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Instruction 24-9448 4-1
Operation
4 Operation
4.1 Operating Tips
• When an analyzer is brought in from a cold vehicle, let it warm up slowly
to minimize condensation. Temperatures below freezing will not dam-
age the analyzer; however, bringing a cold analyzer into a warm, humid
environment may cause condensate to form inside the case.
CAUTION: Although the analyzer itself is not damaged by an extremely
cold environment, the electrochemical sensors may be damaged. The O
2
sensor's electrolyte will freeze at approximately -20 ºF and the other sen-
sors at approximately -94 ºF. If the analyzer is exposed to an extremely
cold condition, it is strongly suggested that the sensor housings be exam-
ined for hairline cracks. Be aware that a leaking sensor can cause chemi-
cal burns to the skin and possibly damage the PCB assemblies.
• Ensure that the analyzer is sampling fresh air when turned ON. Pulling
a stack-gas sample through the analyzer during its warm-up period will
not damage the analyzer, but it will result in incorrect sensor readings,
and may result in sensor error messages appearing after the warm-up
cycle completes.
• Note that flue-gas condensate is acidic and very corrosive. It is important
not to allow the analyzer’s internal components to come in contact with
condensate for long periods of time.
• Before each use, inspect the filter element of the water-trap / filter as-
sembly. Replace the filter if it looks dirty. Refer to Section 6.2.
• When sampling flue-gas, keep the analyzer above the water-trap, and
keep the trap in a vertical position. This will maximize the effectiveness
of the trap and keep liquid condensate from being drawn directly into the
analyzer.
• When liquid condensate is seen inside the water trap, empty the trap
before it becomes full. Refer to Section 4.9.
• It is recommended that the analyzer be purged after performing a com-
bustion test. Once the probe is removed from the stack, let the pump run
for 10 minutes or so to completely remove any remaining stack gases and
dry any condensate from inside the sensor chamber and probe assembly.
If the analyzer is turned OFF with high levels of flue gas remaining
in the analyzer, then the pump will continue to run and the message
“PURGING SENSORS” will appear on the display until all flue gas
levels fall below predetermined levels.
• When storing the analyzer, it’s a good idea to empty the water trap and
leave it open to further dry it out.
• Calibrate the analyzer every
6 months to assure its accuracy.