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    Picture of Carbon Monoxide Gas Sensor with MEMS, 5-5000ppm Picture of Carbon Monoxide Gas Sensor with MEMS, 5-5000ppm Picture of Carbon Monoxide Gas Sensor with MEMS, 5-5000ppm

    Carbon Monoxide Gas Sensor with MEMS, 5-5000ppm

    1 review(s) | Add your review
    SKU: SUCH-COS-702B
    $30.03
    ● Carbon monoxide gas sensor based on MEMS technology ● Detects 5-5000ppm CO in air monitoring systems ● Low-power design with fast response ● Adjustable output circuit for CO alarm devices
    This product has a minimum quantity of 2
    🚚 Free shipping
    🕒 Delivery date: 6-12 days
    🔁 30-day Returns
    Overview

    This MEMS carbon monoxide gas sensor is a compact CO sensing element for reliable carbon monoxide detection. It measures 5-5000ppm CO with low power consumption, high sensitivity, fast response, and stable long-term performance. It is suitable for residential CO gas alarms, industrial CO alarm systems, portable CO detectors, and embedded air quality monitoring devices.

    Feature

    CO gas sensor feature

    • This CO gas sensor employs MEMS technology, featuring a robust structure and high sensitivity to carbon monoxide, with a detection range of 5-5000 ppm.
    • The high-performance SUCH CO sensor offers advantages including compact size, low power consumption, high sensitivity, fast response and recovery, simple drive circuitry, excellent stability, and long service life.
    • MEMS CO sensors are primarily used in residential CO gas leak detectors, industrial CO gas alarms, and portable CO gas detectors.

    Dimension (unit: mm)

    CO gas sensor dimension

    Pin Definition

    CO gas sensor pin definitions

    Pin Connection Pin Connection
    ① RH1 ⑤ RS1
    ② / ⑥ /
    ③ RH2 ⑦ RS2
    ④ / ⑧ /


    Test Circuit Diagram

    CO gas sensor test circuit diagram

    Description: The figure above shows the basic test circuit for a MEMS carbon monoxide sensor. This sensor requires two applied voltages: Heater voltage (VH) and test voltage (VC). VH is used to provide the sensor with a specific operating temperature and can be supplied by either a DC or AC power source. Vout is the voltage across the series load resistor (RL) of the sensor. VC is the test voltage applied to the load resistor RL and must be supplied by a DC power source.

    Sensor Curve

    CO gas sensor response recovery curve

    Response Recovery Curve

    CO gas sensor linear characteristic curve

    Linear Characteristic Curve

    Specs
    Detected Gas Carbon Monoxide
    Detection Concentration 5-5000ppm CO
    Loop Voltage (Vc) ≤24V DC
    Heating Voltage (VH) 2.5V ±0.1VAC or DC ( high temp )
    0.5V ±0.1VAC or DC ( low temp )
    Heating Time (TL) 60s ±1s ( high temp )
    90s ±1s ( low temp )
    Load Resistance (RL) Adjustable
    Heating Resistance (RH) 80Ω ±20Ω ( room temp )
    Heating Power Consumption (PH) ≤50mW
    Sensor Element Resistance (Rs) 1kΩ to 30kΩ (at 150ppm CO)
    Sensitivity Ro (in air) / Rs (at 150ppm CO) ≥3
    Temperature 20°C ±2°C
    Humidity 55%RH ±5%RH
    Standard Test Circuit VH: 2.5V ±0.1V (high temperature)
    0.5V ±0.1V (low temperature)
    Vc: 5.0V ±0.1V
    Standard Package Ceramic package
    Application
    CO gas sensor of residential co gas alarm

    Residential CO Gas Alarm

    CO gas sensor of industrial co gas alarm

    Industrial CO Gas Alarm

    CO gas sensor of portable co gas detector

    Portable CO Gas Detector

    FAQ
    ❯

    The carbon monoxide gas sensor utilizes MEMS technology to fabricate a microheater on a silicon substrate. The gas-sensitive material employed is a metal oxide semiconductor with low electrical conductivity in clean air. When the target gas is present in the ambient air, the sensor's conductivity changes. Higher concentrations of carbon monoxide result in higher sensor conductivity. A simple circuit converts this conductivity change into an output signal proportional to the gas concentration.

    ❯

    The accuracy of CO sensors is influenced by factors such as variations in reference resistance between sensors, sensitivity differences, temperature, humidity, interfering gases, and aging time. Their input-output relationship exhibits nonlinearity, hysteresis, and non-repeatability in operational characteristics. Therefore, periodic calibration (single-point/multi-point calibration across the full range is possible) is essential for absolute concentration measurements to ensure accurate value transfer of the CO sensor. Relative measurements do not require calibration.

    ❯

    When MEMS gas sensors are stored for extended periods without power, their resistance undergoes reversible drift. Preheating is required before use to achieve internal chemical equilibrium. The warm-up voltage must match the heating voltage VH.

    1 review(s)
    5.0 1
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    Jason Miller | 6/11/2026 9:53 AM
    Solid carbon monoxide gas sensor for my custom esphome node
    Received a couple of these carbon monoxide gas sensor units to solder onto a custom home monitoring PCB. Really like the wide 5-5000ppm measurement range, covers everything from minor leaks to heavy smoke. Tweaking the load resistance took a bit of trial and error to get the analog baseline flat, but it's running fine now.
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