User Guide

7
Temperature Calibration
The HI 8064 thermohygrometer is factory cali-
brated and therefore usually it requires no fur-
ther intervention by the user.
If recalibration is desired, proceed as follows:
• Remove the adhesive sticker which covers
the calibration trimmer access holes.
• Insert the probe into a recipient in which air
heated at a temperature of 50 ºC has been
forced to circulate.
• Insert a thermometer with an accuracy of 0.1
ºC into the same recipient.
• Read the temperature value on the thermom-
eter.
• Adjust the temperature calibration trimmer
(the central trimmer) until the measured tem-
perature value is displayed on the LCD.
TAKING MEASUREMENTS
• For a rapid response, expose the end of the
humidity detector to an air current moving at
more than 0.5 m/second.
In absence of air movement, the response
can be speeded up by shaking the probe.
• If condensed drops form upon the surface of
the humidity sensors, turn the instrument off
and wait until this undesired water has com-
pletely evaporated. To speed up the evapora-
tion process, expose the humidity sensors to
an air current.
• If the meter is used in dusty surroundings, the
filter must be kept on at all time.