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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.
Danfoss CS switches

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
Danfoss - PS-PSU Switches

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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