Kromschroder Flame sensor 84320303

The Kromschroder Flame sensor 84320303 is a UV flame sensor designed for monitoring flames that emit UV radiation in industrial thermoprocessing setups. It operates with a supply voltage of 100–230 V AC at 50–60 Hz and features a quartz glass lens, aluminum housing, and a P578 UV tube. The sensor is compatible with Kromschroder BCU and PFU burner controls and has a connection thread of NPT 1/2 internal thread. It includes an M20 cable gland for cooling air connection and has a weight of 1000 g. The ambient and storage temperature range is -20 to 80 °C, and it is rated safety class 1 with pollution degree internal 2 and external 4.

When selecting a replacement UV flame sensor of this type, ensure the supply voltage, frequency, and connection thread match the existing system. The sensor must be compatible with the burner control unit, and the cable length between the sensor and control unit should be within the specified range. The distance between the UV sensor and the flame must be adjusted to the recommended range for proper detection. The cable gland size and clamping range of connection terminals should also be verified for compatibility.

Common failure modes for UV flame sensors include degradation of the UV tube, leading to reduced sensitivity or failure to detect the flame. This may cause the burner control to shut down or fail to start, often indicated by a fault code. Contamination of the quartz glass lens or improper alignment can also result in intermittent or no detection. Checking the sensor's output signal and cleaning the lens are typical diagnostic steps.