For the flow-dependent supervision of fans, regulating valves of humidifiers and electric coil heating systems according to DIN 57100, part 420 or for the combined application with DDC units. The sensor cable can be extended up to 100 m length. The sensor line must not be laid in parallel with mains supply cables. Recommended cable: 4 x 0.75 mm2, shielded. Sensor and monitor form a single unit with a joint order number.Caution: The controller and sensor form a single device and are calibrated for use with each other. Both have the same device umber and are the only devices compatible with each other. Connection of sensors from other devices is not permitted and will cause the device to malfunction.