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Operating Instructions
Thermo-Hygrometer with CO
Item No. 2804759
1 Intended use
This product is an air quality monitor that measures the indoor temperature, humidity and concentration of
carbon dioxide (CO
) in the air. The readings are displayed in a coloured LCD screen. The product features a
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CO
concentration alarm function. The product is suitable for indoor environments, such as bedrooms, living
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rooms, kitchens, offices. The product is powered via USB-C
The product is intended for indoor use only. Do not use it outdoors. Contact with moisture must be avoided
under all circumstances.
If you use the product for purposes other than those described, the product may be damaged. Improper use
can result in short circuits, fires, injuries or other hazards.
The product complies with the statutory national and European requirements. For safety and approval
purposes, you must not rebuild and/or modify the product.
Read the operating instructions carefully and store them in a safe place. Make this product available to third
parties only together with the operating instructions.
All company names and product names are trademarks of their respective owners. All rights reserved.
USB4
, USB Type-C
and USB-C
are registered trademarks of USB Implementers Forum.
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2 Delivery content
Product
USB cable (USB-A to USB-C
)
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3 Latest product information
Download the latest product information at
the instructions on the website.
4 Description of symbols
The following symbols are on the product/appliance or are used in the text:
The symbol warns of hazards that can lead to personal injury.
5 Safety instructions
Read the operating instructions carefully and especially observe the safety information.
If you do not follow the safety instructions and information on proper handling in this
manual, we assume no liability for any resulting personal injury or damage to property.
Such cases will invalidate the warranty/guarantee.
5.1 General information
The device is not a toy. Keep it out of the reach of children and pets.
Do not leave packaging material lying around carelessly. This may become dangerous playing material
for children.
If you have questions which remain unanswered by these operating instructions, contact our technical
support service or other technical personnel.
Maintenance, modifications and repairs must only be completed by a technician or an authorised repair
centre.
5.2 Handling
Please handle the product carefully. Jolts, impacts or a fall even from a low height can damage the
product.
5.3 Operation
If it is no longer possible to operate the product safely, take it out of operation and protect it from
any accidental use. DO NOT attempt to repair the product yourself. Safe operation can no longer be
guaranteed if the product:
– is visibly damaged,
– is no longer working properly,
– has been stored for extended periods in poor ambient conditions or
– has been subjected to any serious transport-related stresses.
5.4 Operating environment
Do not place the product under any mechanical stress.
Protect the product from extreme temperatures, strong jolts, flammable gases, steam and solvents.
Protect the product from direct sunlight.
Never operate the product in direct proximity of strong magnetic or electromagnetic fields or transmitter
aerials or HF generators. Doing so can prevent the product from functioning properly.
5.5 USB cable
As power supply, only use the included USB cable with a compatible USB power adapter (not included).
If the USB cable is damaged, it must be replaced with a cable of the same type.
The mains outlet must be located near to the device and be easily accessible.
Make sure that the USB cable is not squeezed, bent, damaged by sharp edges or put under mechanical
stress.
Ensure that cables are not pinched, kinked or damaged by sharp edges.
index
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.
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Operating instructions
www.conrad.com/downloads
or scan the QR code shown. Follow
5.6 (Rechargeable) batteries
Correct polarity must be observed while inserting the (rechargeable) batteries.
The (rechargeable) batteries should be removed from the device if it is not used for a long period of time
to avoid damage through leaking. Leaking or damaged (rechargeable) batteries might cause acid burns
when in contact with skin, therefore use suitable protective gloves to handle corrupted (rechargeable)
batteries.
(Rechargeable) batteries must be kept out of reach of children. Do not leave (rechargeable) batteries
lying around, as there is risk, that children or pets swallow them.
All (rechargeable) batteries should be replaced at the same time. Mixing old and new (rechargeable)
batteries in the device can lead to (rechargeable) battery leakage and device damage.
(Rechargeable) batteries must not be dismantled, short-circuited or thrown into fire. Never recharge
nonrechargeable batteries. There is a risk of explosion!
6 Product overview
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3
2
1
1 Indoor temperature reading (°C or °F)
2 CO
concentration index
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3 Low battery icon
4 Detecting air quality icon
5 Backlight On/Off button
6 CO
concentration reading (ppm)
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7 Indoor relative humidity reading (%)
7 Power supply
The product is powered via a USB-C
power supply. You can install batteries for backup power to maintain
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the product settings in case the USB power supply is temporarely interrupted.
7.1 Installing batteries for backup power
Install batteries for backup power to maintain the product settings in case the USB power supply is
temporarely interrupted.
1. Push down the tab of the battery compartment cover to open it.
2. Insert the new batteries (3x 1.5 V AA batteries, not included) following the polarities (+/-) marked inside
the compartment.
The LCD display will briefly show all the icons and a beep will sound.
Æ
3. Slide the cover back into the compartment and press the top to close it.
Note:
Replace the batteries when the Low battery icon is displayed on the screen.
7.2 Powering via USB
1. Connect the provided USB cable to the USB-C
2. Connect the other end of the cable to a suitable USB power supply.
The LCD display will briefly show all the icons and a beep will sound.
Æ
The display will show the current indoor temperature and humidity readings
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The display will show the measured CO
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8 Placement
Place the product on a flat, dry, and stable surface. A hole is available on the back for wall hanging.
9 Turning the backlight on/off
If the product is powered by batteries, touch the On/Off button at the top to turn the backlight on. The
backlight will automatically turn off after 5 seconds.
If the product is powered by USB power, the backlight will always stay on. Touch the On/Off button at
the top to adjust the backlight brightness (High / Low / Off).
10 Setting the temperature unit
In the main screen, long press the ▲ / °C/°F button to switch the temperature unit to °C or °F.
Note:
– If the indoor temperature falls below the minimum or exceeds the maximum value in the measuring
range (-9.9 to 50 °C / 14.18 to 122 °F), the display will show "LL.L" or "HH.H" respectively.
– If the indoor relative humidity falls below the minimum or exceeds the maximum value in the
measuring range (1 % to 99 %), the display will show "1 %" or "99 %" respectively.
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10 11
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8 Adjust button
9 ▲ / °C/°F button
10 ▼ button
11 Alarm button
12 Battery compartment cover
13 USB-C
input
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input on the product.
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concentration after 94 seconds (initial display = 500 ppm).
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