Bircher DW Switch – Bircher DW40 contact without housing – NO

DW Switch – Bircher DW40 contact – NO contact

A pressure wave, generated by the signal transmitter, reaches the air pressure switch. The diaphragm deflects and the electrical contact closes.
As long as the inlet pressure exceeds the response pressure, the electrical contact remains closed.
The switch’s response behaviour can be individually adjusted using the contact screw (K) and the valve screw (V).

From 2023, the setting of adjustment screw V will be a fixed value; for health and safety reasons, these may no longer be adjusted.

- excluding grey housing
- fitted with a plug connection
- 1 x NO contact – (normally open/make contact)
- maximum pressure 15 mbar
- response pressure 2 mbar
- pressure compensation 110 ml/min at 2 mbar