RADIOMETER TCM3 - Page 35

TCM3 and TCM30 Service Manual 2. TCM3
Electrode Performance Check
Introduction
Heating, Signal
Range and
Stability
Heating
annene 1
This procedure is intended for the following electrodes: E5237 (pCO,), E5247
(pO2), E5277 (pO/pCO») and E5280 (pO./pCO, solid state).
The electrode performance check is to be performed in case of a malfunction for
troubleshooting, and upon completion of a service repair for verifying the .
electrode performance. The check results should be documented in the table at the
end of this paragraph. The results should be filed for future reference.
The following instruments and accessories are required (and assumed to be OK):
TCM3 monitor
TCC3 or A7450 calibration unit
CALI gas (green) (5% CO,, 20.9% O,), part no. 962-107
CAL2 gas (blue) (10% CO:, 0% O:), part no. 962-098
Accessory kit, i.e.
For E5237: D824, part no. 904-309
For E5247: D826, part no. 904-308
For E5277 and E5280: D280, part no. 904-892
Before the performance check it is recommended to remembrane the electrode
unless you want to check an error diagnosis. If so, it is recommended to test the
electrode twice. First with the original membrane, secondly, with a new
membrane.
Tf the old membrane has been mounted on the electrode for a long time and the
electrolyte has dried out, the electrode should be cleaned with distilled water and
rubbed thoroughly with the cleaning paper. Never use emery paper or similar.
These checks are performed during a normal calibration procedure.
Refer to the standard procedure as described in the Operator's Manual. Preset the
temperature to 45 °C. Use the Green calibration gas.
The preset temperature (+ 0.05 °C) must be reached within three minutes. If not,
ERROR 1 will be flashing in the AUX display and an acoustic beep will be heard.
This error may be provoked if the ambient temperature is below the specified
minimum temperature of 15 °C.
If the electrode temperature sensing system is defective, i.e. the temperature
sensors or their connections, ERROR 10 or 11 (displayed in the pO,/pCO,
displays + continuous acoustic alarm for five seconds) may be called. However,
these errors are normally caused by a defective or mis-aligned monitor.
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