Dwyer Instruments SERIES CX Catalog Page
Series
.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
PRESSURE
Compressor Pressure Switch
Adjustable Set Point and Deadband, 20 Amp Rating
Single Pressure Switches
CX-1
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 are perfect for 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.
Model
CX-11
CX-12
CX-13
CX-41
CX-42
CX-43
Number
of Ports
1
1
1
4
4
4
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)
CX-4
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)
CX-1 CX-4
SPECIFICATIONS
Service: Air and non-combustible
compatible gases.
Wetted Materials: NBR (NitrileButadiene) 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: 20 A @ 120 VAC,
12 A @ 240 VAC, 9.6 A @ 240 VAC (3
phase), 8.6 A @ 32 VDC, 3.1 A @ 120
VDC, 1.6 A @ 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 Approvals: CE.
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