Sentinel C19 Air Monitor Handheld

A handheld CO2 monitor that alerts and monitors multiple spaces for air quality indicating high levels of exhaled water vapour and potential virus transfer risk.

Handheld & portable CO2 Monitor

Easy to read, use and report

Suitable for large or small spaces

Ideal for schools, hospitals and factories to establish safe levels

USB traceability

Product information

Lightweight & robust, the Sentinel C19 handheld can accurately and quickly measure CO2 with in an enclosed space repetitively, one unit can cover a large number of small spaces relatively quickly, ideal for schools, restaurants, offices or hospitals. Fitting easily in the palm of your hand, the Sentinel measures the level of CO2 in the air.

Air movement and quality is considered vital by the WHO to help significantly reduce the spread of Covid-19. CO2 monitoring is an easy way to monitor to the density of exhaled water vapour in the air, as it acts as a high quality proxy. As water vapour density rises, the risk of spread, even in socially distanced classrooms, workplaces or entertainment spaces rises. Through monitoring, the optimum flow of air can be achieved, allowing staff and guests to be safe as well as balance the need for warm or heated air with that of fresh air. The same need can also occur in chilled factory settings, where fresh air may need to be cooled on entry but quality clean air is vital to reduce spread.

With an accurate and easy to read display, monitoring is easy and simple and can be recorded. The unit contains an integrated pump and is powered by a rechargeable lithium ion battery. It is supplied in a carry case with the charger and USB stick for transfer of recorded data.

Especially well suited to buildings such as schools or hospitals with multiple smaller spaces, one person can cover considerable ground quickly and easily.

How can Carbon Dioxide (CO2) help measure potential virus transfer conditions.?

All EMCO Sentinel devices are measuring CO2 in the air at ppm levels. Carbon Dioxide or CO2 is naturally exhaled by people as they breathe and increased CO2 concentration is a useful proxy for exhaled water vapour. The greater the exhaled CO2 concentration, the great the exhaled water vapour concentration and this is where the transmission risk of SARS Covid 19, increases.

Water vapour traps the virus (when breathed out by others) and is suspended in the air, this is not an issue outside, but when the air is trapped inside and has nowhere to go (due to lack of air movement and or poor ventilation) the density of water vapour invisibly builds and increases the risk of cross spread infection. Water vapour can therefore be measured (indicatively) by the level of CO2 in the air and the risk factor assessed by our CO2 measurement equipment.

The German Environment Ministry* has published guidance that concentrations of CO2 over 1000ppm in schools, offices and enclosed spaces is a sign of increased risk of transmission and the need for through flow of fresh air.

EMCO Sentinel equipment can be set to alert at 1000ppm or even below if preferred, so that there is time for air flow to take effect. The device indicates the level of CO2 in the air constantly, so that varied air flow & ventilation solutions can be evaluated. A digital readout linked to an audible arm or visual arm then provide an objective and repeatable level to building and venue owners, who can then ensure sufficient ventilation to protect their employees and customers


German Environment Ministry


Harvard T H Chan School of Public Health

Peng & Jimenez University of Colorado

Download a data sheet for full product and technical specification

Use in enclosed buildings to monitor air quality

Use in enclosed transport systems to monitor air quality

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