Stable relative sensitivty between CH4 & LP gas Good durability For residential gas alarms - Figaro Engineering - #1

figaro

tgs 2612

* residential lng and lpg alarms

* portable combustible gas leak detectors

* detectors for lng and lpg

* low power consumption

* similar sensitivity at same %lel levels

for both methane and lp gas

* long life and low cost

* uses simple electrical circuit

The sensing element is comprised of a metal oxide semiconductor layer formed on an alumina substrate of a sensing chip together with an integrated heater. 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 2612 has high sensitivity to methane, propane and butane, making it ideal for LNG and LPG monitoring. Due to its low sensitivity to alcohol vapors (a typical interference gas in the residential environment), the sensor is ideal for consumer market gas alarms.

Due to miniaturization of the sensing chip, TGS 2612 requires a heater current of only 56mA and the device is housed in a standard TO-5 package.

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 ressstance ratoo (Rs/Ro) which is defined as follows:

Rs = Sensor resistance in displayed gases at various concentrations

Ro = Sensor resistance in 5000ppm of methane

The figure below represents typical temperature and humidity dependency characteristics. Again, the Y-axis is indicated as sensor ressstance ratoo (Rs/Ro), defined as follows:

Rs = Sensor resistance at 10%LEL of each gas

at various temperatures/65%RH Ro = Sensor resistance at 10%LEL of each gas at 20°C and 65% R.H.

sensitivity characteristics: 100

10

10

o

9; 1/5 Ol

o 01

1

0.1

0.1

-20 -10 0 10 20 30 ambient temperature (°c)

40

50

100

1000 10000

Gas concentration (ppm)

100000

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.