Honsberg Calorimetric Flow SwitchEFK2

The EFK2 flow switch controls the flow speed of fluid media. Its compact form combines the built-in sensor, a two-colour LED status display, and a switching point which can be set using a potentiometer; it has push-pull or relay output. A flexible gooseneck can be installed between the sensor and the electronics housing, so that the best possible view of the flow switch display is provided even in awkward installation locations.

Technical data
Sensor calorimetric measurement principle
Process connection screw-in thread G 1/4 A..G 1/2 A, push-in sensor Ø12 mm
Metering range water 2..150 cm/s or 3..300 cm/s oil available on request
Measurement accuracy ±10 % of full scale value
Dynamics 1..3 seconds in water
Pressure resistance PN 100 bar optionally PN 200 bar
Media temperature 0..70 °C
Ambient temperature -20..+70 °C
Temperature gradient 4 K/s
Supply voltage 24 V DC / AC ±10 %
Current consumption max. 70 mA
Switching output galvanically separated relay contact or “push-pull” transistor output (resistant to short circuits and reversal polarity protected)
Output loading 2 A / 30 V DC/AC max. for relay, 100 mA / 24 V max. for transistor output
Display red / green LED (red < limit value, green > limit value)
Adjustment potentiometer as input
Electrical connection for round plug connector M12x1, 4-pole
Resistant to short circuits yes