Smell (Organic & Inorganic)

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

Standard Factory Test

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

WOOFAA Cee Offers Configurable Sensor Options as per Your Project Needs

Measures of Smells

Professional Applications

Model WF2CW-M1000, measure smell in commercial occasions like public toilets, schools and public halls. Three parameters are quantified:
  1. Smell upto 5 ppm
  2. Indoor Air temperature
  3. Indoor Relative humidity

Industrial Applications

Model WF2CW-M3000, measures in industrial occasions involving smell emission like food storage, grease trap and sewage areas. . This model measures 3 air quality parameters as:
  1. Smell upto 500 ppm
  2. Indoor Air temperature
  3. Indoor Relative humidity
Solid-state Electrochemical Gas Sensor: Smell (Organic & Inorganic)

Linearity Test

Typical test result: within ± 5% deviation on all checkpoints (0.5ppm, 1ppm, 3ppm, 5ppm). Within ± 3% in 0~5ppm region.

Solid-state Electrochemical Gas Sensor: Smell (Organic & Inorganic)

Gaseous Interference Tests

12 types of span gases are used as a standard method and procedure to quantify interference of our Smell sensor:

Ammonia (NH3), Hydrogen Sulfide (H2S), Isopropylamine (C3H9N), Dimethylamine (C2H7N), Methanethiol (CH3SH), Dimethyl Sulfide (C2H6S), Dimethyl Disulfide (C2H6S2), Styrene (C8H8), Carbon Disulfide (CS2), Ozone (O3), Sulfur Dioxide (SO2), Nitrogen Oxides (NOx)

Solid-state Electrochemical Gas Sensor: Smell (Organic & Inorganic)

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 solid-state sensors are tested in a constant blow of fresh air for 12 hours, showing a baseline shift < 10 ppb, while the conventional sensors types often go above 20 ppb.

Solid-state Electrochemical Gas Sensor: Smell (Organic & Inorganic)

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 Smell sensor all fall within 20 ppb in a full-scale measure of 5,000 ppb, which is less than 0.4%.

Solid-state Electrochemical Gas Sensor: Smell (Organic & Inorganic)

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 1%), our Smell sensor all fall within 20 ppb in a full-scale measure of 5,0000 ppb, which is 0.4%.

Solid-state Electrochemical Gas Sensor: Smell (Organic & Inorganic)

Smell Sensor Specifications

Two measuring range options are available for smell monitoring:

Code  | Range | Resolution
  • X_M1 | 0.05~5 ppm | 1 ppb
  • X_M3 | 5~500 ppm | 100 ppb