54
7 Maintenance
WARNING!
Risk of poisoning by carbon monoxide!
Carbon monoxide is a poisonous gas. Inhalation can cause severe poisoning symptoms an
can be fatal.
Perform the calibration quickly and only in open, well-ventilated rooms, ideally underneath
an exhaust hood.
Do not open the valve on the test gas cylinder until shortly before calibration and close it
immediately after calibration!
WARNING!
Danger of burns!
Probe becomes hot during operation.
If the probe is operated when removed, there is a danger of burns on the probe housing.
Never lay the probe on flammable material and heat it up.
Wear protective gloves
7.1.5 Checking/Calibrating with Reference Measurement
• The system must be in operation (ideally at the desired operating point).
• Perform the calibration as described in Chapters 6.4.2 Calibrating the O
2
Electrode and
6.4.3 Perform a Calibration of the CO/H
2
Electrode .
7.1.6 Simple Function Test of the CO/H
2
Electrode
WARNING!
Danger of burns!
If a dismantled probe is operated, there is a danger of burns if touching the probe’ s housing.
Never lay the probe on flammable material and heat it up.
Wear protective gloves
1. Dismantle the probe
2. Fill isopropyl alcohol in a glass (approx. 1 cm)
Alternatively, use brandy/perfume / etc.
3. Hold the probe without the GED upside down into the glass.
Do not immerse!
NOTICE
An additional possibility is to purge the probe with test gas containing CO, NO, H
2
, etc.
Some ppm are enough.
If the probe is OK, this immediately reacts with a considerable increase in the probe voltage
(CO
e
value) respective to the probe dynamic response.
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