Specifications
PCA
®
3
42
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 damage the analyzer.
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 sensors at approximate-
ly -94 ºF. If the analyzer is exposed to an extremely cold
condition, it is strongly suggested that the sensor housings
be examined for hairline cracks. Be aware that a leaking
sensor can cause chemical 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 fl ue-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 fi lter element of the water-trap / fi lter
assembly. Replace the fi lter if it looks dirty. Refer to Section 6.2.
• When sampling fl ue-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 4.11.
• The analyzer should be purged after performing a combustion test.
After removing probe from the stack, let the pump run for at least
10 minutes to remove any stack gases and dry any condensate
from inside the sensor chamber and probe assembly. If the
analyzer is turned OFF with high levels of fl ue gas remaining in
the analyzer, then the pump will continue to run and the message
“ PURGING SENSORS” will appear on the display until all fl ue
gas levels fall below predetermined levels.