The KOBOLD Model KAL-L electronic flow switch monitors air and gas flow. It is suited for securely monitoring flows with mini-mum pressure loss.
Function
The operation of the electronic flow monitor KAL-L is based on the proven calorimetric principle. A sensor is heated to a few degrees above the temperature of the flow medium. When the medium flows, the heat generated in the sensor is transferred to the medium, i.e, the sensor is cooled. This cooling process is a measure of the flow velocity. A second sensor measures the medium temperature.
The electronics compares the resistances of both sensors by means of a Wheatstone bridge circuit, and switches an output relay if the actual value drops below the set switching value.