EMS 5003 Operator's Manual page 9

Manual Zero: Any time after warm-up, you can zero the gas readings and calibrate O2 by
pressing the "ZERO" button (Figure 12). Once the button is depressed, you will see the button
turn red showing the button was depressed (Figure 13). When this operation is being done "ZE-
ROING" will be displayed in the status line (Figure 14) and will flush the bench for 30 sec. with
ambient air from inside the analyzer. If the pumps are shut down, push the "ZERO" button and the
pumps will automatically start. Note: The sample probe should be removed from the tailpipe,
when the unit is being zeroed.
Request Zero: The analyzer will automatically request a zero as needed. If the analyzer
requests a zero during sampling, you can finish your test first before Zeroing. The bench controls
the Zero requests, normally after several hours of running the bench will not request a Zero, but
long sampling or drift may cause this request. If any readings are jumpy due to contamination, just
keep the pumps running and Zero often till the readings stabilize.
Figure 12
Low Flow Warning: If gas flow into the bench becomes restricted due to clogged filters or re-
stricted sample hose, the status line will indicate "LOW FLOW" (Figure 15) and the pumps
would shut off. To clear the LOW Flow warning, go to the Leak check screen to perform a leak
test. Disconnect and check the sample hose for restrictions or kinks. If no problems are found,
check the filters. Begin with the External and water trap filter then check the Internal filter. Keep in
mind, the water trap assembly the gas flows through the inside to the outside of the filter. The filter
may look clean on the outside, but be clogged on the inside. The best check is to look at the
bottom of the water trap filter. If the LOW FLOW continues to be displayed, the solenoid valve will
need to be checked or possibly replaced due to carbon buildup. Pumps will start once the restric-
tion is cleared.
Gas Analyzer Operation
Figure 14
Figure 13
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Figure 15