FIGARO

PRODUCT INFORMATION

Applications:

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

* Hydrogen gas detection for:

- transformer maintenance

- batteries

- steel industry usage

- etc.

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 char-

acteristics, 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

The figure below represents typical temperature and

humidity dependency characteristics. Again, the Y-axis is

indicated as sensor resistance ratio (Rs/Ro), defined as

follows:

Rs = Sensor resistance at 100ppm of hydrogen

at various temperatures/humidities

Ro = Sensor resistance at 100ppm of hydrogen

at 20

°C and 65% R.H.

Temperature/Humidity Dependency:

Sensitivity Characteristics:

0.01

0.1

1

10

100

10

100

1000

10000

Concentration (ppm)

Air

Methane

Ethanol

Carbon monoxide

Hydrogen

0.5

0.6

0.7

0.8

0.9

1

2

-20

-10

0

1020304050

Ambient Temperature (°C)

3

R.H.

35%

65%

95%

IMPORTANT NOTE: OPERATING CONDITIONS IN WHICH FIGARO SENSORS ARE USED WILL VARY WITH EACH CUSTOMER’S SPECIFIC APPLICATIONS. FIGARO STRONGLY

RECOMMENDS CONSULTING OUR TECHNICAL STAFF BEFORE DEPLOYING FIGARO SENSORS IN YOUR APPLICATION AND, IN PARTICULAR, WHEN CUSTOMER’S TARGET GASES

ARE NOT LISTED HEREIN. FIGARO CANNOT ASSUME ANY RESPONSIBILITY FOR ANY USE OF ITS SENSORS IN A PRODUCT OR APPLICATION FOR WHICH SENSOR HAS NOT BEEN

SPECIFICALLY TESTED BY FIGARO.