Deutsch 
English Kromschröder DG 50UG-9K2 pressure switch for monitoring gas and air pressures, also for biogas, with handwheel for switching point adjustment, can be used as a ''special design pressure switch'', EU-certified.
Technical data:
Setting range: 2.5-50 mbar
Function: Switches on rising positive pressure (gas/air), negative pressure (air), differential pressure (air-air)
With gold-plated contacts: Yes
Electrical connection: With 4-pin plug, with socket, IP 65
Feedback: Red/green control LED for 24 V~/=
Technical data:
Setting range: 2.5-50 mbar
Function: Switches on rising positive pressure (gas/air), negative pressure (air), differential pressure (air-air)
With gold-plated contacts: Yes
Electrical connection: With 4-pin plug, with socket, IP 65
Feedback: Red/green control LED for 24 V~/=