MNS-QT221 NDIR CO2 Gas Sensor
Product Description
Description
This CO2 gas sensor uses infrared absorption technology for carbon dioxide concentration measurement. It supports multiple measurement ranges and provides UART and analog voltage output for system integration. With temperature compensation, stable performance and fast response, it is suitable for CO2 detection and monitoring equipment.
Key Features
Excellent stability,resistance to water vapor interference
Non-poisoning,high sensitivity,high resolution
Low power consumption,and fast response time
Temperature compensation
Specifications
Target Gas |
Carbon Dioxide (CO2) |
Detection Principle |
Infrared Absorption |
Measurement Range |
0–2000 ppm / 0–5000 ppm / 0–1%vol / 0–2%vol / 0–5%vol / 0–100%vol |
Accuracy |
±5%FS |
Operating Voltage |
3.3–5 VDC |
Average Current |
<85 mA |
Interface Level |
DC 3.0 V |
Output Signal |
UART / 0.4–2 V |
Warm-up Time |
180 s |
Response Time |
T90 <30 s |
Temperature Compensation |
Yes |
Operating Temperature |
-20°C to +60°C |
Operating Humidity |
0–95% RH, Non-condensing |
Lifespan |
>5 Years |
Protection Level |
IP65 |
Weight |
25 g |
Intrinsic Safety Parameters |
Ui=7.5 VDC, Ii=265 mA, Pi=0.5 W, Ci=10 μF, Li=0 mH |
Pin Definition
Pin |
Description |
|---|---|
Pin 1 |
GND |
Pin 2 |
Vin Voltage Input |
Pin 3 |
UART RXD Data Input, 0-3.0V |
Pin 4 |
Vout, 0.4-2V |
Pin 5 |
UART TXD Data Output, 0-3.0V |
The dual-output design allows OEM manufacturers to integrate the sensor into embedded controllers, gas detectors and intelligent monitoring equipment.
Applications
CO2 gas detectors
Indoor air quality monitoring equipment
Environmental monitoring equipment
Industrial CO2 monitoring systems
OEM gas sensing equipment
FAQs
What type of CO2 sensor is the MNS-QT221?
The MNS-QT221 is an NDIR carbon dioxide sensor. It measures CO2 concentration using infrared absorption technology.
What CO2 measurement ranges are available?
Available measurement ranges include 0–2000 ppm, 0–5000 ppm, 0–1% vol, 0–2% vol, 0–5% vol, and 0–100% vol.
What output interfaces does the MNS-QT221 provide?
The sensor supports UART digital communication and a 0.4–2 V analog voltage output.
What is the operating voltage?
The MNS-QT221 operates from a 3.3–5 VDC power supply.
What is the response time?
The specified response time is T90 <30 seconds.
Does the MNS-QT221 include temperature compensation?
Yes. The sensor includes temperature compensation to improve measurement stability under changing environmental temperatures.
What is the operating temperature range?
The operating temperature range is -20°C to +60°C.
What is the protection level?
The MNS-QT221 has an IP65 protection level.
What is the expected service life?
The expected service life is more than five years under suitable operating conditions.
Is the MNS-QT221 suitable for OEM products?
Yes. Its compact design, multiple CO2 measurement ranges, UART interface, analog output, and long service life make it suitable for integration into OEM gas detection and monitoring equipment.