19
18
Digital Thermo-Hygrometer
B 3:
°C/°F /
▼
button
B 4:
MAX.MIN /
▲
button
C: Housing (Fig. 2+3):
C 1:
Sensor buttons
C 2:
Signal light
C 3:
Mounting hole
C 4:
Stand (fold out)
C 5:
Battery compartment
7. Getting started
• Open the battery compartment.
• Insert two new 1,5 V AAA batteries, polarity as illustrated.
• All segments will be displayed briefly. On the display appear the
measured temperature and humidity.
• Close the battery compartment again.
8. Operation
• The device will automatically quit the setting mode if no button
is pressed for 10 seconds.
8.1 Temperature display
• Press the
°C/°F /
▼
button to change between °C (Celsius) or °F
(Fahrenheit) as temperature unit.
8.2 Dew point
• To toggle the display between dew point and temperature press
the DEW POINT button in normal mode.
• The interdependency of temperature and relative humidity is
expressed by means of the dew-point:
Digital Thermo-Hygrometer
• When air is cooled down continuously at a constant absolute
humidity, then the relative humidity will steadily increase up to a
maximum of 100%. If the air is cooled further, then the excess
water vapour is extracted from it in the form of water droplets.
• If the measuring unit indicates an air temperature of 20 °C and a
relative humidity of 65%, then the dew-point temperature will be
13.2 °C. This means that the air in a room will condense and
form water droplets on walls and ceilings in whichever spot that
is cooler than 13.2 °C, and that this may later lead to patches of
mould or damp.
• If the air is at a relative humidity of say 40%, then the dew-point
temperature is only 6 °C. The walls and ceilings would therefore
have to be significantly colder for the air to reach its dew-point
and for water droplets to from.
8.3 Maximum and minimum values
• Press the
MAX.MIN /
▲
button.
• MAX appears on the display.
• The maximum values measured since the last reset appear on
the display.
• Press the
MAX.MIN /
▲
button again.
• MIN appears on the display.
• The minimum values measured since the last reset appear on
the display.
• Press the
MAX.MIN /
▲
button again, to go back to the display
of the present values.
8.3.1 Reset to the current values
• Press and hold the
MAX.MIN /
▲
button when the maximum or
minimum values are displayed to reset the corresponding values.
TFA_No. 30.5046_Anleitung 20.12.2017 17:35 Uhr Seite 10
