Clean up purge air motor and filter motor-swivel windows T/R, R unit  also flange with tube of Dust Hunter also alignment Dust Hunter-transducer A & B of Flowsic-CEMS room-filter cabinet MCS 100 E-CEMS gas room from dirty of dust use instrument air supply. Replace H2 bottle for FIDOR continue calibration zero and span result normal ( RIZAL & EVE CINDA )