Series A6 Durable Pressure Switch
A-439
2
[50.8]
ø1-1/2
[ø38.1]
2-7/16
[62]
3X #8-32 SCREW TERMINALS
ø1.500
[ø38.1]
1/4˝ MNPT
A-440
2-5/16
[58.74]
ø1-1/2
[ø38.1]
A
ø1.500
[ø38.1]
Specifications - Installation and Operating Instructions
Bulletin IN-A6
A-439
Series A6 Durable Pressure Switches have been specifically designed to stand
up to extended duty applications. These switches are constructed with a polyimide
film diaphragm and are compatible with a variety of fluids. For ease of installation,
the switches come with a 1/4˝ male NPT process connection and can be mounted
in any orientation. The Series A6 pressure switches are compact and have great
setpoint integrity, and feature simple, easy set-point field adjustment.
INSTALLATION/MOUNTING
The switch can be mounted in any position. Do not twist the case when installing.
Note: National Pipe Thread (NPT) when mated may contain slight gaps between
the major and minor diameter of the threads therefor plumbing tape or a
compatible sealing agent must be used on the brass fittings to ensure proper
sealing and avoid leaking.
Model
A6-151221
A6-251221
A6-351221
A6-451221
A6-551221
A6-651221
A6-751221
A6-851221
A6-153221
A6-253221
A6-353221
A6-453221
A6-553221
A6-653221
A6-753221
A6-853221
Model
A-439
A-440
©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 12/14 FR# 443563-00 Rev. 3
MERCOID DIVISION
DWYER INSTRUMENTS, INC.
Find Quality Products Online at: sales@GlobalTestSupply.com
NC
0.5 to 1 (0.03 to 0.07)
1.1 to 3 (0.08 to 0.21)
3.1 to 7 (0.21 to 0.48)
8 to 13 (0.55 to 0.90)
14 to 24 (0.97 to 1.66)
25 to 50 (1.73 to 3.45)
51 to 90 (3.52 to 6.21)
91 to 150 (6.28 to 10.35)
0.5 to 1 (0.03 to 0.07)
1.1 to 3 (0.08 to 0.21)
3.1 to 7 (0.21 to 0.48)
8 to 13 (0.55 to 0.90)
14 to 24 (0.97 to 1.66)
25 to 50 (1.73 to 3.45)
51 to 90 (3.52 to 6.21)
91 to 150 (6.28 to 10.35)
Description
Weatherproof IP65 Cover
Weatherproof IP65 w/ Fly-wire holes
Set Point Range psi (bar)
NO
1.1 to 3.1 (0.08-0.21)
2.27 to 6.05 (0.16-0.42)
4.22 to 10.75 (0.29 to 0.74)
12.3 to 17.5 (0.85 to 1.21)
18.6 to 31.8 (1.28 to 2.19)
33.1 to 61 (2.28 to 4.21)
65.6 to 112.3 (4.53 to 7.75)
114.7 to 198.3 (7.94 to 13.68)
1.1 to 3.1 (0.08-0.21)
2.27 to 6.05 (0.16-0.42)
4.22 to 10.75 (0.29 to 0.74)
12.3 to 17.5 (0.85 to 1.21)
18.6 to 31.8 (1.28 to 2.19)
33.1 to 61 (2.28 to 4.21)
65.6 to 112.3 (4.53 to 7.75)
114.7 to 198.3 (7.94 to 13.68)
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A-440
Base
Material
Brass
Brass
Brass
Brass
Brass
Brass
Brass
Brass
304 SS
304 SS
304 SS
304 SS
304 SS
304 SS
304 SS
304 SS
SPECIFICATIONS
Service: Air, motor oils, transmission
oils, jet fuels, and similar hydrocarbon
media. (Not for water use).
Wetted Materials: Base: 304 SS;
Diaphragm: Polyimide film.
Temperature Limits: -40 to 248°F
(-40 to 120°C).
Pressure Limits: Operating Pressure:
150 psi (10.3 bar) for 0.5-24 psi set
point ranges, 250 psi (17.2 bar) for 25150 psi set-point ranges; Proof
Pressure: 500 psi (34.5 bar); Burst
Pressure: 750 psi (51.7 bar) for 0.5-24
psi set point ranges, 1250 psi (86.2
bar) for 25-150 psi set-point ranges.
Enclosure Rating: General purpose
or with cover: IP65 - weatherproof.
SETPOINT ADJUSTMENT
Setpoint is field adjustable within the range. In order to adjust setpoint remove
black plastic cover to expose the setpoint adjustment screw as indicated in the
figure below. Adjust top screw to change setpoint. Clockwise to increase setpoint
and counterclockwise to decrease setpoint.
Adjustment Screw
WIRING
All wiring must conform to the National Electrical Code and local regulations. Do
not install the control to handle loads in excess of the electrical rating shown in the
specifications. The terminals are labeled on the switch itself.
CAUTION
switch. Use the control only with compatible medias.
MAINTENANCE
Upon final installation of the Series A6 Durable Pressure Switch, no routine
maintenance is required. A periodic check of the system calibration is
recommended. The Series A6 is not field serviceable and should be returned if
repair is needed (field repair should not be attempted and may void warranty). Be
sure to include a brief description of the problem plus any relevant application
notes. Contact customer service to receive a return good authorization number
before shipping.
No lubrication or periodic servicing is required. Mount the
control securely. Never exceed the electrical rating for the
Repeatability: ±10% of set-point.
Set Point Tolerance: ±15% of range.
Switch Type: 1 SPST NO, 1 SPST
NC. NO and NC switch independent
from each other.
Electrical Ratings: Resistive: 15 A @
6 VDC, 8 A @ 12 VDC, 4 A @ 24
VDC; Inductive: 1 A @ 120 VAC, 0.5 A
@ 240 VAC.
Electrical Connections: #8-32 screw
terminals.
Process Connection: 1/4˝ NPT male.
Mounting Orientation: Switch can be
installed in any position.
Set-point Adjustment: Screw.
Agency Approval: CE.
Weight: 0.13 lb (0.06 kg).
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