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Danfoss Pressure Switches

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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


Code number selection
Code no.        Type         Regul.             Diff.min. range    Diff.max. range      Max. W/P    Conn.    Contact    Encl.
                                      range[bar]Pe          setting [b]             setting [b]            [bar] Pe       size       function
031E010466   CS   4,00 - 12,00 bar    1,00 - 3,00 bar     2,00 - 4,00 bar      12,0 bar       (1)          TPST      IP43  
031E020066   CS   2,00 - 6,00 bar      0,72 - 1,00 bar     1,00 - 2,00 bar        6,0 bar      G 1/4       TPST      IP43  
031E020266   CS   2,00 - 6,00 bar      0,72 - 1,00 bar     1,00 - 2,00 bar        6,0 bar      G 1/4                  (2) 
031E020566   CS   2,00 - 6,00 bar      0,72 - 1,00 bar     1,00 - 2,00 bar        6,0 bar      G 1/4        TPST     IP55  
031E021066   CS   2,00 - 6,00 bar      0,72 - 1,00 bar     1,00 - 2,00 bar        6,0 bar      G 1/2 A    TPST     IP43  
031E021566   CS   2,00 - 6,00 bar      0,72 - 1,00 bar     1,00 - 2,00 bar        6,0 bar      G 1/2 A    TPST     IP55  
031E021866   CS   2,00 - 6,00 bar      0,72 - 1,00 bar     1,00 - 2,00 bar        6,0 bar      G 1/2 A    TPST     IP55  
031E022066   CS   4,00 - 12,00 bar   1,00 - 3,00 bar     2,00 - 4,00 bar      12,0 bar      G 1/4        TPST     IP43  
031E022566   CS   4,00 - 12,00 bar   1,00 - 3,00 bar     2,00 - 4,00 bar      12,0 bar      G 1/4        TPST     IP55  
031E023066   CS   4,00 - 12,00 bar   1,00 - 3,00 bar     2,00 - 4,00 bar      12,0 bar      G 1/2 A     TPST     IP43  
031E023566   CS   4,00 - 12,00 bar   1,00 - 3,00 bar     2,00 - 4,00 bar      12,0 bar      G 1/2 A     TPST     IP55  
031E024066   CS   7,00 - 20,00 bar   2,00 - 3,50 bar     3,50 - 7,00 bar      20,0 bar      G 1/4        TPST     IP43  
031E024566   CS   7,00 - 20,00 bar   2,00 - 3,50 bar     3,50 - 7,00 bar      20,0 bar      G 1/4        TPST     IP55  
031E025066   CS   7,00 - 20,00 bar   2,00 - 3,50 bar     3,50 - 7,00 bar      20,0 bar      G 1/2 A     TPST     IP43  
031E025566   CS   7,00 - 20,00 bar   2,00 - 3,50 bar     3,50 - 7,00 bar      20,0 bar      G 1/2 A     TPST     IP55 
031E026566   CS   2,00 - 6,00 bar              -                              -                         6,0 bar      G 1/2 A    TPST      IP55  
031E027166   CS   4,00 - 12,00 bar   1,00 - 3,00 bar     2,00 - 4,00 bar      12,0 bar      G 1/2 A     TPST     IP43  
031E101066   CS   2,00 - 6,00 bar     0,72 - 1,00 bar     1,00 - 2,00 bar         6,0 bar      G 1/2 A     TPST     IP43  
031E101266   CS   4,00 - 12,00 bar   1,00 - 3,00 bar     2,00 - 4,00 bar       12,0 bar     G 1/2 A     TPST     IP43  
031E101466   CS   7,00 - 20,00 bar   2,00 - 3,50 bar     3,50 - 7,00 bar       20,0 bar     G 1/2 A     TPST     IP43  
031E218866   CS   2,00 - 6,00 bar     0,72 - 1,00 bar     1,00 - 2,00 bar         6,0 bar      G 1/2 A     TPST     IP43  
031E219166   CS   2,00 - 6,00 bar     0,72 - 1,00 bar     1,00 - 2,00 bar         6,0 bar      G 1/2 A     TPST     IP43

Note (1)  1/4 in-18 NPT int.
Note (2)  SPDT 1-pole w. looped circuit  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.

Stop                   Min.               Max.             Max. test          relief valve          Pressure        Code no.         Type
pressure    differential     differential        pressure           1/4 flare          connection
range bar          bar                  bar                    bar         with       without          bsp
1 to 4              0.6-0.7                 3                       20                                x             1/2              031E0171        PS4B 
1 to 4              0.6-0.7                 3                       20              x                               1/2              031E0172     PSU4B
1 to 7            0.95-1.3                 3                       20                                x             1/2              031E0182        PS7B
2,5 to 9,5       1.2-1.8                 7                       25                                 x             1/2              031E0175        PS9B
2,5 to 9,5       1.2-1.8                 7                       25              x                                1/2              031E0176     PSU9B
7 to 15           1.7-2.3                 7                       25              x                                1/2              031E0179      PS15B
7 to 15           1.7-2.3                 7                       25              x                                1/2              031E0180   PSU15B


Click to View Danfoss CS pressure switch technical  pdf


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