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Air Pressure Differencial Switch (20-300PA)


Differential pressure switches are suited in commercial and industrial air conditioning and ventilating systems.

Commonly used with:

  • Filter monitoring
  • Correct fan functioning control
  • Low pressure and overpressure monitoring



Differential pressure for air controls

Alarm activation at a pre-set value.


Air Pressure switches measure between 20-300Pa. Electrical connections are made by use of two-core cable. Incorporated in each Merlin Gas Interlock system is a 10 seconds Airflow dropout delay. In the event of interruptions to airflow for less than 10 seconds the delay will allow the gas solenoid valve to remain open, preventing nuisance tripping. Should the airflow be interrupted for 10 seconds or more the fan fault LED will illuminate and the gas solenoid valve will close. 

Air PD Switch

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