How can the MTC695 be unblocked when reading wrong temperature values with the KF1000?

Document ID

Document ID TE11835

Published Date

Published Date 08/29/2019
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Question
How can the MTC695 be unblocked when reading wrong temperature values with the KF1000?
Summary
One possibility to unblock the electrode is to short cut the two platinum staples with a metallic conductor.
The other possibility is to increase the solvent conductivity by adding a small amount Karl Fischer titrant.
Answer
In KF applications, MTC695 works in imposed current mode (it imposes current and reads voltage). In this mode, if the electrode is on air (not submerged in the sample to analyse for example) voltage reading can be high/low enough to saturate the inputs of the Analog to Digital Converter.
If the inputs of the Analog to Digital Converter (ADC) are saturated, temperature reading can be affected and wrong. When this situation is detected, MTC695 sets temperature value to -15ºC or 110ºC to indicate clearly that temperature measurement is not valid (setting a value out of specifications range).
When ADC goes out of saturation, temperature readings are correctly recovered.
Add just a small drop of titrant from the burette, that is usually enough to change the resistance of the solution, and then the temperature will start reading correctly and the electrode will allow the KF1000 to work properly. Another possibility to unblock the MTC695 (and the KF1000), it to short circuit the two platinum stapled with a metallic conductor.

 

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