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TGS2611 Datasheet Preview

TGS2611 Datasheet

The detection of Methane

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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
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 20°C and 65% R.H.
Sensitivity Characteristics:
Temperature/Humidity Dependency:
100 10
10 Air
35%RH
50%RH
65%RH
95%RH
1
Ethanol
Hydrogen
1 Iso-butane
Methane
Gas: 5000ppm methane
0.1
100
1000
10000
Gas concentration (ppm)
0.1
100000
-20 -10
0
10 20 30 40 50
Ambient temperature (˚C)
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.




Figaro

TGS2611 Datasheet Preview

TGS2611 Datasheet

The detection of Methane

No Preview Available !

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
Standard circuit
conditions
Heater Voltage
Circuit voltage
Load resistance
TGS 2611
D1
TO-5 metal can
Methane, Natural Gas
500 ~ 10,000 ppm
VH 5.0±0.2V DC/AC
VC 5.0±0.2V DC Ps 15mW
RL Variable
Ps 15mW
Structure and Dimensions:
Top view
Side view
Heater resistance RH 59at room temp. (typical)
Electrical
characteristics
under standard test
conditions
Heater current
Heater power
consumption
IH
PH
Sensor resistance Rs
Sensitivity
(change ratio of Rs)
Test gas conditions
Standard test
conditions
Circuit conditions
Conditioning period
before test
56 ± 5mA
280±25mW
0.68~6.8 kin 5000ppm
methane
0.60 ± 0.06
Rs (9000ppm)
Rs (3000ppm)
Methane in air
at 20±2˚C, 65±5%RH
VC = 5.0±0.01V DC
VH = 5.0±0.05V 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 x RL
VRL
For information on warranty, please refer to Standard Terms and Conditions of Sale of
Figaro USA Inc.
REV: 9/99
Bottom view
FIGARO USA, INC.
3703 West Lake Ave. Suite 203
Glenview, Illinois 60025
Phone: (847)-832-1701
Fax: (847)-832-1705
email: figarousa@figarosensor.com


Part Number TGS2611
Description The detection of Methane
Maker Figaro
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TGS2611 Datasheet PDF






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