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Dwyer Series CX

Compressor Pressure Switch
Adjustable Set Point and Deadband, 20 Amp Rating
 

Series CXThe 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.

  • For control of small electrically driven air compressors
  • Contacts open on pressure rise
  • Unloader valve
  • Auto/off disconnect leaver
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 table below.
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 below.
Agency Approval: CE, UL pending.
POPULAR MODELS
Model Number Description Lead Time
 CX-11 Compressor pressure switch, 1 port, range 25-100 psig (1.7-6.9 bar), approx. adj. deadband 20-30 psig (1.4-2.1 bar), max. pressure 129 psig (8.9 bar). Normally Stocked
 CX-12 Compressor pressure switch, 1 port, range 35-150 psig (2.4-10.3 bar), approx. adj. deadband 30-40 psig (2.1-2.8 bar), max. pressure 179 psig (12.3 bar). Normally Stocked
 CX-13 Compressor pressure switch, 1 port, range 50-175 psig (3.4-12.1 bar), approx. adj. deadband 35-55 psig (2.4-3.8 bar), max. pressure 204 psig (14.1 bar). Normally Stocked
 CX-41 Compressor pressure switch, 4 ports, range 25-100 psig (1.7-6.9 bar), approx. adj. deadband 20-30 psig (1.4-2.1 bar), max. pressure 129 psig (8.9 bar). Normally Stocked
 CX-42 Compressor pressure switch, 4 ports, range 35-150 psig (2.4-10.3 bar), approx. adj. deadband 30-40 psig (2.1-2.8 bar), max. pressure 179 psig (12.3 bar). Normally Stocked
 CX-43 Compressor pressure switch, 4 ports, range 50-175 psig (3.4-12.1 bar), approx. adj. deadband 35-55 psig (2.4-3.8 bar), max. pressure 204 psig (14.1 bar). Normally Stocked