Visible Setpoint Adjustment, Compact

Reliable and convenient, SERIES AP pressure switch is a compact for instrument air or other low pressure applications. Visible set point and external adjustment add convenience. Used on air, non-corrosive gas or liquid service compatible with wetted parts. Unit also available in weatherproof and explosion-proof housing.

Product Applications

Low pressure applications
Instrument air

More Information

Model Chart

EXAMPLE	AP	41	153		36		AP-41-153-36, Diaphragm operated pressure switch, range 1 to 20 psig (.07 to 1.4 bar), SPDT mercury switch
MODEL	AP APS APR APF APH APW APWT						General Purpose Enclosure, NEMA 1 No Enclosure Manual Reset, NEMA 1 Factory Mutual Approved (153-37, 7021-153-37 only) Explosion-proof Enclosure, NEMA 7, 9 Weatherproof Enclosure with Drain (NEMA 2, 3R) Weatherproof Enclosure (NEMA 4)
CONSTRUCTION		41 7021 8021 7041 8041					Mercury Switch, Plated Steel Pressure Port, Buna-N Diaphragm Mercury Switch, 316SS Pressure Port, Buna-N Diaphragm Snap Switch, Plated Steel Pressure Port, Buna-N Diaphragm (153, 804 only) Snap Switch, Plated Steel Pressure Port, Buna-N Diaphragm, 440V (153 only) Snap Switch, 316SS Pressure Port, PTFE Diaphragm (153, 804 only) Snap Switch, 316SS Pressure Port, PTFE Diaphragm, 440V (153 only)
CIRCUIT			2 3 26 36 88 89 152 153 804				2 Circuit 3 Circuit 26 Circuit 36 Circuit 88 Circuit 89 Circuit 152 Circuit 153 Circuit 804 Circuit
CIRCUIT				L U			APR Manual Reset Increasing (2, 3, 26, 36, 153 only) APR Manual Reset Decreasing (2, 3, 26, 36, 153 only)
RANGE					33 36 37 39		-10 to 50” w.c. * 1 to 20 psig 1 to 30 psig 10-125 psig
OPTIONS						ATR ATW STR STW PT BKT BREATHER DRAIN JCT PRESET QS3	Aluminum Tag (Riveted) Aluminum Tag (Wired) Stainless Steel Tag (Riveted) Stainless Steel Tag (Wired) Paper Tag 135-95 Mounting Bracket Breather * Drain Junction Box Preset and Pressure Check Set Point QS3 Control Certification

Note: *(1) APH with 33 range must have breather.

**See Electrical Rating Chart below.

ELECTRICAL RATING MERCURY SWITCH

CODE	CIRCUIT SUFFIX NO.	AC CAPACITY			DC CAPACITY		HORSEPOWER
CODE	CIRCUIT SUFFIX NO.	120V	240V	440V	120V	240V	AC	DC
P	-2, -3	10A	5A	3A	10A	5A	3/4	1/3
R	-26, -36	17A at 120/240/277 VAC, Resistive balance same as above.
S	-153	4A	2A	NA	4A	2A	1/8	NA
T	-88, -89	0.5A	0.25A	NA	0.25A	0.125A

Specifications

Wetted Materials: Nylon reinforced Buna-N and steel. PTFE and 316 SS optional.
Temperature Limits: -30 to 150°F (-35 to 66°C).
Pressure Limit: See Catalog page.
Enclosure Rating: General purpose. Weatherproof and explosion-proof optional.
Switch Type: SPDT mercury switch or SPDT snap switch. Other switch types available.
Electrical Rating: Mercury switch: 4 A @ 120 VAC/DC, 2 A @ 240 VAC/DC. Snap switch: 15 A @ 120 VAC, 8 A @ 240 VAC, 0.5 A @ 120 VDC, 0.25 A @ 240 VDC.
Electrical Connections: Screw terminal.
Conduit Connection: 7/8" (22.23 mm) hole for 1/2" (12.7 mm) conduit hub.
Process Connection: 1/4" female NPT.
Mounting Orientation: Vertical for mercury switch models, any position for snap switch models.
Set Point Adjustment: External screw.
Weight: General Purpose: 2 lb (0.9 kg).
Deadband: See Catalog page.
Agency Approvals: CE, CSA, FM, UL. For FM consult factory. (Mercury switch units are not CE approved.)

Features

Explosion-proof and weatherproof housing provides device protection for outdoor use or harsh environment operation
External switch set point adjustment reduces set-up time

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Series AP Diaphragm Operated Pressure Switches

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