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
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