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BZ15C
EN
OPERATING MANUAL
THERMOHYGROMETER
TRT-BA-BZ15C-TC-001-EN
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Table of contents
Notes regarding the operating manual................................. 1
Safety .....................................................................................1
You can download the current version of the operating manual
and the EU declaration of conformity via the following link:
Information about the device................................................2
Transport and storage...........................................................3
Operation ...............................................................................3
Maintenance and repair ........................................................6
Disposal .................................................................................6
Notes regarding the operating manual
Symbols
Warning
This signal word indicates a hazard with an average
risk level which, if not avoided, can result in serious
injury or death.
Caution
This signal word indicates a hazard with a low risk
level which, if not avoided, can result in minor or
moderate injury.
Note
This signal word indicates important information (e.g.
material damage), but does not indicate hazards.
Info
Information marked with this symbol helps you to carry
out your tasks quickly and safely.
Follow the manual
Information marked with this symbol indicates that the
operating manual must be observed.
BZ15C
https://hub.trotec.com/?id=41521
Safety
Read this manual carefully before starting or using the
device. Always store the manual in the immediate vicinity
of the device or its site of use!
Warning
Read all safety warnings and all instructions.
Failure to follow the warnings and instructions may
result in electric shock, fire and/ or serious injury.
Save all warnings and instructions for future
reference.
This appliance can be used by children aged from
8years and above and persons with reduced physical,
sensory or mental capabilities or lack of experience
and knowledge if they have been given supervision or
instruction concerning use of the appliance in a safe
way and understand the hazards involved.
Children shall not play with the appliance. Cleaning and
user maintenance shall not be made by children
without supervision.
• Do not use the device in potentially explosive rooms.
• Do not use the device in aggressive atmosphere.
• Protect the device from permanent direct sunlight.
• Do not remove any safety signs, stickers or labels from the
device. Keep all safety signs, stickers and labels in legible
condition.
• Do not open the device with a tool.
• Observe the storage and operating conditions as given in
the Technical data chapter.
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Operating manual – thermohygrometer BZ15C
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Intended use
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2
Only use the device for indoor temperature and humidity
measurements within the measuring range specified in the
technical data. Observe and comply with the technical data.
To use the device for its intended use, only use accessories and
spare parts which have been approved by Trotec.
Improper use
Do not use the device in potentially explosive atmospheres, for
measurements in liquids or at live parts. Trotec accepts no
liability for damages resulting from improper use. In such a
case, any warranty claims will be voided. Any unauthorised
modifications, alterations or structural changes to the device are
forbidden.
Personnel qualifications
People who use this device must:
• have read and understood the operating manual, especially
the Safety chapter.
Residual risks
Warning
Risk of suffocation!
Do not leave the packaging lying around. Children may
use it as a dangerous toy.
Information about the device
Device description
The device BZ15C is a thermohygrometer for measuring the
indoor humidity level and temperature.
The device is particularly well suited for monitoring the humidity
level in garages. The scales on the dial are specially adapted to
this area of application.
Device depiction
Warning
The device is not a toy and does not belong in the
hands of children.
Warning
Dangers can occur at the device when it is used by
untrained people in an unprofessional or improper way!
Observe the personnel qualifications!
Caution
Keep a sufficient distance from heat sources.
Note
To prevent damages to the device, do not expose it to
extreme temperatures, extreme humidity or moisture.
No. Designation
1 Humidity scale
2 Temperature scale
Technical data
Parameter Value
Model BZ15C
Relative humidity measuring
range
Temperature measuring range 0 to +40 °C
0%to 100 %RH
Accuracy Humidity: ±3 % RH
Note
Do not use abrasive cleaners or solvents to clean the
device.
Operating and storage
conditions
Dimensions Ø 103mm / height 24 mm
(20...100%), +1 scale
graduation
Temperature: ±2 °C
-10 to +50 °C with 0 to 100%
RH
Weight 155 g
Housing material Stainless steel
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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 damages.
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 garages
Regardless of whether there is visible mould formation and a
musty smell due to an excessive humidity level or you suffer
from dry mucous membranes and stinging eyes because of an
insufficient humidity level – in living spaces, the effects of an
unsuitable indoor climate usually do not go unnoticed for long.
However, the situation is different in garages. Moisture is the
worst enemy of classic cars and motorcycles, most notably. A
supposedly safe garage provides protection against harmful
weather effects indeed, but not against the consequences of too
humid or too dry garage air.
Leather, for instance, requires a certain humidity level to be able
to breathe, or else it will become brittle. If the air is too dry,
seals lose their elasticity and cable connections may break.
A relative humidity between 45and 50% is considered the ideal
range for an adequate storage of motor vehicles worthy of
preservation.
A 10°C temperature drop in the garage at night, however,
quickly makes the relative humidity of the garage air increase
by more than 30 %.
Similarly, after driving in the rain in the summertime, the
relative humidity level in the closed garage can easily reach – or
exceed – the 90% threshold due to the residual water left on
the vehicle as well as the additional heat emitted by the motor
that is still hot.
The results include destructive corrosion and mould growth.
Therefore, the objective should be to keep both the relative
humidity and the temperature at an ideal level all year round.
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.
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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.
A limitation of the relative humidity to prevent too high humidity
levels is only required during the heating period starting in
autumn. It is recommended to maintain a temperature of
approx. 20°C in the entire flat.
In winter:
In case of average outside temperatures below approx.+5°C,
sufficient air changes and a room temperature of approx.20°C,
a relative humidity level between 40 and 50% can easily be
obtained. If it exceeds 50%, the room should be ventilated.
During frost periods, an indoor humidity level of less than
40%RH is perfectly normal. The upper limit of 40 to 50%RH
(at approx. 20°C) needs to be observed particularly in old
buildings with little thermal insulation, as exceeding this value
for a prolonged time increases the risk of mould formation.
In autumn or spring:
At milder outside temperatures between 5 and 15°C on
average, the humidity level may reach 50 to 60%RH.
Please note:
Relatively speaking, warmer rooms are drier and colder rooms
get more humid. This is why it is recommended to maintain a
room temperature of at least 16°C.
Correct airing:
If your window panes mist up frequently or mould starts to grow
on walls, it is high time to review and, if necessary, break your
old habits. The answers to the following questions can be
useful:
• How often should I air out?
Whenever the hygrometer scale exceeds the colour range
that corresponds to the room temperature, it is a good idea
to air out the room.
• For how long should I air out?
During the winter, at temperatures below approx.+5°C, a
maximum of 5minutes should be sufficient. If the outdoor
air is warmer (5 to 15°C), about 10 to 15minutes of airing
are required.
• How should I air out?
An effective air exchange can only be obtained by leaving a
window or window door in the room wide open. It is not
necessary to create a draught. Airing a room by tilting a
window or door over an extended period of time is
generally insufficient and a waste of energy, especially
considering that the affected room will cool down much
more over time if the temperatures are low.
• What should I do if I am not at home during the day?
Airing your rooms sufficiently while you are at home will
do. Ideally, this means airing out once every morning
before you leave, once when you come home, and once
before you go to bed. It is equally important not to switch
off the heating completely during the day (16 to 18°C).
• Should I also ventilate in case of fog or rain?
This is certainly recommendable. Even very moist, cold air
always has a lower moisture content than normal indoor
air. Besides, you also need a sufficient supply of fresh air
when the weather is damp.
• What do I have to note in the summer?
Except for the basement, you can air out all rooms as
needed. There is no limitation on the hygrometer scale; the
humidity level always corresponds to the outdoor climate.
This is not harmful since the walls (except basement walls)
are usually warm enough to prevent the temperature from
falling below the dew point in normal living areas, and thus
to avoid the formation of condensation e.g. on wall
surfaces, which would promote mould growth.
• How should I air out basement rooms?
Basement rooms are at risk in the summer because during
this season the warm outdoor air contains much moisture,
which precipitates on cold surfaces. In semi-basement
flats, too, airing should be avoided at outside temperatures
above approx.15°C.
• Can I dry laundry in the flat?
The ideal solution is a drying room that can be aired out
permanently (even in the summer or in case of frost). Apart
from that, laundry may only be dried in the flat if the room
is closed and very well heated. The room should be aired
out intensively several times during drying.
• Other rooms
In rooms that are not used as living spaces, or that neither
have a window, nor a forced ventilation or heating system
(garages, pantries, storage rooms etc.), it may be
necessary to actively stabilise or control the climate using
dehumidifiers, air conditioners or heating devices.
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Information regarding the hygrometer
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2
The measurement accuracy is +/-3%RH in the range from 20
to 100%RH. The hygrometer's measuring element is a
specially pre-treated synthetic fibre which, unlike real hair,
guarantees a high measurement accuracy without requiring
maintenance.
Please note that the hygrometer must not be exposed to hot
water or water vapour, otherwise the measurement accuracy
can no longer be guaranteed. If deviations occur in comparative
measurements carried out with a reference device, the
hygrometer indication can be corrected, see chapter
Maintenance and repair.
Reading the humidity level and temperature
After the device has been situated in the room for some hours,
you can read the humidity level and temperature on the dial.
The colour scale on the device is specially adapted to the
garage climate.
If the humidity level is 35% RH or below, the garage air is
usually too dry for leather and plastics. This can result in brittle
leather, porous seals and cable breaks. Therefore, the pointer is
located in the red range in this case.
To avoid rust, corrosion and mould formation, the humidity level
should not be higher than 45 to 50%RH – i.e. the green range.
At a relative humidity of only about 55%RH metal begins to
corrode, and moisture accumulations can no longer dry out
properly. At 70%RH and above, mould finds an ideal breeding
ground after only a few hours – this is why these critical ranges
are also highlighted in red on the colour scale of the BZ15C.
1. Read the room temperature on the lower dial (2) and
match this temperature with the corresponding colour
range.
2. Now read the relative humidity level on the upper dial(1).
Colour range Humidity Temperature
Red range 0 − 35% and
60 − 100%
Orange range 35 − 40% and
55 − 60%
Yellow range 40 − 45% and
50 − 55%
0 − 8 °C and
28 − 40 °C
8 − 12 °C and
24 − 28 °C
12 − 14 °C and
20 − 24 °C
Green range 45 – 50% 16 – 20 °C
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An overview of the possible effects is provided in the diagram
below:
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.30minutes. 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. Ensure
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 relevant legal requirements.
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Trotec GmbH & Co. KG
Grebbener Str. 7
D-52525 Heinsberg
+49 2452 962-400
+49 2452 962-200
info@trotec.com
www.trotec.com
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