Dwyer AP User Manual

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]

Series AP Pressure Switches with Mercury Switches

Specifications - Installation and Operating Instructions

Series AP Diaphragm Operated Pressure Switches are reliable, convenient,

compact, low-cost switches for instrument air or other low-pressure applications.

isible set point and external adjustment add convenience. Used on air, non-

V

orrosive gas or liquid service compatible with wetted parts. These switches are

c

vailable with optional weather-proof and explosion-proof housings.

a

OPERATING RANGES – TYPE AP & AP-41

With Mercury Switch (mm/w.c.), [bar]

Deadband
Range
Number

33

36

37

39

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

Approx. Switch Deadband

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]

SPECIFICATIONS

etted Materials: Nylon reinforced Buna-N and steel. PTFE and 316 SS

W

ptional.

o

emperature Limits: -30 to 150°F (-35 to 66°C).

T
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.

lectrical Rating: Mercury switch: 4A @ 120 VAC/DC, 2A @ 240 VAC/DC.

E

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]

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]

(2) SPDT

MERCOID DIVISION

DWYER INSTRUMENTS, INC.
P.O. BOX 258 • MICHIGAN CITY, INDIANA 46360 U.S.A.

Phone: [phone] www.dwyer-inst.com
Fax: [phone] e-mail: [e-mail]

Model Chart – Series AP
Example

onstruction

C

Reset Options

ousing Options

H

ircuit (Switching)

C

ptions

O

Wetted Materials

Adjustable
Pressure Ranges
& Maximum
Operating
Pressures

* See Chart below.

AP __ 153 _ 36 AP-153-36 Pressure Control, fixed deadband, automatic reset, SPDT mercury switch,

P General Purpose enclosure, NEMA-1. UL CSA

A

S Low pressure steam switch, NEMA-1, range 34 only. Circuits, 2, 3, 26, 36, 153 only. UL

A

adjustable range 1-20 psig (0.07-1.4 bar), maximum pressure 60 psig (4.1 bar)

TFE covered diaphragm, plated steel pressure port.

P

F

RUManual reset – operates on decrease automatically. NEMA-1 only. UL CSA

R

S

T Weather-proof enclosure, NEMA-4.

W
W Weather-proof enclosure with condensate drain, NEMA-2, 3R. UL CSA
H Explosion-proof enclosure, NEMA-7, 9, Class I Group, C & D; Class II Group E, F & G. UL

_2 SPST mercury switch, Electrical Code P* – opens on pressure increase. UL CSA

3 SPST mercury switch, Electrical Code P*– closes on pressure increase. UL CSA

_

26 SPST mercury switch, Electircal Code R* – closes on pressure increase. UL CSA

_

_ 36 SPST mercury switch, Electrical Code R* – opens on pressure increase. UL CSA

_ 88 SPST magnetic mercury switch, Electrical Code T* – closes on pressure increase. UL CSA
_ 89 SPST magnetic mercury switch, Electrical Code T* – opens on pressure increase.

153 SPDT mercury switch, Electrical Code S*. UL CSA

_

(   ) Other circuits available, consult factory.

_

0_ _ 153 SPDT snap acting switch, rated 15A at 120 VAC, 8A at 240 VAC, 0.5A at 120 VDC, UL CSA

7

70_ _ 804 DPDT: 2 each SPDT snap acting switches, rated 5A at 120/240 VAC, 5A at 30 VDC resistive UL CSA
80_ _ 153 SPDT snap acting switch, rated 15A at 120 VAC, 8A at 240 VAC, 4A at 480 VAC, 6A at 24 UL CSA

_ Mercury switch type. Plated steel pressure port, Buna-N diaphragm. UL CSA

_

1 Mercury switch type. 316 stainless steel pressure port, PTFE diaphragm.

4

021 Snap switch type. Plated steel pressure port, Buna-N diaphragm. UL CSA

7
8021 Snap switch type. Plated steel pressure port, Buna-N diaphragm. UL CSA
7041 Snap switch type, 316 stainless steel pressure port, PTFE diaphragm.
8041 Snap switch type, 316 stainless steel pressure port, PTFE diaphragm.

Factory Mutual approved, NEMA-1, circuit 153 only. Range 37 only. UL FM CSA
APF-153-37 or APF-7021-153-37 only.

Not available with circuit 88, 89 or snap switch type.

L Manual reset – operates on increase automatically. NEMA-1 only. UL CSA

ot available with circuit 88, 89 or snap switch type.

N
Less enclosure UL CSA

ot available with range 33.

N

Not available with range 33.

0.25A at 240 VDC, 3/4 hp at 120 VAC, 1 hp at 240 VAC.

VDC resistive, 0.5A at 120 VDC, 0.25A at 240 VAC, 3/4 hp at 120 VAC, 1.5 hp at 240 VAC.

33 Adjustable range 10˝ wc VAC –50˝ wc (250 mm VAC to 1250 mm wc), UL CSA

maximum pressure 15 psig.

34 Adjustable range 1-15 psig (0.07 to bar), AS only, maximum pressure UL CSA

30 psig (2.1 bar), maximum temperature 275°F (135°C) psig.
36 Adjustable range 1-20 psig (0.07-1.4 bar), maximum pressure 60 psig (4.1 bar) UL CSA
37 Adjustable range 1-30 psig (0.07-2.1 bar), maximum pressure 60 psig (4.1 bar). UL CSA
39 Adjustable range 10-125 psig (0.7-8.6 bar), maximum pressure 160 psig (11 bar). UL CSA

ELECTRICAL RATING MERCURY SWITCH

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

AC Capacity DC Capacity Horsepower