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Hydrogen Gas Sensor - TGS821

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Features of Hydrogen Gas sensor TGS821:
Detection range ; 10-10000ppm
Circuit voitage : 5.0±0.2VDC/AC
Heater current : 180mA
High sensitivity to hydrogen gas
High sensitivity to gaseous air contaminants
Uses simple electrical circuit
Ceramic base resistant to severe environment

Model Number: TGS821

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Product Specification

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

Application examples

Hydrogen gas detection for:
-transformer maintenance
-batteries
-steel industry usage
-etc.

Specifications

Target gases	Hydrogen
Typical detection range	30-1,000ppm
Sensing principle	MOS type Precautions for use
Driving voltages	Heater Voltage：5.0V Circuit Voltage：Max24V
Power consumption	660mW (typical)
Dimensions	φ19.5×16.5mm
Weight	Approx. 7.7g

The sensing element of Figaro gas sensors is a tin dioxide (SnO2) semiconductorwhich 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. Asimple 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 candetect concentrations as low as 50ppm, making it ideal for a variety of industrial applications.

Standard Test Conditions:
TGS 821 complies with the above electrical characteristics when the sensor is tested in standard conditions as specified
below:
Test Gas Conditions: 20°±2°C, 65±5%R.H.
Circuit Conditions: VC = 10.0±0.1V (AC or DC),
VH = 5.0±0.05V (AC or DC),
RL = 4.0kΩ±1%
Preheating period before testing: More than 7 daysStandard Test Conditions:
TGS 821 complies with the above electrical characteristics when the sensor is tested in standard conditions as specified