S 409 flow

Flow direction switch for compressed air / gases

The thermal mass flow direction switch S 409 allows the detection of an existing flow and the direction of the flow. It can be used in compressed air and non-corrosive gases.

The sensor element is very robust and completely of stainless steel. Through a 1/2” G-type ball valve the switch can be inserted into the pipe under pressure.

The flow and direction information is output through 2 normally open relay switches. This signals can be transferred to the SUTO flow sensor to activate and deactivate the flow measurement depending on the flow direction.


Product features

Detects smallest changes No mechanical wear parts
Easy installation under pressure
All parts which are in contact with flow medium are made of stainless steel

Technical data

Technical data S 409
Detection range 0.02 … 25 m/s @ 7barg, 20 °C
Sensor 2 x Pt 1000
Medium air, gases
Medium humidity <100% (no condensation)
Medium temp. -20 … 80 ºC
Ambient temp. -20 … 70 ºC
Operating pressure 0 … 16 bar
Power supply 24 VDC, 60 mA
Output 2 x Relay, 60V, 1A
Process connection 1/2” G type