Instructions

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Key ◄/FUNC
◄ allows navigation through the menus.
FUNC: In normal view, it allows to select the statistical data: maximum, minimum, and average.
Key ▲
It allows navigation through the menus. During normal operation, it is used to select the resetting of
the statistical data and to scroll the displayed quantities.
Key ▼
It allows navigation through the menus. During normal operation, it is used to cancel the resetting
of the statistical data and to scroll the displayed quantities.
Key ►/UNIT
It allows navigation through the menus.
During normal operation, it changes the unit of measurement of the main quantity (HD21ABE17
only).
If the main quantity is Relative Humidity (HD21ABE17 only), 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 (HD21ABE17 only), by repeatedly pressing the UNIT key you
can display the temperature in °C (Celsius degrees) or °F (Fahrenheit degrees).