AO2000 CONTINUOUS GAS ANALYZERS  |  OI/AO2000-EN REV. B  263
 
 
 
ZO23: Check of the end point and reference point 
NOTE 
Information for test gases can be found in the section "ZO23: Preparation 
for installation" (see page 67). 
Check of the end point 
It is recommended that the end point is checked approx. 4 weeks after 
start-up. 
Further checks of the end point should be carried out as required. 
Check of the reference point 
It is recommended that the reference point is checked once a year or as 
required.