Section 4
Basic Stack Sampling
Performing an Emission Test
Allow the analyzer to complete the 3-minute Auto Zero / Span procedure prior to beginning the emission test.
Insert the probe into the designated sampling port in the stack and allow the analyzer to draw the gas sample
for a minimum of 3 minutes to allow the readings to stabilize and the sensors to respond fully to the gas
concentration.
Please note: The entire operational procedure for performing the emission test is dependent on the
application and the objective of the emission testing. For service and maintenance applications, setting the
instrument up properly and allowing the analyzer’s reading to stabilize prior to making adjustments to the
combustion source may be sufficient. For regulatory compliance testing, please contact your local Air Quality
Board or similar agency to determine if specific test protocols are to be followed.
Verification of the portable
analyzer for calibration, drift, span, interference, and other parameters, before and after an emissions
compliance test may be required by the local regulatory agency. You can ensure accurate and repeatable
results by following an established protocol. Check with the agency for any existing protocols they may
prefer or acknowledge.
ECOM America Ltd. can help you obtain acceptable protocols for your area, if required.
Additional Notes:
Variances in the analyzer’s core temperature may affect the reading and accuracy of electrochemical
sensors. Care should be taken to insure that the core temperature of the analyzer not vary by more than 15
degrees F in either direction over the testing time. It is best to allow the analyzer to acclimate to ambient
temperatures prior to start-up.
Turning the Instrument Off
When turning the instrument off, remove the probe from the stack and allow the pump to draw fresh air
through the sample line for a few minutes. Allow the CO, NO, NO2, etc. readings to return to below 15 ppm
and O
2
to rise above 20.0% before switching the ECOM J2KN off.
Upon being switched off, the instrument will automatically start a purging cycle that continues until the gas
values drop to zero, a process that prevents the instrument from being stored with gas in the line. The
condensate pump will run and empty any moisture that may have collected in the water trap bowl.
Disconnect the sample line and thermocouple connections and carefully store them in a suitable storage
compartment.
If the instrument is to be stored in excess of 1 month, it should be fully charged before storage and charged
again for approximately 24 hours prior to usage.
