134 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
ZO23: Gas analyzer start-up
Gas analyzer start-up procedure, initial calibration at the installation site
1 Turn on the gas analyzer power supply.
After approx. 15 minutes, the sample cell has reached its operating
temperature. If required, the gas analyzer can be calibrated at the ref-
erence point (see step 3) and the end point (see step 5).
2 For setting the reference point (= electrical zero), feed ambient air wait
and until the measured value has stabilized (duration approx. 2 hrs.).
Meanwhile, purge the test gas valves and the gas supply line with oxy-
gen-free gas (e.g. with nitrogen from a loop feeder) or with sample gas
(flow rate 5 to 10 l/h).
3 Set reference point to 20.6 vol.% of O
2
.
4 Feed span gas and wait until the measured value has stabilized (dura-
tion max. 2 hrs.).
5 Set end-point value in accordance with the certificate of analysis of
6 The gas analyzer is ready for performing measurements; feed sample
gas.
NOTE
Information for test gases can be found in the section "ZO23: Preparation
for installation" (see page 67).
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