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Mechanical pressure switches

Explanation of type designations – type codes

Explanation of type designations –

type codes

The type designations of FEMA pressure switches consist of a combination of letters followed by a

number denoting the setting range. Additional functions and version variants are indicated by an extra

code which is separated from the basic type by a hyphen. Ex versions (explosion protection Ex-d)

are identified by the prefix "Ex" in front of the type designation.

Basic version

With additional function

Ex version

(based on the example of DCM series)

DCMXXX

DCMXXX-YYY

Ex-DCMXXX

DCM

Series code (e. g. DCM)

XXX

Codes for pressure range

YYY

Code for additional function

Ex

Code for Ex-version

Which additional function fits with which pressure switch?

Plug connection, 200 series

Additional function ZF

Terminal connection, 300/500 series

Additional function ZF

203

213

217

301

307

513

574

575

351

576

577

DCM/VCM

•1

•

•1

•

•1

•

VNM/DNS/VNS

•

•

•

•

•

•

DWAM

•

•

•

•

•

DDCM

•

•

•

DWR

•

•

•

•

•

•

DGM

•

•

•

•

•

• available

1

except DCM4016, DCM4025, VCM4156 and DCM1000

Combination of several additional functions not possible!

Ex versions (Ex-d) can only be supplied in basic form.

Additional functions are not possible.

DCMXXX

Basic version with plug connection housing

DCMXXX-2...

Basic version with plug connection housing

DCMXXX-3...

Terminal connection housing (300)

Ex-DCMXXX

Ex-d switching device (700)

DCMXXX-5...

Ex-ia version (500)

Switch housing version