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9
The "UNIT" key is used for the following functions:
• UNIT: by pressing this key the unit of measurement of the main input quantity is selected: the
unit of measurement will appear in the upper part of the display; the measured value will be
displayed in the central line. By repeatedly pressing the UNIT key, the desired unit of
measurement can be selected between the following:
1. %RH % of relative humidity
2. g/m
3
Grams of vapour in a cubic meter of dry air
3. hPA Partial vapour pressure (hPa)
4. Td Dew point (°C or °F)
By now pressing UNIT, the %RH unit of measurement is displayed again in the comment line
and, simultaneously, the unit of temperature measurement blinks. Use the and arrows, if
you wish to change the temperature display from degrees Celsius (°C) to degrees Fahreneit (°F),
or vice-versa. Confirm by pressing the UNIT key or wait for the unit of measurement to stop
blinking (about 15 seconds timeout).
• MENU: in the menu two items can be set (see chapter 3):
1. Probe type
2. Probe calibration
- the menu is opened by pressing simultaneously DATA+UNIT: the first item of the instrument
programming menu will appear;
- use the and arrows (respectively located above the HOLD and REL keys) to modify the
displayed value;
- press DATA/ENTER to confirm the modification and go onto the next item;
- press CLR/ESC to cancel the modification;
- to exit the menu, press the UNIT/MENU key again.
The "REL" key is used for the following functions:
• REL: it displays the difference between the current value and that measured on pressing the key
for both measurements: main and secondary. The "REL" message is displayed on the left. To
return to the normal measurement, press the key again.
• : once the MENU has been opened with the DATA+UNIT keys, the key will allow to
decrease the value of the selected parameter.
REL/ key
UNIT/MENU key
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