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13 maintenance – General Tools and Instruments LRTH185DL User Manual

Page 19

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13 Maintenance

„ Do not use the meter in an environment with severe

change; do not store the unit in an environment with
high temperature, high humidity, and high vibration

„ Take battery off if the meter has not been used for a

long period of time

„ The

Diode

temperature probe is used to measure

temperature and the capacitive humidity sensor is
used to measure take humidity

„ The thermocouple and humidity sensor will start

aging under the influence of oxidation, reduction,
corrosion, pollution, vaporization, diffusion or other
metallurgy. The aging process will affect its precision
seriously.

„ Cleaning and inspection of temperature probe:

The smoke, coal, dust, grease attached on the

protective tube of temperature probe will slow down
the heat conduction of the thermocouple and cause
measuring error. Therefore, it should be cleaned
periodically. The metal coating of thin thermocouple
should be replaced properly upon the occurrence of
corrosion.

„ Cleaning and inspection of humidity sensor:

The smoke and dust attached on the humidity sensor

will slow down the function of humidity sensor and
cause measuring error. Therefore, it should be
cleaned periodically. Blow off the dust with mild
compressed air instead of water or alcohol. The
aluminum plate inside the humidity sensor should be
replaced upon the occurrence of corrosion.