4
OPERATION
2.3 CHECKING SAMPLE TEMPERATURE
For an accurate measurement, the sample temperature (Ts) should be close to the
sample block temperature (Tb). WP4C displays the temperature difference in the sample
temperature screen.
If a sample is warmer than the sample chamber (Ts-Tb is a positive number), condensation
may occur and moisture may condense inside the block, which will adversely affect readings.
If a sample is colder than the sample block temperature (Ts-Tb is a negative number), the
WP4C will wait to start a reading until its temperature increases to 1 °C below sample block
temperature. The closer the sample temperature is to the sample block temperature (i.e.,
closer to equilibrium), the less time is need for a reading.
To ensure the sample is at the correct temperature, use the following steps.
1. Place the sample in the chamber and close the drawer.
2. Press the lower right button to access the sample temperature screen and view the
temperature difference.
3. If the sample temperature difference is between −0.5 and 0, the sample can be used to
begin a reading (Section2.3).
If the sample temperature difference is a positive number, remove the sample
immediately.
4. Set the sample on a cold surface and cover with the cup lid to preserve the moisture.
Leave for approximately 1 min.
Do not cool the sample too much or the equilibrium time will be lengthened.
5. Place the sample back in the chamber and note the temperature difference again.
If it is between −0.5 and 0, begin the reading (Section2.4).
2.4 TAKING A READING
Observe the following cautions and use the following steps to take a reading.
CAUTIONS
• Ensure that the physical temperature of the WP4C is between 5 °C and 40 °C.
• Do not measure a sample that has a temperature greater than the WP4C chamber
(Section2.3). Remove the sample until it is at room temperature.
• Do not move the sample drawer too quickly when loading or unloading samples to avoid
spilling.
• Never try to move the instrument after a sample is loaded. Movement may cause the
sample material to spill and contaminate the sample chamber.
• Never leave a sample in the WP4C after a reading has finished. The sample may spill and
contaminate the instrument chamber if the instrument is accidentally moved or jolted.
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