4
EN
thermohygrometer BZ21M
Technical data
Parameter
Value
Model
BZ21M
Relative humidity measuring
range
20 to 100 % RH
Temperature measuring range -10 to +40 °C
Saturation humidity measuring
range
3 to 50 g/m³
Absolute humidity measuring
range
2 to 50 g/m³
Accuracy
Humidity: ± 3 % RH
(20...100 %), +1 scale
graduation
Temperature: ±2 °C
Operating and storage
conditions
-20 to +50 °C at 0 to
100 % RH
Dimensions
Ø 130 mm / height 28 mm
Weight
185 g
Housing material
Stainless steel
Transport and storage
Note
If you store or transport the device improperly, the
device may be damaged.
Note the information regarding transport and storage of
the device.
Transport
The manufacturer packed the device to the best of his abilities
to protect it against transport damage.
Storage
When the device is not being used, observe the following
storage conditions:
•
Dry and protected from frost and heat
•
Protected from dust and direct sunlight
•
The storage temperature is the same as the range given in
the Technical data chapter.
Operation
Before positioning the device, observe the following:
•
Do not expose it to direct sunlight.
•
Do not position it directly above a heater.
•
If possible, position it at an interior wall; avoid cooler
exterior walls.
Tips and notes on the humidity level in living spaces
General information
:
Medical studies of recent years have demonstrated that an
increased indoor humidity level of well above 50 to 60 % RH
promotes asthma and allergies. A low relative humidity of 30 to
40 %, on the other hand, is harmless. Occasionally, the relative
humidity level in flats with a good air exchange can even drop
below 30 % during harsh winters without being detrimental to
human health.
For the most part, it is the residents themselves who determine
the humidity level in their living spaces during the heating
period from October to April. A household of 3 to 4 persons
emits about ten litres of water vapour into the room air every
day, inter alia by taking showers, washing, cooking and
breathing. As modern window seals are very tight to save
energy costs and provide noise protection, this large amount of
humidity must be released to the outside by airing several times
a day.
The type of heating and ventilation determines the average
relative humidity level in a flat during the winter. Since cold air
always has a lower absolute moisture content than normal room
air, the humid air can easily be exchanged by fresh, dry air in
the winter by repeated brief and intensive airing throughout the
day. Every living space that is not equipped with a ventilation
system requires air changes several times a day, depending on
the occupancy and moisture emission.
