Dwyer AP - Manual

Series AP Diaphragm Operated Pressure Switches are reliable, convenient,
compact, low-cost switches 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. These switches are
available with optional weather-proof and explosion-proof housings.
Series AP Pressure Switches with Mercury Switches
Specifications - Installation and Operating Instructions
Bulletin O6S
2-7/8
[73.03]
4-1/8
[104.78]
Ø7/8 [22.23]
CONDUIT
HOLE
2-13/32
[61.12]
(2) Ø1/4
[6.35]
MOUNTING
HOLE
1/4 NPT
4
[101.6]
3-1/8
[79.38]
ADJUSTMENT
SCREW WITH
SEALING WIRE
1-1/16 [26.99]
4-11/16 [119.06]
5-1/16 [128.59]
Ø7/8 [22.23] KNOCK-OUT HOLE
1-13/16
[46.04]
15/16
[23.81]
1-7/16
[36.51]
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 model chart.
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: 4A @ 120 VAC/DC, 2A @ 240 VAC/DC.
Snap switch: 15A @ 120 VAC, 8A @ 240VAC, 0.5A @ 120 VDC, 0.25A @ 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 model chart.
Agency Approvals: CE, UL, CSA. For FM consult factory. (Mercury switch units
are not CE approved.)
OPERATING RANGES – TYPE AP
With Snap Switch (mm w.c.), [bar]
(2) SPDT
Single SPDT Snap Switches
Max. Approx. Switch Deadband
Range Adjustable Press.
Number Range psig Low High Low High
33 10˝ vac-50 in w.c. 15 8 in w.c. 10 in w.c. 4.5 in w.c. 5 in w.c.
(250 vac-1250) [1.0] (205) (250) (127) (127)
36 1-20 psig 60 0.5 psig 1.5 psig 0.75 psig 1.5 psig
[0.07-1.4] [4.1] [0.04] [0.11] [0.05] [0.11]
37 1-30 psig 60 0.75 psig 1.5 psig 0.75 psig 1.5 psig
[0.07-2.1] [4.1] [0.05] [0.11] [0.05] [0.11]
39 10-125 psig 160 3 psig 7 psig 1.25 psig 4 psig
[0.7-8.6] [11] [0.2] [.49] [0.09] [0.3]
MERCOID DIVISION
DWYER INSTRUMENTS, INC.
P.O. BOX 258 • MICHIGAN CITY, INDIANA 46360 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
Deadband
Range
Number
33
36
37
39
OPERATING RANGES – TYPE AP & AP-41
With Mercury Switch (mm/w.c.), [bar]
Circuit
Suffix
Number
-2
-3
-88
-89
-153
-2
-3
-26
-36
-88
-89
-153
-2
-3
-26
-36
-88
-89
-153
-2
-3
-26
-36
-88
-89
-153
Switch
Action On
Press.
Increase
SPST Opens
SPST Closes
SPST Closes
SPST Opens
SPST
SPST Opens
SPST Closes
SPST Closes
SPST Opens
SPST Closes
SPST Opens
SPST
SPST Opens
SPST Closes
SPST Closes
SPST Opens
SPST Closes
SPST Opens
SPST
SPST Opens
SPST Closes
SPST Closes
SPST Opens
SPST Closes
SPST Opens
SPST
Low
8 in w.c. (205)
8 in w.c. (205)
3 in w.c. (80)
4 in w.c. (102)
5 in w.c. (127)
1.0 psig [0.07]
1.0 psig [0.07]
1.5 psig [0.10]
1.5 psig [0.10]
4 in w.c. (102)
6 in w.c. (152)
0.3 psig [0.02]
2.0 psig [0.14]
2.0 psig [0.14]
2.5 psig [0.17]
2.5 psig [0.17]
6 in w.c. (152)
8 in w.c. (205)
0.8 psig [0.06]
6 psig [0.41]
8 psig [0.55]
8 psig [0.55]
8 psig [0.55]
1.5 psig [0.10]
1.5 psig [0.10]
4 psig [0.28]
High
10˝ w.c. (250)
10˝ w.c. (250)
3 in w.c. (80)
4 in w.c. (102)
6 in w.c. (152)
2.0 psig [0.14]
2.0 psig [0.14]
2.5 psig [0.17]
2.5 psig [0.17]
8 in w.c. (205)
12˝ w.c. (305)
0.5 psig [0.03]
3.0 psig [0.21]
3.0 psig [0.21]
3.5 psig [0.24]
3.5 psig [0.24]
12 in w.c. (305)
16 in w.c. (406)
1.5 psig [0.11]
16 psig [1.10]
17 psig [1.17]
20 psig [1.38]
20 psig [1.38]
3.0 psig [0.21]
3.0 psig [0.21]
10 psig [0.69]
Approx. Switch Deadband