Danfoss CS Data sheet
Data Sheet
Pressure switch
Type CS
For air compressors and water boosters
CS pressure switches have a built-in pressure operated, three-pole switch. The contact position of which depends on the pressure in the connector and the range setting and adjustable differential.
The pressure switches are fitted with a manual switch that will lock the contact system in the open position independently of the pressure in the system. Pressure switches with relief valve is used in compressed air systems where pressure relief on the compressor piston before start is required.
The CS is suited for automatic start and stop of air compressors and water boosters.
Features:
• Pressure ranges 2 – 20 bar
• Pressure connection G ½ or G ¼
• Contact system 3-pole (TPST) as standard available also as an accessory
• Adjustable differential
• Relief valve as accessory
• Manual switch to lock the contact system
• Enclosure IP43 or IP55
• Special versions with pressure connection made of polyacetal suitable in drinking water applications
AI239086444789en-000701
Pressure switch, Type CS
Function
Figure 1: Design and function
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Slide ring |
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Self-tapping screw |
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Diaphragm |
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Earth screw |
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Manual switch |
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Flange, G ¼ or G ½ |
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Cover screw |
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Base |
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Cap |
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Cover |
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Grubscrew |
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Differential arm |
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Spindle |
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Stop pressure screw |
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Tension spring |
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Toggle arm |
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Pressure pad |
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Differential pressure screw |
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Snap spring |
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Spring retainer |
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Bracket |
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Snap arm |
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Compression spring |
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Switch housing assy |
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Pressure shoe |
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The pressure switch is built up of the following main elements: connector, diaphragm, snap system, main spring, differential spring and a 3-pole or one-pole contact system. The stop pressure must be set on the main spring and the difference between start and stop pressures on the differential spring.
Pressure from the controlled system is led, via the connector, to the diaphragm. The diaphragm converts this pressure to a mechanical movement which is transferred by the snap system to the contact system. In this way, the contact system starts or stops a compressor/pump.
© Danfoss | Climate Solutions | 2021.03 |
AI239086444789en-000701 | 2 |
Pressure switch, Type CS
Application
Table 1: Application examples
Example 1
Control of an air compressor with a CS pressure switch.
CS 
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Example 4
Control of a centrifugal pump with a CS, via an automatic star-delta switch, motor starter, or similar.
A |
CS |
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Example 2 |
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Example 3 |
Control of a compressor with a CS pressure switch |
Control of an air compressor with a CS. An EV210B 3B |
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fitted with pressure relief valve. Note the check valve |
solenoid valve is recommended where there is need |
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between pressure relief line and reservoir. |
for especially fast pressure relief. |
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A |
CS |
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CS |
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A |
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Example 5
Pressure boosting system for domestic circuits. A type
CS switch is used to start/stop the pump.
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A Motor starter or automatic start-delta switch
© Danfoss | Climate Solutions | 2021.03 |
AI239086444789en-000701 | 3 |
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