EMS 5002 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 13). When this operation is being done "ZEROING"
will be displayed (Figure 14). The analyzer will shut down automatically if no CO2 is detected
after approx. 15 min. If the pump is off, "STAND BY" will be displayed (Figure 15). Push the
"ZERO" key and the pumps will automatically start. Note: The sample probe should be
removed from the tailpipe, when the unit is being zeroed.
Automatic Zero: The analyzer will automatically zero as needed. If the analyzer does
not sense exhaust gases, the automatic zero procedure will begin. "ZEROING" will be dis-
played during this process. If exhaust gases are present, the analyzer will wait until the gases
are clear.
Figure 13
Figure 15
Low Flow Warning: If gas flow into the bench becomes restricted due to clogged filters or
restricted sample hose, the screen will indicate "LOW FLOW" (Figure 16). Check the
sample hose for restrictions or kinks. If no problems are found, check the filters. Begin with
the External filter and then check the Internal filter. Keep in mind 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 bootom of the external filter. If the LOW FLOW
continues to be displayed, the solenoid valve will need to be replaced due to cardon build-up.
Figure 16
Gas Analyzer Operation
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Figure 14