metriful MD-21 Carbon Dioxide Monitor User Manual
- June 2, 2024
- metriful
Table of Contents
metriful MD-21 Carbon Dioxide Monitor
Specifications:
- Product Name: Metriful MD-21
- Measurement: Carbon Dioxide (CO2) gas concentration in parts per million (PPM)
- Power Source: USB cable or internal rechargeable battery
- Battery Life: Up to 9 hours from fully charged
- Display: Bright light emitting display with a colored indicator light
- Alarm: Audible and visual alarm triggered by CO2 level rise above threshold
- Additional Features: 24-hour clock, date function, audible warning alarm
Product Usage Instructions
Powering the Monitor:
The monitor can be powered by the included micro USB cable or the internal
rechargeable battery. For long-term monitoring, it is recommended to keep the
monitor connected to USB power.
Placement:
Place the monitor in the area you want to monitor CO2 levels. For large
rooms, use one monitor for every 120 m² of floor area.
Checking Measurements:
Occasionally check the CO2 measurement or the colored indicator light on
the monitor to monitor CO2 levels. The audible and visual alarm will trigger
if the CO2 level rises above the set threshold.
Disabling Alarm Sound:
You can mute the alarm sound by pressing a single button on the monitor.
Calibration:
Perform manual calibration before first use as described in the user guide.
The monitor performs automatic self-calibration for ongoing accuracy.
FAQ:
-
Where can I use it?
The monitor is suitable for most indoor areas, including homes, offices, classrooms, clinics, cafes, and restaurants. -
Is it battery-powered?
The monitor can be powered by a USB cable or an internal rechargeable battery. USB power is recommended for long-term monitoring.
MD-21 Carbon Dioxide Monitor Frequently Asked Questions
How do I use it?
Place it in the area you wish to monitor and occasionally check the
measurement or the coloured indicator light:
- Green: CO2 level is low and air quality is good.
- Yellow: CO2 level is raised: avoid further increase by improving ventilation or reducing overcrowding.
- Red: CO2 level is high and air quality is bad. Ventilate the room urgently and consider leaving the area.
The red level also triggers the audible alarm.
Why do I need it?
Even moderate levels of CO2 can cause discomfort and adverse cognitive
effects, including headaches and impaired decision-making. These levels are
easily reached in modern, energy-efficient buildings because there is little
airflow from outside.Improved ventilation prevents CO2 build-up and improves
the general air quality. Increased ventilation is also known to reduce the
risk of airborne virus transmission.
Use the monitor to:
- Check ventilation effectiveness in your indoor areas.
- Get an early warning of worsening air quality so you can take preventive action.
- Save money by ventilating only when needed, avoiding increased heating bills.
Where can I use it?
The monitor is suitable for most indoor areas, including homes, offices, classrooms, clinics, cafes and restaurants. It is designed to be used long- term in a single location.
Is it battery powered?
The monitor can be powered by USB cable, or by the internal rechargeable battery. We recommend that it is kept on USB cable power as this allows long- term monitoring without the hassle of recharging. The battery is intended for short-term backup and relocation.
How long does the rechargeable battery last?
Up to 9 hours from fully charged, though this depends on the exact pattern of use (e.g. keeping the display light on uses more power). We recommend that the monitor is kept on USB cable power as this allows long-term use without the hassle of recharging.
What is supplied in the box?
CO2 monitor, detachable support stand, micro USB cable (1 metre long), instruction manuals (English, French, German, Dutch). Please note that a USB power source, such as a standard USB mains adapter, is required but not included.
Does it connect to a computer/phone/WiFi network?
No, the monitor is a standalone device and does not connect to other systems.
What does it measure?
Carbon Dioxide (CO2) gas concentration in parts per million (PPM) measurement units. It has an audible warning alarm, which triggers when the CO2 concentration rises above a configurable level. It also has a 24-hour clock and date function (day of month and month of year).
Does it have a bright display screen?
The monitor has a bright light emitting display. To avoid distraction, or for use in dark rooms, you can disable (darken) the screen with a single button press. In this state, the coloured indicator light flashes briefly every five seconds. The monitor continues to measure CO2 and will still alert you to high levels.
What room size is it suitable for?
It is suitable for all room sizes. In large rooms, use one monitor for every 120 m2 of floor area.
Does it have an alarm?
It has an audible and visual alarm which triggers when the CO2 level rises above the alarm threshold. You can disable the alarm sound by muting the monitor with a single button press.
Can I change the alarm threshold levels?
Yes. The user guide explains how to change the green-yellow threshold and the yellow-red threshold, which is also the audible alarm trigger. These can be set to any value in the range 0–5000 ppm in 50 ppm steps.
Does it need calibrating?
Follow the manual calibration procedure (described in the user guide) before the first use. This corrects for small changes that occur during shipment of the monitor to you. After that, the monitor ensures ongoing accuracy by performing automatic self-calibration.
Does it use an NDIR sensor?
Yes, the monitor uses a non-dispersive infrared sensor (NDIR). NDIRs are the best technology for compact and accurate consumer CO2 measurement.
Is it accurate?
Yes. The monitor has a measurement accuracy of ±50 ppm ±3% of reading. Indoor CO2 levels typically vary by 1000 ppm, so the monitor can easily distinguish healthy and unhealthy levels.
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>