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Danfoss CS range of air compressor pressure switches offer superior pressure regulation for air compressors. Danfoss produce air compressor pressure switches with or without a relief unloader valve to sense line pressure and provide a control signal to system valves.
Pressure switch type CS is part of the Danfoss pressure control range. All CS pressure switches have a built-in pressure-operated, three-pole or one-pole switch, the contact position of which depends on
− the pressure in the connector
− the range setting.
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. 
CS product range
• Standard CS pressure switches
− pressure connection: G ½ or G ¼
• CS pressure switches with special pressure connection made of polyacetal
− suitable in drinking water applications
− pressure connection: G ½
Stop pressure range Pressure switches are supplied in the following three versions:
− low-pressure, 2-6 bar
− intermediate pressure, 4-12 bar
− high-pressure, 7-20 bar. Contact system
Three-pole (TPST), contact system which opens on rising pressure. The contact system is touch-safe with open terminals, self-lifting terminal screws and star/slot screws. Cable entry
The pressure switches have threads for two PG 16 screwed cable entries. Screwed cable entries
Screwed cable entries are supplied with single pack CS pressure switches. Screwed cable entries for CS in industrial packs must be ordered separately under code no. 031E029366 containing seals and Pg 16 nuts. Pressure relief valve
This valve relieves (unloader valves) pressure on the compressor piston. It can be supplied as an accessory and must be ordered separately. The valve has an M10 x 1 external thread, union nut and cutting ring. The nut and cutting ring are both available in 6 mm and 1/4 inch sizes. Manual switch
When the manual switch has been used to lock the contact system in its open position, the cover can be removed without the plant starting. Enclosure
The enclosure is made of plastic (PA 6) and is obtainable in IP 43 or IP 55 versions to IEC 529. A knockout in the base of the enclosure can be removed to provide a drain hole for condensate.
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 relief valves
031E029766 Pressure relief valve with 1/4 IN PIPE/HOSE , INCL FIXING CS
031E029866 Pressure relief valve with 6 MM PIPE/HOSE , INCL FIXING CS Pressure switches types PS and PSU - Obsolete
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.
PS-PSU Specifications
Switch
Three-pole switch (TPST) that breaks on rising pressure. Connections
Process connection: 1/2" bsp female
Pressure relief valve: 1/4" flare connection Contact load
Alternating current: 9 A (AC,) at Ue = 500 V
Motor load : 4 kW (5.5 hp) at
3 x 380/415 V
1.1 kW (1.5 hp) at
1 x 220/240 V Direct current : 6 A, 220 V Vibration-resistance
Vibration-stable in the range 10•200 Hz, 2 g Enclosure
IP 55 to IEC 529
The base is made of grey-enamelled steel plate, the top of grey polypropylene. The cover is fastened with two stainless steel screws. All pressure switches have a manual switch fitted on the side of the base. Mechanical life: 400000 operations Cable entry
Two Pg 16 screwed cable entries for cable diameters from 9 to 15 mm. Materials in contact with the medium
Membrane: Nitrile rubber Pressure connector: Silumin Electrical life : 100000 operations Identification
The type designation and code number are stamped in the side of the unit. Ambient temperature: -20 to + 70°C
Temperature of medium : - 20 to + 100°c Spare parts
Contact set: code no. 031E0065 (no longer available)
Diaphragm: code no. 031E0346 (no longer available)
Flange: code no. 031E0400 (no longer available)
** OBSOLETE replaced by CS range- Table for pressure reference only *** 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
*** NOTE: PS AND PSU RANGES OBSOLETE - REPLACED BY CS RANGE ABOVE ***
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