9
Gas Analyzer Operation
Manual Zero:Anytime afterwarm-up, youcanzero thegas readingsandcalibrate O2by
pressingthe “ZERO” button(Figure12).Oncethe buttonis depressed,you willsee thebutton
turnredshowingthebutton wasdepressed (Figure13).When thisoperation isbeingdone “ZE-
ROING”will bedisplayed inthestatusline(Figure14) andwill flushthe benchfor 30sec. with
ambientair frominsidetheanalyzer. Ifthe pumpsare shutdown, pushthe“ZERO”buttonand the
pumps willautomaticallystart. Note: The sample probe should be removed from the tailpipe,
when the unit is being zeroed.
Request Zero: The analyzerwill automaticallyrequest azero asneeded. Ifthe analyzer
requestsa zeroduring sampling,you canfinish yourtest firstbefore Zeroing.Thebenchcontrols
theZero requests,normallyafterseveralhours ofrunningthebenchwill notrequestaZero,but
longsampling ordrift maycause thisrequest. Ifany readingsare jumpydue tocontamination, just
keepthe pumpsrunning andZerooftentillthereadingsstabilize.
Figure 15
Low Flow Warning: If gas flow into the bench becomes restricted due to clogged filters or re-
strictedsamplehose, thestatus line will indicate “LOW FLOW” (Figure15) andthe pumps
wouldshutoff. To cleartheLOW Flowwarning, gotothe Leakcheck screentoperform aleak
test.Disconnect andcheckthe samplehose forrestrictions orkinks.If noproblems arefound,
checkthe filters.Begin withthe Externaland watertrap filter thencheck theInternal filter.Keepin
mind,the watertrapassemblythegasflowsthrough theinside tothe outsideofthe filter.The filter
maylookclean ontheoutside, butbe clogged onthe inside. Thebest check isto lookatthe
bottomof thewatertrap filter.If the LOW FLOW continuesto bedisplayed, thesolenoid valvewill
needtobe checkedor possibly replaceddue tocarbonbuildup. Pumpswillstart oncethe restric-
tion is cleared.
Figure 12 Figure 13
Figure 14
