TGS821

www.DataSheet4U.net FIGARO PRODUCT INFORMATION TGS 821 - Special Sensor for Hydrogen Gas Features: * High sensitivity and selectivity to hydrogen gas * Good repeatability in measurement and excellent stability * Uses simple electrical circuit * Ceramic base resistant to severe environment Applications: * Hydrogen gas detection for: - transformer maintenance - batteries - steel industry usage - etc. The sensing element of Figaro gas sensors is a tin dioxide (SnO2) semiconductor which has low conductivity in clean air. In the presence of a detectable gas, the sensor's conductivity increases depending on the gas concentration in the air. A simple electrical circuit can convert the change in conductivity to an output signal which corresponds to the gas concentration. The TGS 821 has high sensitivity and selectivity to hydrogen gas. The sensor can detect concentrations as low as 50ppm, making it ideal for a variety of industrial applications. The figure below represents typical sensitivity characteristics, all data having been gathered at standard test conditions (see reverse side of this sheet). The Y-axis is indicated as sensor resistance ratio (Rs/Ro) which is defined as follows: Rs = Sensor resistance of displayed gases at various concentrations Ro = Sensor resistance at 100ppm of hydrogen Sensitivity Characteristics: 100 Air Methane Ethanol 10 Carbon monoxide Rs/Ro 2 The figure below represents typical temperature and humidity dependency characteristics. Again, the Y-ax...