Siemens Combustion QRA2(1) UV Detector R-134A The Robertshaw 620-202 is rated

The Robertshaw 620-202 is rated for continuous operation

this module is specifically listed as a suitable protector for ZR300KC and other large scroll models

when operated at 208V

supporting 120/240 VAC applications

suitable for most commercial pneumatic control air systems

Siemens Combustion QRA2(1) UV Detector R-134A The Robertshaw 620-202 is ratedThe Siemens Combustion QRA2(1) UV Detector is a high performance ultraviolet flame sensor designed specifically for the supervision of gas and oil flames in industrial and commercial burner systems. Engineered for intermittent operation, this normal sensitivity detector utilizes a side viewing photodiode to monitor UV radiation in the 190 to 270 nm spectral range. The QRA2(1) features a specialized metallized plastic housing that effectively prevents