Tubo UV Honeywell 191286

A Honeywell 191286 UV tube is a flame-sensing component used in burners equipped with a UV detector system. In oil, industrial gas or dual-fuel burners the burner control relies on a UV-sensitive tube to confirm the presence of ultraviolet radiation emitted by the flame. The UV tube is mounted inside a scanner or sight tube aimed at the combustion zone; its electrical output is interpreted by the burner control’s amplifier module. If the UV signal is lost during the safety time, the control initiates a lockout. Parts of this type are selected primarily by the electrical characteristics expected by the control box (supply voltage, signal output type) and by the mechanical interface – thread or bayonet mount, cable length and connector format. Operating wavelength range and sensitivity also matter, though these are specific to the burner control which the tube is matched to. When replacing a UV tube, check that the replacement has the same base, cable termination and approximate sensitivity. Typical failure modes for such sensors include gradual loss of sensitivity as the glass envelope degrades under UV exposure, intermittent signal due to a cracked glass or broken solder joint, and electrical leakage across the base insulation from contamination. Always verify that the new tube is compatible with the existing scanner housing and that the wiring polarity is correct – some controls require a shielded cable. No further technical data is supplied for this specific article beyond the name and catalogue codes, so confirm the required performance with the burner control documentation before ordering.