Honeywell UV detector C7027A1023/U

The Honeywell C7027A1023/U is an industrial UV flame sensor used to detect ultraviolet radiation emitted by flames in gas, oil, or combined burners. It features a compact design and a 1/2-14 NPSM internal thread for installation on a 1/2-inch inspection tube. The detector is compatible with specific Honeywell amplifiers, including R7249A, R7290A, R7749B, R7849A/B, and R7851B, and can be connected in parallel with another detector for difficult flame reading situations. Wire length options are 6 ft [1.83 m] or 24 ft [7.32 m]. The spare part flange seal 129685 is available for this model.

When selecting a UV flame sensor of this type, ensure the connection thread matches the inspection tube (e.g., 1/2-14 NPSM). Verify compatibility with the amplifier model and control system. Consider the required wire length and whether parallel connection is needed. Installation involves mounting the sensor on the inspection tube and securing the electrical connections.

Common failure modes include sensor degradation or contamination, leading to false flame signals or loss of flame detection. Symptoms may include burner shutdowns, ignition failures, or erratic flame readings. Check the sensor lens for dirt or damage, and verify electrical connections and amplifier settings.