Carbon Monoxide

Electrochemical Sensor
Solid-state electrochemical sensor is now available in WOOFAA Cee, a wireless indoor air quality monitor, as a sensor option. This page illustrates the data measuring excellence with this advanced high polymer technology from Germany.
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Incomplete Combustion

Incomplete combustion occurs when the supply of air or oxygen is poor. Carbon monoxide (CO) is produced as a poisonous gas.

As CO levels increase and remain above 70 ppm, symptoms become more noticeable and can include headache, fatigue and nausea. At sustained CO concentrations above 150 to 200 ppm, disorientation, unconsciousness, and death are possible.

This Smoke-100 electrochemical sensor measures CO level below 100 ppm, good enough to alert people a build-up of this poisonous gas.

Solid-state Electro-chemical Gas Sensor

Sensor Competence Overview

Apart from a compact size, long product life and low cost versus conventional liquid-state electrochemical sensor, our solid-state sensor also has these advantages:

  • Industrial grade precision (accuracy, repeatability & linearity), superior performance above all semiconductive and MEMS type sensors
  • PPB (parts-per-billion) resolution, against to PPM (parts-per-million) on semiconductive and MEMS type sensors
  • Less data drifting over time, no calibration is ever needed over its product life
  • Faster response time, quicker zero recovery, no warm-up time due to its low temperature resistance
  • Immunes towards electromagnetic interference, resulting a lower-cost hardware construction to work with AC power supply and WIFI signals on the same PC board
  • Works well in very dry ambient, as the high polymer file is insensitive to humidity changes
  • Works well in vacuum or anoxic ambient
  • Compact size
  • One-third or one-fourth of price to conventional liquid-state electrochemical type sensors
  • Compliance:
    • RoHS
    • EMC: EN55022 and FCC
    • EU 2002/231/CE Directive
    • EN 13779:2007
    • GB 12358:2006
    • GB 50325:2010
    • GB 3095:1996
    • GB/T 18883:2002
    • TW Indoor Air Quality Standards
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Measures of Smells

Professional Applications

Model WF2CW-K1000, is a simple application for garage and plant room with combustion activity nature. Three parameters are quantified:
  1. Carbon Monoxide upto 100 ppm
  2. Indoor Air temperature
  3. Indoor Relative humidity

Industrial Applications

Model WF2CW-5A000, WF2CW-5C000, and WF2CW-5D000 measure in industrial occasions. This model measures 3 air quality parameters as:
  1. Carbon Monoxide
  2. Indoor Air temperature
  3. Indoor Relative humidity
Electrochemical Gas Sensor: Carbon Monoxide from Incomplete Combustion

Linearity Test

Typical test result: within ± 5% deviation on all checkpoints (20 ppm, 40 ppm, 60 ppm, 80 ppm). Within ± 3% in 0~50 ppm region.

Electrochemical Gas Sensor: Carbon Monoxide from Incomplete Combustion

Gaseous Interference Tests

13 types of span gases are used as a standard method and procedure to quantify interference of our Smoke-100 electrochemical sensor:

Carbon Monoxide (CO), Nitrogen Dioxide (NO2), Formaldehyde (HCHO), Hydrogen (H2), Ethanol (C2H6O), Acetaldehyde (C2H4O), Benzene (C6H6), Ammonia (NH3), Ozone (O3), Methane (CH4), (C2H2), Acetylene (C4H8), Dichloromethane (CH2Cl2)

Electrochemical Gas Sensor: Carbon Monoxide from Incomplete Combustion

Zero-point Stability Test

Conventional semi-conductive and liquid-state electrochemical type sensors are often subjected to data drift even in non-contaminated environment, yielding shift of baseline and inaccurate measures.

Our electrochemical sensors are tested in a constant blow of fresh air for 12 hours, showing a baseline shift < 300 ppb, while the conventional sensors types often go above 1,000 ppb.

Electrochemical Gas Sensor: Carbon Monoxide from Incomplete Combustion

Conformance Test

How a group of sensors measure on a fixed concentration of span gas? This test is to find the answer and to screen out the incompetent.

While any other semiconductive and MEMS types gas sensor fail (deviation greater than 5%), our Smoke-100 sensor all fall within 5 ppm in a full-scale measure of 100 ppm, which is less than 5%.

Electrochemical Gas Sensor: Carbon Monoxide from Incomplete Combustion

Stability Test

How a group of sensors measure over a discontinuous change of concentration? This test is to find the answer and to screen out the incompetent.

While any other semiconductive and MEMS types gas sensor fail (deviation greater than 5%), our Smoke sensor all fall within 5 ppm in a full-scale measure of 100 ppm.

Electrochemical Gas Sensor: Carbon Monoxide from Incomplete Combustion

Carbon Monoxide Sensor Specifications

Four measuring range options are available for smell monitoring:

Code  | Range | Resolution
  • X_K1 | 1~100 ppm | 0.1 ppm
  • X_5A | 0.1~10 ppm | 0.01 ppm
  • X_5C | 5~500 ppm | 0.1 ppm
  • X_5D | 5~1000+ ppm | 0.1 ppm

Standard Factory Test

Proprietary electrochemical sensor calibration and baseline adjustment method, appliance and software tools

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