to the Class and Type. Arrange form letters in alphabetical order when ordering more than one modification.

 

CP1	Discount Schedule

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Related Topics

Electrical Rating page 22-15

Temperature Rating page 22-15

Modifications page 22-4

Accessories page 22-20

Replacement Parts Kits page 22-21