E8500 Instruction & Operations Manual
version 1.017
Page 37 of 49
7. Turn on the gas flow and observe gas readings. If the gas reading for the sensor
being calibrated does not increase after a few seconds, turn off the gas flow until
the problem is found. Otherwise, press OK.
8. Continue to monitor the readings of all of the gas sensors including oxygen. If the
calibration gas being used has a balance of nitrogen, observe that the oxygen
reading reaches a minimum of 0.1% (0.4% for nitrogen dioxide). If not,
troubleshoot the system for leaks, or replace the oxygen sensor. Monitor the
other gas sensors for cross sensitivity.
9. When the countdown reaches 3 seconds, there will be a series of beeps. Verify
that the reading for the sensor being calibrated matches the value entered in the
calibration menu, and that the reading for all of the other sensors is zero. Turn off
the gas flow.
10. Repeat this procedure for each electrochemical sensor to be calibrated.
11. After all of the sensors are calibrated, turn the unit off and back on again, and
perform an autozero.
12. Check the accuracy of each sensor by applying the gas and observing the
readings.
NDIR Gas Sensors
1. Turn the analyzer on and press OK to perform an autozero. Allow the instrument
to warm up for 15 minutes, and repeat the autozero.
2. Connect the outlet from the tee fitting of the gas calibration fixture to the
connector on the front of the analyzer labeled “SAMPLE IN” using the set up
shown on the previous page.
3. Press the button labeled “CALIB” to enter the calibration menu.
4. Scroll down to the SPAN TIME and set the value to 20 seconds.
5. Scroll down to the sensor to be calibrated. If the calibration lock is on, enter the
password 1315.
6. Use the arrow keys to enter the span value printed on the calibration cylinder.
Press OK
7. Turn on the gas flow and observe gas readings. If the gas reading for the sensor
being calibrated does not increase after a few seconds, turn off the gas flow until
the problem is found. Otherwise, press OK.
8. When the countdown reaches 3 seconds, there will be a series of beeps. Verify
that the reading for the sensor being calibrated matches the value entered in the
calibration menu, and that the reading for all of the other sensors is zero. Turn off
the gas flow.
9. Repeat this procedure for each NDIR gas to be calibrated.
10. After all of the sensors are calibrated, turn the unit off and back on again, and
perform an autozero.
11. Check the accuracy of each sensor by applying the gas and observing the
readings.
IMPORTANT: For the NDIR channels, the span calibration must be carried out
within 3 minutes of auto-zeroing the analyzer.
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