Honeywell Industrial flame sensor C7035A1023/U

The Honeywell C7035A1023/U is an industrial flame sensor that detects the presence of ultraviolet radiation emitted by a flame. It is used with Honeywell flame monitoring systems for gas, oil, and combined burners. The sensor features a UV detection tube, a 1/2-14 NPSM connection thread, and a 6 ft [1.83 m] wire length. Its housing meets NEMA type 4 and 4X standards, and the UV reading tube is replaceable in the field. Compatible with R7249A, R7290A, R7749B, and R7849A amplifiers.

When selecting a replacement flame sensor of this type, ensure the detector type (UV sensor) and detection principle (ultraviolet radiation) match the burner control system. The connection thread (e.g., 1/2-14 NPSM) must fit the mounting, and the wire length must be sufficient for the installation. Verify the housing standard (e.g., NEMA type 4/4X) meets environmental requirements. The UV reading tube should be compatible with the amplifier model.

Typical failures include a faulty UV tube, which may cause the burner to shut down or fail to ignite. Symptoms include intermittent flame detection or a false flame signal. Check the UV tube for damage or contamination, and verify the sensor's line of sight to the flame is unobstructed.