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INSTRUCTION FOR USE
Hygrometers serve to
measure the relative air humidity. The concept “relative humidity”
means that the air depending of the temperature prevailling at the time,
i. e. in relation to it, may receive resp. contain different quantities
of humidity. If the air temperature drops at unchanged water content of
the air then the “relative humidity rises, and conversely. Temperature
and air humidity exert great influence on the physical wellbeing.
Therefore these two parameters should be given special notice in
dwelling and working rooms.
The Synthetic Hair
Hygrometer is for that very reason a precision instrument.
Contrary to the spiral hygrometer, which theoretically indicates only
correctly at a certain point of the scale, the synthetic hair hygrometer
can be adjusted in such a way that it indicates reliably over the total
scale range due to its construction.
Putting into
service:
To
enable an exact function of the device, the choice of the measuring
place is of particular importance. When measuring in the open air, the
device must be put on a spot protected from solar radiation and wind.
The device should be placed in dwelling and working rooms at a spot
with steady temperature and free from the influence of any heaters.
Our synthetic hair
hygrometers are produced and adjusted with the utmost care.
Shocks during transport
or longer storing in dry rooms may in a particular case cause
alterations in the sensitive measuring part and influence the indicating
accuracy. This may also occur after longer use in heated rooms with
extremely dry air.
A regeneration of the
hygrometer is to be recommended in both cases. This happens by wrapping
the device in a wet towel for about 1/2 hour. After this time the
hygrometer must indicate a relative humidity of max. 95 - 98 %.
Deviations can be corrected by turning the adjusting screw with a
small screw driver. The adjusting screw is visible through a small hole
in the back of the housing.
A SIMPLE REGENERATION
is possible by storing the device several hours in wet atmosphere for
instance in bath rooms, wash-houses or in the open air on humid foggy
days. Should you want to control the synthetic hair hygrometer in
comparison with other devices then it is essential that all devices are
put at the same place closely together, It should be noticed that considerable
variations of the air humidity are being possible at different
measuring points within closed rooms.
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