Differential pressure switches are adjustable pressure switches for automatic burner controls. They are suitable for switching a circuit on, off or over on changes in actual pressure value relative to the set reference value. The reference value (switching point) is adjusted on a setting wheel provided with a scale. The differential pressure acts via the diaphragm against the force of the setting spring on the microswitch. The pressure switch operates without auxiliary power. The control unit responds to differential pressure. If the set reference value (mbar) is exceeded or undershot, the cicuit is switched on, off or over.
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