Honeywell 122037 quartz lens

The Honeywell 122037 quartz lens is a sensor component used in optical flame detection systems. In oil-fired and industrial burners, UV or IR detectors monitor the presence of flame; the quartz lens sits in the detector housing, focusing incoming radiation onto the sensitive element while shielding it from high temperatures and combustion gases. This type of lens is made from quartz specifically because ordinary glass attenuates ultraviolet light, making it unsuitable for UV-based flame sensors. When replacing a quartz lens, check for cracks, pitting, or deposits that can reduce optical transmission. The lens must be clean and free of scratches to avoid false flame signals or loss of sensitivity. No standard selection parameters apply—fit and optical clarity are the key criteria. The Honeywell 122037 is identified by manufacturer codes 122037/U and 534.457.003; always verify that the replacement lens matches the detector model’s mounting geometry and material specification.