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Pressure switches for overpressure, for non-aggressive liquid and gaseous media


Pressure connection

External thread G 1/2 (pressure gauge connection) according to DIN 16 288 and internal thread G 1/4 according to ISO 228 Part 1.


Switching device

Robust housing (200) made of seawater-resistant diecast aluminium GD Al Si 12.


Degree of protection

IP 54, in vertical position.

Pressure sensor materials

DCM 3…DCM 63 Metal bellows: 1.4571 Sensor housing: 1.4104

DCM 025 – DCM 1 Metal bellows: Cu Sensor housing: Cu + Ms

DCM 4016/ Diaphragm: Perbunan

DCM 4025 Sensor housing: 1.4301

DCM 1000 Diaphragm: Perbunan

Sensor housing: Brass


Mounting position

Vertically upright and horizontal. DCM 4016 and 4025 vertically upright.


Ambient temp. at switching device

–25…+70 °C, except: DCM 4016,

4025, 1000: –15…+60 °C

For EEx-d versions: –15…+60 °C


Max. medium temperature

The maximum medium temperature at the pressure sensor must not exceed the permitted ambient temperature at the switching device.  Temperatures may reach 85°C for short periods (not EEx-d). Higher medium temperatures are possible provided the above limit values for the switching device are ensured by suitable measures (e.g. siphon).



Directly on the pressure line (pressure gauge connection) or on a flat surface with two 4 mm Ø screws.


Switching pressure

Adjustable from outside with screwdriver.


Switching differential

Not adjustable with DCM and Ex-DCM types.

Adjustable from outside with DCM-203 types.


Contact arrangement

Single-pole changeover switch.