Categories: ELRO

ELRO PK4910 Carbon Monoxide Alarm Instruction Manual

ELRO PK4910 Carbon Monoxide Alarm 
Instruction Manual


Congratulations on the purchase of the ELRO Pro PK4910 carbon monoxide detector! A carbon monoxide detector sounds an alarm at elevated carbon monoxide (CO) levels and warns you of potentially life-threatening situations. Carbon monoxide is an invisible, odourless and tasteless gas and cannot be detected naturally. A carbon monoxide detector is therefore indispensable in every home in which combustion appliances are present.

Contents of the package

  • Carbon monoxide detector
  • Mounting bracket
  • Assembly parts (2 screws and 2 plugs)
  • User manual

Product description

  • a. Siren
  • b. LCD display
  • c. Test/mute button
  • d. Standby indicator (green)
  • e. Alarm indicator (red)
  • f. Error indicator (yellow)
  • g. On/off switch

About carbon monoxide (CO)

What is carbon monoxide?
Carbon monoxide (CO) is an invisible, odourless and tasteless gas and cannot be detected naturally. It is a combustion by-product produced by the combustion of carbonaceous fuels such as natural gas, petroleum, coal and wood. If incomplete combustion occurs, the amount of carbon monoxide can quickly rise to a dangerous level. There may be various combustion appliances in and around houses that can possibly lead to increased CO concentrations, such as:

  • Heating equipment: central heating boiler, (open) fireplace, (gas) heater.
  • Water heaters: geyser, boiler, combi boiler (combines heating and hot water).
  • Cooking appliances: stove/gas stove, gas oven, barbecue.
  • Other devices: generator, motor vehicle, power tools.

Health effects of carbon monoxide
Adverse health effects arise because CO binds to haemoglobin (Hb) in the blood and takes the place of oxygen, as blood is transported through the vessels. This allows less oxygen to reach the organs and muscles in the body. As a result, various health problems can arise:

  • Exposure to 100-200 ppm: Mild headache, nausea, vomiting, fatigue (often described as ‘flu-like’ symptoms).
  • Exposure to 200-400 ppm: Severe headache, confusion, dizziness, accelerated heart rate.
  • Exposure to >400 ppm: Unconsciousness, coma, heart/lung failure, death.

What to do if carbon monoxide is detected?
If the carbon monoxide alarm sounds an alarm and has detected carbon monoxide, proceed as follows:

  • Keep calm, open all doors and windows and turn off all combustion appliances.
  • If the detector continues to sound the alarm, evacuate the building. Leave all doors and windows open and do not enter until the alarm has stopped.
  • Call the emergency number 112 and follow the instructions of the emergency responders. Seek medical attention for anyone who may be suffering from the effects of carbon monoxide poisoning.
  • Contact an c utility company. Do not use any combustion appliances until they have been checked by a qualified person.

Activation and testing

Before using the carbon monoxide alarm, it is important to activate and test it. Place the carbon monoxide alarm on the mounting plate (check lines in position h) and turn it clockwise UNTIL YOU FEEL A CLICK (to position i)! The device will now activate and count down from 60 to 0. After approximately 60 seconds, the carbon monoxide alarm has fully booted up. Next, check if the device is functioning properly by pressing and holding the test/mute button for approximately 3 seconds. If the device is working properly, it will beep four times and flash red. If this is not the case, do not use the device and contact the supplier.

NOTE: The test tone volume is lower than the alarm tone volume. If you want to hear the volume of the alarm signal, press and hold the test button for about 10 seconds. A few seconds after the test signal you will hear the alarm signal of > 85 dB (A).

Determining the location

In which room do you place a carbon monoxide detector?

  • For optimal protection, place a carbon monoxide detector in the following areas:
    – In every room where a combustion appliance is present.
    – In every bedroom.
    – In every room where a lot of time is spent and where the alarm from other carbon monoxide alarms may not be audible.
  • For minimal protection, place a carbon monoxide detector in the following areas:
    – In every room where a combustion appliance is present.
    – In the room where you spend most of your time.

Where do you install a carbon monoxide detector?

  • In rooms containing a combustion appliance, you can install the carbon monoxide detector in the following location:
    – At a horizontal distance of 1-3 meters from the combustion appliance.
    – If the space is divided by a wall or, for example, a large cupboard: on the same side as the combustion appliance
    – Preferably on the ceiling:
    o At a minimal distance of 30 cm from the wall.
    o In the centre of the room.
    – If ceiling mounting is not possible, the device can be mounted on the wall:
    o Approximately 15-30 centimetres from the ceiling
    o Above the top of windows/doors near the combustion appliance.
  • In rooms without a combustion appliance, install the carbon monoxide detector on the wall at breathing height. The breathing height depends on the type of room: in a bedroom, you consider the breathing height from a sleeping position; in an office, you consider the breathing height in a sitting position; and in a corridor, you consider the breathing height in a walking position.

NOTE: Never place a carbon monoxide detector in the following locations:

  • Behind objects that block the airflow, such as cupboards and curtains.
  • In locations where the LCD screen and LED indicators are not visible.
  • Near air in- and outlets such as windows and doors.
  • Directly above a sink or washbasin.
  • Next to an extractor hood, ventilation grid or air conditioning.
  • Areas where the temperature falls below – 10 °C or rises above 52 °C.
  • In areas where dust or dirt can block the sensor.
  • In damp areas.


  1. Take the mounting bracket and mark the positions of the drill holes.
  2. Drill 2 holes with a diameter of 5 millimetres.
  3. Push the plugs into the holes.
  4. Hang the mounting bracket in the correct location and secure it with the screws.
  5. Screw the carbon monoxide detector onto the mounting bracket. The carbon monoxide detector will switch on automatically.
  6. Test if the device works properly by pressing and holding the test/mute button for approximately 3 seconds. If the device is working properly, it will beep four times and flash red.

More tips on how to install your carbon monoxide detector? Go to See back page (cover) for drilling template for vertical installation!


In the standby mode, the CO level (if this is lower than 20 ppm it will display 0) and the room temperature are shown, in an alternating manner. If the CO level exceeds 20 ppm, only the CO level is displayed. This detector is equipped with a night mode, which means that the standby LED is automatically switched off in dark areas.


If the CO level in the room is too high, the carbon monoxide detector switches to the alarm mode according to the scheme below.

  • 030 ­ 049 PPM: Alarm signal after 120 minutes
  • 050 ­ 099 PPM: Alarm signal after 60 – 90 minutes
  • 100 ­ 299 PPM: Alarm signal after 10 – 40 minutes
  • > 300 PPM: Alarm signal within 3 minutes

Refer to the “What to do when carbon monoxide is detected?” chapter to learn what to do if the carbon monoxide detector triggers an alarm. If the CO level drops below 20 ppm, the carbon monoxide alarm will switch to the alarm memory mode for 48 hours. This will notify you of the increased CO concentration, even if you were not onsite at the time of the alarm.

Mute alarm
This carbon monoxide detector is equipped with a mute function with which the alarm signal can be temporarily switched off (approximately ten minutes). When the detector is triggered, press the test button to activate this function. If the CO level exceeds 50 ppm after 10 minutes, the detector switches back to alarm mode. The alarm mute function cannot be used if the detected CO level is higher than 200 ppm.
NOTE: Do not take any risks and only use the alarm mute function if you are 100% sure that the situation is safe. When in doubt, leave the premises and follow the instructions in the chapter “What to do when carbon monoxide is detected?”. Only use the mute function if you are in the same room as the carbon monoxide detector!

Low battery voltage
This carbon monoxide detector is equipped with a non-replaceable battery which has a lifespan of approx. 10 years. When the batteries are low, the detector switches to low battery mode. This means that the detector must be replaced as soon as possible. The low battery warning can be silenced for approx. 10 hours by pressing the test button.

End of life
This carbon monoxide detector has an end-of-life warning. Approximately 10 years after activation, the device needs to be replaced and switches to this mode. Replace the device as soon as possible after this message occurs.


  • The carbon monoxide detector is equipped with a self-testing mechanism. Once a month, the detector automatically checks the functionality of the sensor and the siren. If problems are found, the detector switches to the error mode (either siren error or sensor error). We recommend to manually test the detector at least once a year by pressing and holding the test button.
  • Dust is a major cause of false alarms. Therefore, clean the carbon monoxide detector once a month. Use a vacuum cleaner to gently remove any accumulated dust along the sides of the carbon monoxide detector. Never use a wet cloth or detergent to clean your alarm, as this can be harmful to the sensor.

Frequently asked questions (FAQ)

Do you have questions about installing or using this product? Then visit and go to the page of this product. Here you will find the most recent version of the manual, answers to frequently asked questions (FAQ) and detailed installation videos.


Recommended use

  • Warning: This device must be installed by a qualified person.
  • Warning: The installation of a carbon monoxide detector should not be a substitute for proper installation, use and maintenance of combustion appliances and suitable ventilation and exhaust systems.
  • Warning: Risk of electric shock or malfunction if the carbon monoxide detector has been tampered with.
  • Warning: Keep electronic equipment and packaging materials out of the reach of children and pets.
  • Do not expose the product and batteries to extreme temperatures.
  • This product is not water resistant and is only suitable for indoor use. Only clean the product with a dry cloth.
  • The following substances can affect the sensor and cause false alarms: methane, propane, isobutylene, isopropanol, ethylene, benzene, toluene, ethyl acetate, hydrogen sulphide, sulphur dioxide, alcohol-based products, paints, thinners, solvents, adhesives, hair sprays, aftershaves, perfumes and some cleaning agents.
  • EN 50291-1 – The apparatus may not prevent the chronic effects of carbon monoxide exposure. The apparatus will not fully safeguard individuals at special risk.

The WEEE symbol indicates that this product and its batteries should be disposed of, separately from household waste. When this product reaches the end of its life, take it to a designated waste collection point in your area to ensure safe disposal or recycling. Protect the environment and human health and use natural resources responsibly!

By attaching the CE marking to a product, a manufacturer declares that the product meets all legal requirements for CE marking and can be sold throughout the EEA.

Technical specifications

Service and contact

Would you like to contact us? That is possible! To ensure that we can serve our customers as well and quickly as possible, we kindly ask you to take the following into account:

For questions about the installation, use or operation of this product:

  • Go to to quickly get an answer to your question. Here you will find answers to frequently asked questions, detailed installation videos and the most recent version of the manual for your product.
  • Cannot find a solution on the website? Then leave a question via the product page or mail to We will help you as soon as possible.

For all other questions:

  • Mail to We will get back to you as soon as possible.

This product is manufactured by: ELRO Europe Postbus 9607 – Box E800 1006 GC Amsterdam The Netherlands

Documents / Resources

ELRO PK4910 Carbon Monoxide Alarm [pdf] Instruction Manual
PK4910, Carbon Monoxide Alarm, PK4910 Carbon Monoxide Alarm, Monoxide Alarm

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