Siemens QGO21 Series Basic Documentation page 5

Building Technologies Division

The sensor must always be installed so that the connecting part (head to the
flange) remains free and that unimpeded air exchange through the reference air
slots is guaranteed. Otherwise, there is a risk of false measurements, which can
lead to dangerous conditions

Ensure that the hot QGO21 does not get into contact with explosive or inflammable
gases

QGO21 may only be used in conjunction with AGO21
Caution - risk of burns!

There is a risk of burning since the measuring cell works at an operating
temperature of 700 °C and other accessible parts can get very hot too (>60 °C)

To prevent injury caused by the hot sensor tube, remove the QGO21 from the
AGO21 mounting flange only after the equipment has cooled down
Oxygen Sensor QGO21...
1 Safety notes
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CC1P7845en
06.12.2017