{"id":236999,"date":"2020-12-27T14:15:11","date_gmt":"2020-12-27T13:15:11","guid":{"rendered":"https:\/\/emariete.com\/?p=236999"},"modified":"2023-11-25T10:22:22","modified_gmt":"2023-11-25T09:22:22","slug":"sensor-co2-mh-z19b","status":"publish","type":"post","link":"https:\/\/emariete.com\/en\/sensor-co2-mh-z19b\/","title":{"rendered":"The CO2 sensor bible MH-Z19B"},"content":{"rendered":"

<\/p>\n\n\n\n

The MH-Z19B NDIR CO2 sensor is fantastic. A cheap, accurate NDIR CO2 sensor <\/strong>(for the price it has) and very easy to use. Undoubtedly, one of the most used sensors with Arduino, ESP8266, EPS32 and similar.<\/p>\n\n\n\n

Discover all the secrets of the CO2 sensor MH-Z19B<\/strong> in one place. A cheap, accurate CO2 sensor <\/strong>(for the price) and very easy to use. <\/p>\n\n\n\n

Also CO2 sensor MH-Z19C<\/strong> (although a bit special) is a good sensor, as long as you know what you need to know about it and what makes it special.<\/p>\n\n\n\n

It even has a low-energy version, the NDIR CO2 sensor Winsen MH-Z1311A<\/a>.<\/p>\n\n\n\n

In this article you will find everything you want to know about these sensors (and if you can't find it, ask in the comments). <\/p>\n\n\n\n

Maybe calling it a bible, at the moment, is a bit pretentious, but I give you my word that it will become one. Give it time...<\/p>\n\n\n\n

This article is alive <\/strong>and it never stops growing. Subscribe to the Newsletter <\/strong>and don't miss anything.<\/p>\n\n\n\n

<\/p>\n\n\n\n

General data CO2 sensor MH-Z19B and MH-Z19C and MH-Z19D<\/h2>\n\n\n\n

CO\u2082 sensor MH-Z19B<\/h3>\n\n\n\n

The carbon dioxide gas sensor MH-Z19B is an intelligent, small, general-purpose sensor, which uses the principle of non-dispersive infrared (NDIR)<\/strong> to detect the presence of CO\u2082 in the air. <\/p>\n\n\n\n

It has good selectivity, long lifetime and other features, such as integrated temperature compensation. <\/p>\n\n\n\n

It has simultaneous serial, analogue and PWM output and is easy to use. <\/p>\n\n\n\n

It is a high performance sensor that combines reliable infrared absorption gas detection technology with good design and an attractive price.<\/p>\n\n\n\n

MH-Z19B sensor parameters<\/h4>\n\n\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
Model<\/th>MH-Z19B<\/th>\n<\/tr>\n<\/thead>\n
Gas detected<\/td>Carbon dioxide<\/td>\n<\/tr>\n
Operating voltage<\/td>4.5 ~ 5.5 V DC<\/td>\n<\/tr>\n
Medium current<\/td>< 60m A (@ 5V supply)<\/td>\n<\/tr>\n
Maximum current<\/td>150 mA (supply @ 5V)<\/td>\n<\/tr>\n
Interface level<\/td>3.3 V (5V compatible)<\/td>\n<\/tr>\n
Measuring range<\/td>0\uff5e2000 ppm
\n0\uff5e5000 ppm<\/td>\n<\/tr>\n
Output signal<\/td>Serial (UART) - TTL level 3.3 V - Analogue output PWM<\/td>\n<\/tr>\n
Preheating time<\/td>3 minutes<\/td>\n<\/tr>\n
Response time<\/td>T90<120s<\/td>\n<\/tr>\n
Operating temperature<\/td>0 ~ 50 \u00b0C<\/td>\n<\/tr>\n
Operating humidity<\/td>0 to 90% RH (non-condensing)<\/td>\n<\/tr>\n
Dimensions<\/td>33 mm\u00d720 mm\u00d79 mm (Length*Width*Height)<\/td>\n<\/tr>\n
Weight<\/td>5 grams<\/td>\n<\/tr>\n
Life<\/td>> 5 years<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n

Features of the MH-Z19B<\/h4>\n\n\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t
Gold-plated gas chamber<\/th> water and corrosion resistant<\/th>\n<\/tr>\n<\/thead>\n
High sensitivity<\/td> low energy consumption<\/td>\n<\/tr>\n
Excellent stability<\/td><\/td>\n<\/tr>\n
Temperature compensation<\/td> excellent linear output<\/td>\n<\/tr>\n
Long life<\/td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n

MH-Z19B sensor applications<\/h4>\n\n\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t
HVAC<\/th>from<\/th>equipment<\/th>from<\/th>cooling<\/th><\/td><\/td><\/td>\n<\/tr>\n<\/thead>\n
Equipment<\/td>from<\/td>surveillance<\/td>y<\/td>from<\/td>quality<\/td>from<\/td>air<\/td>\n<\/tr>\n
Systems<\/td>from<\/td>air<\/td>fresh<\/td><\/td><\/td><\/td><\/td>\n<\/tr>\n
Equipment<\/td>from<\/td>purification<\/td>from<\/td>air<\/td><\/td><\/td><\/td>\n<\/tr>\n
Home<\/td>Smart<\/td><\/td><\/td><\/td><\/td><\/td><\/td>\n<\/tr>\n
Schools<\/td>y<\/td>centres<\/td>educational<\/td><\/td><\/td><\/td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n

The CO2 sensor MH-Z19C<\/h3>\n\n\n\n

The MH-Z19 sensorC<\/strong> is very similar to the MH-Z19B<\/strong> although it has a few things that make it a bit special...<\/p>\n\n\n\n

Its accuracy, on paper, is a little worse than that of the MH-Z19B (50 ppm + 5% of measurement the MH-Z19B vs 50 ppm + 5% the MH-Z19C.<\/p>\n\n\n\n

In practice, and according to my experiments and observations, MH-Z19C is a rather more volatile sensor. Not that it is worse than MH-Z19B, but I like it less.<\/p>\n\n\n

\n
\"\"
Winsen MH-Z19C<\/figcaption><\/figure>\n<\/div>\n\n\n

The CO2 sensor MH-Z19D<\/h3>\n\n\n\n

The MH-Z19 sensorD<\/strong> is virtually the same as the MH-Z19C<\/strong>. It is very new (June 2021) so there is not much information about it yet.<\/p>\n\n\n\n

This sensor is so new on the market that it does not even appear on the manufacturer's website in English, you have to look for it in the Chinese version to find some information (not too much).<\/p>\n\n\n\n

\"\"
Winsen MH-Z19D<\/figcaption><\/figure>\n\n\n\n

I haven't found the official datasheet in English yet, here you can find the official one. Datasheet of the MH-Z19D dated 11-10-2021<\/a>.<\/p>\n\n\n\n

CO2 sensor MH-Z1311A<\/h3>\n\n\n\n
\n
\n

Although I am not including it here, because it is not strictly speaking an MH-Z19x, I could not fail to mention the energy-saving sensor MH-Z1311A<\/strong> of Winsen. <\/p>\n\n\n\n

First cousin 99% compatible <\/strong>with the MH-Z19 with a 99% energy saving<\/strong>.<\/p>\n\n\n\n

A very new sensor to consider. We will have to wait for the tests.<\/p>\n<\/div>\n\n\n\n

\n
\"\"<\/a>
Winsen CO2 Sensor MH-Z1311A<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

If you want to get to know him better, visit the following blog post<\/strong>:<\/p>\n\n\n

\n\n
\n
Winsen Low Power NDIR CO2 Sensor MH-Z1311A<\/a><\/blockquote>