Spectrex 20/20MPI - Commercial IR3 Flame Detector - Manual (Page 31)

TM 20/20MPI, Rev (D) September 2013
Built-In Test 19
An unsuccessful BIT sequence activates the following:
 The FAULT relay opens in model 20/20MPI-R.
 0-20 mA output indicates BIT FAULT (2 mA) in model 20/20MPI-M.
 The LED flashes (4 Hz) at yellow.
 BIT procedure is performed every 1 minute.