Siemens UV cell AGR450242680

This is a Siemens UV cell, SKU AGR450242680, a sensor component for flame detection. It is the OEM equivalent of the Landis & Gyr AGR450242680. Its operating principle is detection of ultraviolet radiation from the combustion process, making it suitable for oil-fired or industrial burners. The lens is made of quartz, and the cell is mounted in the burner's flame observation port.

When selecting a replacement UV cell of this type, match the spectral sensitivity range (typically 190–290 nm), response time, supply voltage, and output signal type to the burner control. The housing, connector, and cable length must also fit the existing installation, and compatibility with the specific burner control model must be verified. Before installation, isolate the burner and disconnect the power supply. Inspect the quartz window for sooting or cracking, and ensure a proper seal to prevent false readings from stray light. Confirm that the wiring and connector are in good condition, as poor contact can mimic a flame loss.

Contamination is a common cause of failure; sooting or cracking of the quartz window blocks the ultraviolet radiation. The burner may lock out during the start sequence because no flame signal is received within the safety time. Poor electrical contact can mimic a flame loss, leading to repeated shutdowns. Clean or replace the window and check wiring and connectors when such behaviour occurs.