Owner's manual

Series CX Compressor Pressure Switch
Specifications - Installation and Operating Instructions
Bulletin IN-525
INSTALLATION/MOUNTING
The switch can be pipe mounted in any position. Do not twist the
case when installing. Use a wrench on the pressure connection
flats.
WIRING
All wiring must conform to the National Electrical Code and local
regulations. Do not install the control to handle loads in excess of
electrical rating shown in specifications or as indicated on
instructions inside control cover.
TURN
CLOCKWISE
TO INCREASE
BOTH CUT-OUT
A
ND CUT-IN
PRESSURE
TURN
CLOCKWISE
TO INCREASE
CUT-OUT
PRESSURE
WITHOUT
AFFECTING
CUT-IN
MOTOR MOTOR
LINE LINE
POWER
SUPPLY
WIRING DIAGRAM
.236
[Ø6.00]
OR
Ø.250
[Ø6.35]
3-35/64
[90]
3-45/64
[94]
2-17/64
[57.6]
3-3/8
[85.5]
Ø.236
[Ø6.00]
OR
Ø.250
[Ø6.35]
3-35/64
[90]
3-45/64
[94]
3-45/64
[94]
1-27/64
[36]
2-17/64
[57.5]
CX-1
CX-4
SPECIFICATIONS
Service: Air and non-combustible compatible gases.
Wetted Materials: NBR (Nitrile-Butadiene) rubber diaphragm,
steel connection (CX-1), aluminum alloy connection (CX-4).
Temperature Limits: 140°F (60°C).
Pressure Limits: See model chart.
Enclosure Rating: General purpose.
Repeatability: ±5 psig (±0.3 bar).
Switch Type: 2 each SPST snap action, normally closed (NC).
Electrical Ratings: 20A @ 120 VAC, 12A @ 240 VAC, 9.6A @
240 VAC (3 phase), 8.6A @ 32 VDC, 3.1A @ 120 VDC, 1.6A @
240 VDC. 1.5 HP @ 120 VAC, 2 HP @ 240 VAC, 3 HP @ 240
VAC (3 phase), 0.25 HP @ 32/120/240 VDC.
Electrical Connections: Screw terminal.
Conduit Connection: 7/8˝ hole for 1/2˝ conduit hub (2 places).
Process Connection: 1/4˝ female NPT (CX-4: 4 places).
Mounting Orientation: Switch can be installed in any position.
Setpoint Adjustment: Internal screws.
Weight: CX-1: 0.78 lb (0.35 kg); CX-4: 1.03 lb (0.47 kg).
Deadband: See model chart.
Agency Approval: CE, UL pending.
MODELS
Model
Number
CX-11
CX-12
CX-13
CX-41
CX-42
CX-43
Range
psig (bar)
25-100 (1.7-6.9)
35-150 (2.4-10.3)
50-175 (3.4-12.1)
25-100 (1.7-6.9)
35-150 (2.4-10.3)
50-175 (3.4-12.1)
Approx. Adjustable
Deadband psig (bar)
20-30 (1.4-2.1)
30-40 (2.1-2.8)
35-55 (2.4-3.8)
20-30 (1.4-2.1)
30-40 (2.1-2.8)
35-55 (2.4-3.8)
Max. Pressure
psig (bar)
129 (8.9)
179 (12.3)
204 (14.1)
129 (8.9)
179 (12.3)
204 (14.1)
CAUTION: No lubrication or periodic servicing is required. Mount
the control securely. Never exceed the electrical rating for the
switch. Use the control only with compatible medias.
MAINTENANCE
Upon final installation of the Series CX Low Cost Pressure Switch,
no routine maintenance is required. A periodic check of the system
calibration is recommended. The Series CX 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.
©Copyright 2006 Dwyer Instruments, Inc. Printed in U.S.A. 7/06 FR# R3-443460-00
MERCOID DIVISION
DWYER INSTRUMENTS, INC.
P.O. BOX 258 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone: [phone] www.dwyer-inst.com
Fax: [phone] e-mail: [e-mail]
Number
of Ports
1
1
1
4
4
4
CX-1
CX-4
The Series CX Compressor Pressure Switches are designed
with a 20 amp normally closed SPST switch for direct control of
pumps and motors. The set point and deadband are both easily
adjustable via screw terminals inside the cover. For ease of
installation, the switches come with a 1/4˝ female NPT process
connection or the optional 4-port connection block on the CX-4
models. Besides making installation easier, one of the other ports
can be used to install a pressure gage. Plus, these switches can
be mounted in any orientation.
These units can be found regulating tank pressure on small air
compressors. The CX series switches come with an unloader
valve, which prevents compressors from starting under load. They
also come with an auto/off disconnect lever for manually cutting off
the load. When the lever is in the off position, there is a test button
inside the housing that can be pushed to turn on the load.