Series AP Diaphragm Operated Pressure Switches

Diaphragm Operated Pressure Switches
Visible Setpoint Adjustment, Compact

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
EXAMPLEAP41153 36 AP-41-153-36, Diaphragm operated pressure switch, range 1 to 20 psig (.07 to 1.4 bar), SPDT mercury switch
MODELAP
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
   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

 

CODECIRCUIT SUFFIX NO.
AC CAPACITY
DC CAPACITY
HORSEPOWER
120V
240V
440V
120V
240V
AC
DC
P-2, -3
10A
5A
3A
10A
5A
3/4
1/3
R-26, -3617A 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
 
 
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.)
  • Explosion-proof and weatherproof housing provides device protection for outdoor use or harsh environment operation
  • External switch set point adjustment reduces set-up time