For low concentration CO detection
*CO : Carbon Monoxide
Features of the CMM5141
- Linear output for low concentration CO gas
- Input voltage range: 2.5～5.5VDC
- Temperature-compensation circuit
- Self-diagnosis function
- Factory pre-calibrated
- Compliant with ANSI/ASHRAE 62.1-2022, WELL, RESET, and LEED
Applications of the CMM5141
- Indoor Air Quality (IAQ) monitors
- Ventilation system control
- Low concentration CO monitoring
- Healthcare / Wellness devices
The dangers of low levels of CO
Carbon monoxide (CO) is a colorless and odorless toxic gas that is hard to detect and difficult to recognize for its potential danger.
CO gas readily binds to hemoglobin in the blood and prevents the transport of oxygen in the blood, causing symptoms of carbon monoxide poisoning, such as headaches, nausea, or dizziness. Severe CO poisoning may result in loss of consciousness, convulsions, coma, or in the worst case, fatality.
POINT
Exposure to CO for an extended period even in low levels of a few ppm could negatively impact your health as illustrated by the examples of carbon monoxide poisoning shown here.
Where does low-concentration CO come from?
It is said that car exhaust is the primary source of carbon monoxide (CO) outside. Typically, it ranges from a few ppm to 10 ppm.
In the event of incomplete combustion, gas- or oil-powered heating systems or other gas appliances may generate a higher concentration of CO indoors than in the outdoor air.
︎Building standards for low CO concentrations
According to the World Health Organization (WHO) guidelines for indoor air quality, prolonged exposure to low levels of carbon monoxide (CO) may have significant health effects. These health implications include physical symptoms, sensory–motor changes, cognitive memory deficits, emotional–psychiatric alterations, cardiac events and low birth weight. In line with the WHO's guidelines, various building and indoor environmental assessment standards are established in each country or region, such as ASHRAE, WELL, RESET, and LEED.
- Source
- WHO guidelines https://www.who.int/publications/i/item/9789289002134
To ensure compliance with these building standards in relation to CO, a monitoring device with a gas sensor capable of accurately measuring low concentrations of CO is required.
Figaro Engineering Inc. is currently developing the CMM5141 gas sensor module, which has high sensitivity to detect low concentrations of CO in indoor air.
CMM5141 is precisely pre-calibrated using CO gas before delivery and ready for use without calibration work at the customer. This CO module has a built-in temperature compensation circuit and self-diagnosis function, ensuring reliable and stable operation for a long period.
Specifications for CMM5141 (tentative)
The preliminary specifications of the CMM5141 module for low-concentration CO detection are shown in the following table.
| Model number | CMM5141 | |
|---|---|---|
| Gas sensor | TGS5141 (electrochemical) | |
| Detection range | 0 ~ 23ppm CO | |
| Current consumption | ≤ 5mA | |
| Input voltage | VIN | 2.5 ~ 5.5V DC |
| Output signal | VCONC. | 0 ~ 2.3V DC |
| Normal operation | Vconc. = CO conc.(ppm) /10 | |
| VCONC (in CO 10ppm) |
approx 1.0V | |
| Operating temperature | 0℃ ~ +50℃ | |
| Operating humidity | 10 ~ 95%RH (no condensation) | |
| Storage conditions | -10℃ ~ +50℃, 10 ~ 95%RH (no condensation) | |
| Dimensions | approx. 35 × 35 × 11 mm | |
Linear output suitable for low-concentration CO gas detection
This electrochemical sensor module is capable of detecting low concentrations of CO with a wide input voltage range from 2.5 to 5.5VDC.
This CO sensor module provides linear output with respect to CO concentrations, making it suitable for meeting building standards or other technical standards in each country or region.
Temperature compensation circuit and Self-diagnosis function
The CMM5141 is equipped with a compact, long-life, and reliable CO gas sensor (TGS5141).
It includes a temperature compensation circuit and self-diagnosis function and is factory pre-calibrated with CO gas, making it ready for immediate use.
For more information, please email us at 
Application examples where
low-concentration CO gas monitoring is desirable
A wide range of applications of the CMM5141 is anticipated for indoor air quality control and CO monitoring in various buildings and indoor areas.
(schools, libraries, etc.)
Wellness facilities
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About Figaro
The Japanese company Figaro Engineering Inc. was founded in 1969 and is now the leading gas sensor manufacturer, boasting the world's largest volume of gas sensor production. We offer our customers worldwide comprehensive technical and commercial support through our global distribution channels, which include our own sales offices in the United States and China, along with local distributors in Europe, Asia, and other regions. With their high level of automation, our advanced production lines ensure quick delivery of large volume requirements.
DistributorsFor more information, please email us at 