Danfoss CS Air Compressor Switches

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 number	Type	Regul. range [bar] Pe	Conn. size	Diff. min. range setting [bar]	Diff. max. range setting [bar]	Max. working pressure [bar] Pe	Contact function	Encl.
031E020066	CS	2,00 - 6,00 bar	G 1/4	0,72 - 1,00 bar	1,00 - 2,00 bar	6,0 bar	TPST	IP43
031E020266	CS	2,00 - 6,00 bar	G 1/4	0,72 - 1,00 bar	1,00 - 2,00 bar	6,0 bar	SPDT	IP43
031E020566	CS	2,00 - 6,00 bar	G 1/4	0,72 - 1,00 bar	1,00 - 2,00 bar	6,0 bar	TPST	IP55
031E021066	CS	2,00 - 6,00 bar	G 1/2 A	0,72 - 1,00 bar	1,00 - 2,00 bar	6,0 bar	TPST	IP43
031E021566	CS	2,00 - 6,00 bar	G 1/2 A	0,72 - 1,00 bar	1,00 - 2,00 bar	6,0 bar	TPST	IP55
031E021866	CS	2,00 - 6,00 bar	G 1/2 A	0,72 - 1,00 bar	1,00 - 2,00 bar	6,0 bar	TPST	IP55
031E022066	CS	4,00 - 12,00 bar	G 1/4	1,00 - 1,50 bar	2,00 - 4,00 bar	12,0 bar	TPST	IP43
031E022566	CS	4,00 - 12,00 bar	G 1/4	1,00 - 1,50 bar	2,00 - 4,00 bar	12,0 bar	TPST	IP55
031E023066	CS	4,00 - 12,00 bar	G 1/2 A	1,00 - 1,50 bar	2,00 - 4,00 bar	12,0 bar	TPST	IP43
031E023566	CS	4,00 - 12,00 bar	G 1/2 A	1,00 - 1,50 bar	2,00 - 4,00 bar	12,0 bar	TPST	IP55
031E024066	CS	7,00 - 20,00 bar	G 1/4	2,00 - 3,50 bar	3,50 - 7,00 bar	20,0 bar	TPST	IP43
031E024566	CS	7,00 - 20,00 bar	G 1/4	2,00 - 3,50 bar	3,50 - 7,00 bar	20,0 bar	TPST	IP55
031E025066	CS	7,00 - 20,00 bar	G 1/2 A	2,00 - 3,50 bar	3,50 - 7,00 bar	20,0 bar	TPST	IP43
031E025566	CS	7,00 - 20,00 bar	G 1/2 A	2,00 - 3,50 bar	3,50 - 7,00 bar	20,0 bar	TPST	IP55
031E026566	CS	2,00 - 6,00 bar	G 1/2 A	0,72 - 1,00 bar	1,00 - 2,00 bar	6,0 bar	TPST	IP55
031E027166	CS	4,00 - 12,00 bar	G 1/2 A	1,00 - 1,50 bar	2,00 - 4,00 bar	12,0 bar	TPST	IP43
031E101066	CS	2,00 - 6,00 bar	G 1/2 A	0,72 - 1,00 bar	1,00 - 2,00 bar	6,0 bar	TPST	IP43
031E101266	CS	4,00 - 12,00 bar	G 1/2 A	1,00 - 1,50 bar	2,00 - 4,00 bar	12,0 bar	TPST	IP43
031E101466	CS	7,00 - 20,00 bar	G 1/2 A	2,00 - 3,50 bar	3,50 - 7,00 bar	20,0 bar	TPST	IP43
031E218866	CS	2,00 - 6,00 bar	G 1/2 A	0,72 - 1,00 bar	1,00 - 2,00 bar	6,0 bar	TPST	IP43
031E219166	CS	2,00 - 6,00 bar	G 1/2 A	0,72 - 1,00 bar	1,00 - 2,00 bar	6,0 bar	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.

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 bap	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 4 to 12	031E021566 031E023566	CS	No
PS 9B	031E0175	No	2.5 to 9.5	2 to 6 4 to 12	031E021566 031E023566	CS	No
PSU 9B	031E0176	Yes	2.5 to 9.5	2 to 6 4 to 12	031E025566 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.

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)

 

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