Hanna-instruments HI 8064 User Manual download pdf (Page 4)

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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.

Calibration procedure

• Bring the calibration kit to a temperature of

approximately 20 ºC.

• Remove the plug from the chamber contain-

ing the LiCl solution and insert the probe.

• Remove the adhesive sticker which covers

the calibration trimmer access holes.

• Wait for the reading to stabilize (this will take

a few hours) and then turn the "Low humidity

trimmer" (the one nearest to the probe con-

nection cable) until the value of 11.1% RH will

be displayed on the LCD.

• Remove the probe and tightly seal the cham-

ber containing the LiCl solution.

• Remove the plug from the second chamber

and insert the probe.

• Wait for the reading to stabilize and then note

the displayed value.

• By using the Calibration Table (pages 8-9),

find the displayed readout value on column

"A" and the corresponding RH value of col-

umn "B", to which the meter has to be brought

by acting on the "High humidity trimmer".

• Adjust the "High humidity trimmer" (the one

opposed to the connection cable) until the

required value is displayed on the LCD.

• Finally adjust the "Low humidity trimmer" until

the value of 75.4% RH will be displayed on the

LCD.

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.

TEMPERATURE CALIBRATION

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