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FIGARO
PRODUCT INFORMATION
TGS 2611 - for the detection of Methane
Features:
* Low power consumption * High sensitivity to methane * Long life and low cost * Uses simple electrical circuit
Applications:
* Domestic gas alarms * Portable gas detectors * Gas leak detector for gas appliances
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 2611 has high sensitivity and selectivity to methane gas. Due to its low sensitivity to alcohol vapors (a typical interference gas in the domestic environment), the sensor is ideal for domestic gas alarms. Due to miniaturization of the sensing chip, TGS 2611 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 resistance ratio (Rs/Ro) which is defined as follows: Rs = Sensor resistance in displayed gases at various concentrations Ro = Sensor resistance in 5000ppm of methane Sensitivity Characteristics:
100
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 in 5000ppm of methane at various temperatures/humidities Ro = Sensor resistance in 5000ppm of methane at 20C and 65% R.H. Temperature/Humidity Dependency:
10
35%RH 50%RH 65%RH 95%RH
10 Rs/Ro
Air
Rs/Ro
1
1
Ethanol Hydrogen Iso-butane Methane
Gas: 5000ppm methane
0.1 100 1000 10000 100000
0.1 -20 -10 0 10 20 30 40 50 Ambient temperature (C)
Gas concentration (ppm)
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.
Basic Measuring Circuit:
The sensor requires two voltage inputs: heater voltage (VH) and circuit voltage (VC). The heater voltage (VH) is applied to the integrated heater in order to maintain the sensing element at a specific temperature which is optimal for sensing. Circuit voltage (VC) is applied to allow measurement of voltage (VRL) across a load resistor (RL) which is connected in series with the sensor. A common power supply circuit can be used for both VC and VH to fulfill the sensor's electrical requirements. The value of the load resistor (RL) should be chosen to optimize the alarm threshold value, keeping power dissipation (PS) of the semiconductor below a limit of 15mW. Power dissipation (PS) will be highest when the value of Rs is equal to RL on exposure to gas.
Specifications:
Model number Sensing element type Standard package Target gases Typical detection range Heater Voltage Standard circuit conditions Circuit voltage Load resistance Heater resistance Heater current Electrical characteristics under standard test conditions Heater power consumption Sensor resistance Sensitivity (change ratio of Rs) Test gas conditions Standard test conditions Circuit conditions Conditioning period before test VH VC RL RH IH PH Rs TGS 2611 D1 TO-5 metal can Methane, Natural Gas 500 ~ 10,000 ppm 5.00.2V DC/AC 5.00.2V DC Variable Ps 15mW Ps 15mW
Structure and Dimensions:
Top view
Side view
59 at room temp. (typical) 56 5mA 28025mW 0.68~6.8 k in 5000ppm methane 0.60 0.06 Rs (9000ppm) Rs (3000ppm)
Bottom view
Methane in air at 202C, 655%RH VC = 5.00.01V DC VH = 5.00.05V DC 7 days
The value of power dissipation (PS) can be calculated by utilizing the following formula: PS = (VC - VRL)2 RS
Sensor resistance (Rs) is calculated with a measured value of VRL by using the following formula: RS = VC - VRL VRL x RL
For information on warranty, please refer to Standard Terms and Conditions of Sale of Figaro USA Inc.
FIGARO USA, INC. 3703 West Lake Ave. Suite 203 Glenview, Illinois 60025 Phone: (847)-832-1701 Fax: (847)-832-1705 email: figarousa@figarosensor.com
REV: 9/99

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