Deutsch 
English These UV flame sensors are used for monitoring gas flames, yellow/blue-burning oil flames and for monitoring ignition sparks in intermittent operation. The sensitivity is in the wavelength range 190 ... 270 nm.
Service note:The UV cell is glued into the housing and cannot be replaced separately. When the UV cell reaches the end of its service life, the entire sensor must be replaced.
QRA4... can be supplied with normal or high sensitivity (M). The sensor is attached directly to the burner or boiler using a ¾"-14 NPSM connection thread. Connection cable approx. 1.8 m long.
QRA4... can be used in conjunction with the automatic burner controls type LGB2../LGB4.., LFL.., LFE1.., LFE10.., LFS1..., LME21../LME22../LME41../LME44.., LME39.., LME7.. and LMV2../LMV3../LMV5... (intermittent operating mode).
Service note:The UV cell is glued into the housing and cannot be replaced separately. When the UV cell reaches the end of its service life, the entire sensor must be replaced.
QRA4... can be supplied with normal or high sensitivity (M). The sensor is attached directly to the burner or boiler using a ¾"-14 NPSM connection thread. Connection cable approx. 1.8 m long.
QRA4... can be used in conjunction with the automatic burner controls type LGB2../LGB4.., LFL.., LFE1.., LFE10.., LFS1..., LME21../LME22../LME41../LME44.., LME39.., LME7.. and LMV2../LMV3../LMV5... (intermittent operating mode).