15
The humidity test procedure is as follows:
1. Read through the whole procedure before doing anything.
2. Put a level teaspoon of Magnesium Chloride in the bottom of one chamber and the
same amount of Sodium Chloride in the bottom of the other. Be very careful not to
contaminate the two salts with each other. Label the 2 chambers.
3. Put a few drops of the pure water onto the salts to make a paste, there should be
plenty of undisolved salt but none of it should be dry. The level of the paste should
be well below the side hole where the sensor is to be inserted, if any paste gets into
the side hole then clean the chamber in running water, dry and start again.
4. Put both the top and side lids on the chambers and leave them on a level surface in
a constant temperature environment for at least 2 hours.
5. Insert the 765 sensor probe into the side hole of the Magnesium Chloride chamber,
push it all the way in. A support stand is provided to place under the unit so that it
and the sample chamber are level. Be sure not to get any paste on the sensor.
6. Leave for at least 2 hours, preferably overnight, in the constant temperature
environment. The 765 does not have to be on.
7. Take a humidity reading, it should be within 3.5% of the expected reading (see
below).
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