Instructions

- -
13
3.1 “►/UNIT” KEY FOR THE UNIT OF MEASUREMENT
It allows navigation through the menus. During normal operation, it changes the unit of
measurement of the main quantity (solo HD21ABE17).
If the main quantity is Relative Humidity (solo HD21ABE17), by repeatedly pressing the UNIT
key you can display the following quantities:
RH
Relative Humidity (%)
Td
Dew Point (°C - °F)
AH
Absolute Humidity (g/
m
3
)
r
Mixing Ratio (g/kg)
Tw
Wet Bulb Temperature (°C - °F)
H
Enthalpy (kJ/kg)
If the main quantity is Temperature (solo HD21ABE17), by repeatedly pressing the UNIT key you
can display the temperature in °C (Celsius degrees) or °F (Fahrenheit degrees).
3.2 THE MAXIMUM, MINIMUM AND AVERAGE VALUES OF THE CAPTURED QUANTITIES
By pressing the ◄/FUNC key you can display the maximum, minimum, average (AVG) or average
in 1 minute (AVG 1min) values of the measured quantities.
To reset the statistical data (except for AVG 1min function) press the ◄/FUNC key until the
“Reset? Yes No” message appears. Select Yes using the ▲▼keys, and confirm with ENTER.
Once selected, for example max, all displayed quantities indicate the maximum value. The AVG
average is calculated on the first five minutes of samples, and then on the current average.
THE AVERAGE IN 1 MINUTE FUNCTION
By pressing the ◄/FUNC key you can select the AVG 1min (Average in 1 minute) function:
Function: AVG 1min
READY 00:00:60
Carbon Dioxide
CO
2
600
ppm
CO 0 ppm
Patm 1000 hPa
RH 25.0 %
T 17.0 °C
If the function is selected, the " READY 00:00:60 " indication on the LCD blinks to prompt the
user to start the 1 minute average calculation of the acquired values.
To start the calculation, press the ENTER key. The " RUNNING " indication and a countdown will
appear on the display. During calculation, the instrument continuously emits one short beep per
second.