Flow monitor electronic SIKA VES 09

How it works: The electronic flow monitor works on the principle of temperature difference detection. In the cylindrical measuring probe There are two temperature sensors. They have optimal heat-conducting contact with the medium and at the same time a good thermal insulation to each other. The one sensor is heated with constant power, the other is not heated and thus assumes the medium temperature. When the medium is at a constant temperature difference between the two sensors.

 

The heated medium cools the heated sensor. The changed temperature difference between the two sensors depends on the flow velocity and thus a parameter for monitoring the preselected minimum flow. This signal is fed to a comparator, which drives a transistor output signal. The output signal is adjusted to the desired flow limit using a potentiometer. If this falls below, the transistor output signal is activated. A 6-digit LED chain indicates proximity to the set alarm point.

 

Electronic flow switch VES09. Type VES09. Compact design. Probe length 48 mm.. G1 / 2 external thread for direct installation. Material Sensor wetted by media stainless steel 1.4571. Medium temperature -20 ... 85 ° C. Max. Operating pressure 200 bar. Switching point ranges water 1 ... 150 cm / s, oil 3 ... 300 cm / s. Potentiometer for switching point adjustment. Indicator 6 LED. Power supply 24 V DC. Output signal PNP open collector. 4 pin sensor plug M12x1.