Econox CarboProbe CP Plus Manuel d'utilisation - Page 7
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There is no cold junction ambient temperature compensation in the meter, so the reading
must be corrected for room temperature. This can be approximated by measuring room
temperature separately then adding the thermocouple voltage corresponding to the room
temperature.
Example, for an R-type thermocouple:
Ambient temperature is 25°C and meter indicates probe thermocouple signal 8.5 mV
Thermocouple chart (see section 4) shows 25°C corresponds to 0.14 mV
8.5 mV + 0.14 mV = 8.64 mV, which corresponds to 856°C from chart
Hence probe temperature = 856°C
Thermocouple test
Prolonged exposure (hundreds of hours) to high temperature (over 1500°C) causes
evaporation of platinum. The thermocouple can be tested for open circuit or thinning that
may lead to failure.
Swap the positions of the yellow and green wires in the meter. Select "TEST" position. The
reading should be less than 0.005. A reading of 1 indicates that the thermocouple is either
broken or may soon do so. This test should be done at room temperature.
3. Repairing the sensor
CarboProbe sensors are highly technical measuring instruments subjected to potentially
difficult work conditions. The lifespan of a given sensor depends, to a large extent, on the
conditions in which it is used.
When sending a sensor for repair, pack it carefully in its original packaging, mark it "Fragile
Instrument", and return it to:
X:\Fiches tech. - Normalisation\ECONOX\Normalisation\Mode d'emploi\PDF\sonde
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Kent, Ohio 44240
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