Danfoss CS Pressure switches for air and water
CS pressure switches have a three-pole switch and adjustable differential.
Whereas most pressure switches have fixed differential pressure, the Danfoss CS pressure switch features an adjustable differential, so the switch can be adjusted to suit a variety of working conditions. And the CS switch is supplied with a manual switch to lock the contact system in the open position independent of the pressure in the tank for added safety.

 

CS pressure switches
• For automatic start and stop of air compressors and water boosters
• Pressure ranges: 2 to 20 bar
• Contact system: 3-pole (standard) and 1-pole (accessory)
• Adjustable differential
• Manual switch to lock the contact system
• Relief valve (accessory)
• Enclosure IP43 or IP55
• Also available with DVGW (KTW) drinking water approval

CS, Pressure switches for air and water
Code no. Type Regul. range [bar] Pe Diff. @ Min. range setting [b] Diff. @ Max. range setting [b] Max. working pressure [bar] Pe Pressure conn. Contact function Encl.
031E020066 CS 2,00 - 6,00 bar 0.72 - 1.0 bar 1.0 - 2.0 bar 6,0 bar G 1/4 TPST IP43
031E020266 CS 2,00 - 6,00 bar 0.72 - 1.0 bar 1.0 - 2.0 bar 6,0 bar G 1/4 SPST IP43
031E020566 CS 2,00 - 6,00 bar 0.72 - 1.0 bar 1.0 - 2.0 bar 6,0 bar G 1/4 TPST IP55
031E021066 CS 2,00 - 6,00 bar 0.72 - 1.0 bar 1.0 - 2.0 bar 6,0 bar G 1/2 TPST IP43
031E021566 CS 2,00 - 6,00 bar 0.72 - 1.0 bar 1.0 - 2.0 bar 6,0 bar G 1/2 TPST IP55
031E022066 CS 4,00 - 12,00 bar 1.0 - 1.5 bar 2.0 - 4.0 bar 12,0 bar G 1/4 TPST IP43
031E022566 CS 4,00 - 12,00 bar 1.0 - 1.5 bar 2.0 - 4.0 bar 12,0 bar G 1/4 TPST IP55
031E023066 CS 4,00 - 12,00 bar 1.0 - 1.5 bar 2.0 - 4.0 bar 12,0 bar G 1/2 TPST IP43
031E023566 CS 4,00 - 12,00 bar 1.0 - 1.5 bar 2.0 - 4.0 bar 12,0 bar G 1/2 TPST IP55
031E024066 CS 7,00 - 20,00 bar 2.0 - 3.5 bar 3.5 - 7.0 bar 20,0 bar G 1/4 TPST IP43
031E024566 CS 7,00 - 20,00 bar 2.0 - 3.5 bar 3.5 - 7.0 bar 20,0 bar G 1/4 TPST IP55
031E025066 CS 7,00 - 20,00 bar 2.0 - 3.5 bar 3.5 - 7.0 bar 20,0 bar G 1/2 TPST IP43
031E025566 CS 7,00 - 20,00 bar 2.0 - 3.5 bar 3.5 - 7.0 bar 20,0 bar G 1/2 TPST IP55
031E026566 CS 2,00 - 6,00 bar 0.72 - 1.0 bar 1.0 - 2.0 bar 6,0 bar G 1/2 TPST IP55
031E027166 CS 4,00 - 12,00 bar 1.0 - 1.5 bar 2.0 - 4.0 bar 12,0 bar G 1/2 TPST IP43
031E101066 CS 2,00 - 6,00 bar 0.72 - 1.0 bar 1.0 - 2.0 bar 6,0 bar G 1/2 TPST IP43
031E101266 CS 4,00 - 12,00 bar 1.0 - 1.5 bar 2.0 - 4.0 bar 12,0 bar G 1/2 TPST IP43
031E101466 CS 7,00 - 20,00 bar 2.0 - 3.5 bar 3.5 - 7.0 bar 20,0 bar G 1/2 TPST IP43
031E218866 CS 2,00 - 6,00 bar 0.72 - 1.0 bar 1.0 - 2.0 bar 6,0 bar G 1/2 TPST IP43
031E219166 CS 2,00 - 6,00 bar 0.72 - 1.0 bar 1.0 - 2.0 bar 6,0 bar G 1/2 TPST IP43
 

 

Pressure switches types PS and PSU
** OBSOLETE replaced by CS range- Table for pressure reference only ***
Types PS and PSU were pressure controlled three-pole switches. The position of the contacts depended on the pressure in the inlet connection and the range setting.
Pressure switch type PS was for the automatic stop and start of motors in compressed air and water pressure plant (pressure storage tanks).
Type PSU were especially for compressed air plant where pressure over the compressor piston must be relieved before re starting.

Pressure switches types PS and PSU
Code number Type Regul. range [bar] Pe Conn. size Diff. min. range setting [bar] Diff. max. range setting [bar] Max. working pressure [bar] Pe With unloader valve Without unloader valve
031E0171 PS4B 1 – 4 bar G 1/2 A 0.6 – 0.7 bar 3 20 bar   X
031E0172 PSU4B 1 – 4 bar G 1/2 A 0.6 – 0.7 bar 3 20 bar X  
031E0182 PS7B 1 – 7 bar G 1/2 A 0.95 – 1.3 bar 3 20 bar   X
031E0175 PS9B 2.5 – 9.5 bar G 1/2 A 1.2 – 1.8 bar 7 25 bar   X
031E0176 PSU9B 2.5 – 9.5 bar G 1/2 A 1.2 – 1.8 bar 7 25 bar X  
031E0179 PS15B 7 – 15 bar G 1/2 A 1.7 – 2.3 bar 7 25 bar   X
031E0180 PSU15B 7 – 15 bar G 1/2 A 1.7 – 2.3 bar 7 25 bar X  
031E0191 PSU20  7 – 20 bar G 1/2 A 2 – 3 bar 11 25 bar X  
 

 

Conversion table PS/PSU to CS Switches

Old Version New Version
Type Code No. Relief Valve Included Stop Pressure Range [Bar] Stop Pressure Range [Bar] Code No. Type Order Relief Valve Separately
PS 4B 031E0171 No 1 to 4 2 to 6 031E021566 CS No
PSU 4B 031E0172 Yes 1 to 4 2 to 6 031E021566 CS 031E029866
PS 7B 031E0183 No 1 to 7 * 2 to 6* 031E021566 CS No
PS 7B 031E0183 No 1 to 7 * 4 to 12* 031E023566 CS No
PS 9B 031E0175 No 2.5 to 9.5 * 2 to 6* 031E021566 CS No
PS 9B 031E0175 No 2.5 to 9.5 * 4 to 12* 031E023566 CS No
PSU 9B 031E0176 Yes 2.5 to 9.5 * 2 to 6* 031E025566 CS 031E029866
PSU 9B 031E0176 Yes 2.5 to 9.5 * 4 to 12* 031E023566 CS 031E029866
PS 15B 031E0179 No 7 to 15 7 to 20 031E025566 CS No
PSU 15B 031E0180 Yes 7 to 15 7 to 20 031E025566 CS 031E029866
PSU 20 031E0191 Yes 7 to 20 7 to 20 031E025566 CS 031E029866
 

When the old pressure range is not covered by one new product completely, please select new switch based on set pressure point

 

CS Accessories and spare parts
Code no. Description
031E029166 Three pole contact system (TPST)
031E029366 Two Pg 16 screwed cable entries with gaskets (cable diam. 6.5 - 15 mm)
031E029666 Nipple with 7/16-20 UNF and M10 x 1 int.
031E029766 Pressure relief valve, incl. fixing screw (for 1/4 in. pipe/hose)
031E029866 Pressure relief valve, incl. fixing screw (for 6 mm pipe/hose)

 

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