TGS2611 Datasheet, PDF (2/2 Pages) List of Unclassifed Manufacturers – The detection of Methane

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 59Ω at room temp. (typical)
Electrical
characteristics
under standard test
conditions
Heater current
IH
Heater power
consumption
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 kΩ in 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: [phone]
Fax:
(847)-832-1705
email: [e-mail]