The differential pressure switch in the surface-mounted housing is suitable for switching an electrical circuit on/off or changing over when the pressure changes. The setpoint (switching point) is set manually using an adjustment wheel with a scale. The electrical circuit is switched when the setpoint is exceeded or not reached. The permissible ambient and medium temperature is -15 to +60 °C. The process connection is made via two hose connectors with a diameter of 4.6 mm.