12
13
F
%RH
I
F
td
%RH
J
5. Measurement mode
CAUTION: Do not submerge the probe in a liquid or powder or else damage
to the probe may occur. Probe is for ambient air use only.
Each time you turn on the meter it will enter the measuring mode after it
displays a test screen and the temperature sensor offset value. The measuring
mode lets you measure temperature, % relative humidity, and dewpoint
(dewpoint readings are available with model WD-35612-10 only).
Measuring humidity:
1.
Press ON
to power up meter. The LCD
test display appears for 1 second.
Next, the temperature sensor offset
value will appear for 2 seconds.
2.
The meter displays the percent relative
humidity and the temperature detected
by the probe.
See figure
3.
Move the probe around or cover the
end with your hand to see the tempera-
ture and relative humidity change.
If this does not happen, and/or you
receive an error message, see page 21
for an explanation of error messages
and what actions you need to take.
1.
Calibrate the meter for humidity if
needed (see pages 10-12 for directions).
2.
While in humidity measurement mode,
press NEXT
. The meter will show “td”
to the lower left of the humidity display
to indicate dew point measurement
mode. The lower display will show the
dew point temperature.
See figure
3.
Press NEXT
to return to humidity
measurement.
Measuring dewpoint
(model WD-35612-10 only)
:
I
J
Fast humidity calibration:
Follow the directions below to calibrate humidity more quickly. Please note that
using this calibration method may result in an accuracy slightly less than specifica-
tion. If you want to ensure the highest possible accuracy, follow the “Automatic
Humidity Calibration” directions on pages 10-11.
1.
Place the meter, probe, and calibration
salt bottles in a place where the
temperature is constant.
2.
Press OFF.
3.
Press ON and PRG simultaneously
and hold until the screen displays
“CAL”.
Release the keys. The screen
displays the temperature offset value.
See figure
CAUTION:
Be careful when inserting
the sensor probe into the calibration salt
bottles. Rough movement may damage
the bottle.
4.
Gently open the cover of the 33% RH
calibration salt bottle and carefully
insert the probe into the bottle.
The probe will hit a stopper when
it is fully inserted.
5.
Press RST twice.
The meter will
beep each time the key is pressed.
The meter is now in low RH point
calibration mode.
See figure
6.
Wait until the low RH reading stabi-
lizes. Press PRG to save the calibration
value. The meter automatically moves
to high RH point calibration.
See figure
7.
Gently open the cover of the 75% RH
calibration salt bottle and carefully
insert the probe into the bottle.
The probe will hit a stopper when
it is fully inserted.
8.
Wait until the high RH reading stabi-
lizes. Press PRG to save the calibration
value and return to measurement mode.
MIN
%RH
G
G
MAX
%RH
H
H
F
F
