HH-70_v01-UK_FR_DE_IT_SP_DK
1
ENGLISH
INSTRUCTIONS
FOR USE HH-70
SYNTHETIC
HAIR
HYGROMETER
GENERAL
Hygrometers serve to measure the relative
humidity. The concept “relative humidity” means
that the air depending of the temperature prevailing
at the time, i.e. in relation to it, may receive
respectively contain different quantities of
humidity. If the air temperature drops at unchanged
water content of the air then the relative humidity of
the air 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
the 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 in a spot within 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 ½
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 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.