USER’S GUIDE_______________________________________________________________________
10 _____________________________________________________________________U376EN-1.1
Maintenance
Replacing the probe
The probe can be changed easily. All the calibration electronics are in
the probe, which can be disconnected without disconnecting wires. If
the probe is integrated into the transmitter housing, open the cover,
loosen the tightening screw on the transmitter body (see page 3) and
pull out the probe. The remotely installed probe is disconnected from
the cable by loosening the clamping sleeve of the connector. The new
spare probe is automatically identified by the control electronics of the
transmitter.
NOTE
Disconnection of the probe causes an error and relay activation (ON).
Calibration checking
It is recommended to perform a calibration checking every second
year. A simple field calibration checking can be performed by using a
calibrated reference probe. During the checking procedure, please
avoid exhaling towards the probe as this alters the CO
2
concentration.
1. Check the current transmitter reading.
2. Replace the probe with the reference.
3. Let the transmitter stabilize for a few minutes. The measured CO
2
concentration near by the transmitter may have increased due to
breathing. This is assumable especially in case of the integrated
probe.
4. Compare the readings measured with the original and the
reference probe.
If there is need for re-calibration / adjustment of the probe, please
contact Vaisala or Vaisala’s representative.
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