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thermohygrometer BZ21M
Reading the relative humidity, temperature, saturation
humidity and absolute humidity
After the device has been situated in the room for some hours,
you can read the relative humidity, temperature, saturation
humidity and absolute humidity on the dial.
1. Read the room temperature on the right side of the dial (1).
2. Read the relative humidity level on the left side of the
dial (4).
3. Read the saturation humidity on the right side of the
dial (2, inner scale). The saturation humidity value
describes the amount of water vapour the air can absorb at
a certain temperature (highest possible value of absolute
humidity). As the temperature rises, the absorption
capacity of the air increases.
4. Read the absolute humidity value at the intersection of the
two pointers (3). The absolute humidity value describes the
amount of water vapour that is actually present in the air.
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2
3
4
Maintenance and repair
Adjusting the hygrometer
If the hygrometer displays a deviating humidity value e.g. during
a reference measurement, the set screw at the side of the
device can be used to adjust the indication.
In addition, the device should be moistened once a year. This is
recommended in particular after longer periods with a low
humidity level. To do so, wrap the entire device into a damp,
warm cloth for approx. 30 minutes. It must then display 95 to
98 %. If the pointer is not within this range, the indication must
be adjusted.
Cleaning
Clean the device with a soft, damp and lint-free cloth. Make
sure that no moisture enters the housing. Do not use any
sprays, solvents, alcohol-based cleaning agents or abrasive
cleaners, but only clean water to moisten the cloth.
Repair
Do not modify the device or install any spare parts. For repairs
or device testing, contact the manufacturer.
Disposal
The device does not contain any electrical or electronic
elements. At the end of its life, please dispose of this device
according to the valid legal requirements.
