Sensing
element
ø9.2±0.2
12.4±1.0
10.0±1.0
3.6±0.1
1
2
3
4
3.6±0.1
ø8.1±0.2
ø0.55±0.05
ø5.1
90˚
Structure and Dimensions:
Basic Measuring Circuit:
REV: 07/09
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
specic 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 fulll 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.
Specications (tentative):
Bottom view
Top view
Side view
The value of power dissipation (PS) can
be calculated by utilizing the following
formula:
PS =
Sensor resistance (Rs) is calculated with
a measured value of VRL by using the
following formula:
RS = x RL
VC - VRL
VRL
(VC - VRL)2
RSFIGARO USA, INC.
121 S. Wilke Rd. Suite 300
Arlington Heights, IL 60005
Phone: (847)-832-1701
Fax: (847)-832-1705
email: garousa@garosensor.com
For information on warranty, please refer to Standard Terms and Conditions of Sale of Figaro
USA Inc. All sensor characteristics shown in this brochure represent typical characteristics.
Actual characteristics vary from sensor to sensor. The only characteristics warranted are those
in the Specication table above.
u/m:mm
Model number TGS2612
Sensing element type D1
Standard package TO-5 metal can
Target gases Methane, propane, iso-butane
Typical detection range 1 ~ 25%LEL of each gas
Standard circuit
conditions
Heater voltage VH5.0±0.2V AC/DC
Circuit voltage VC5.0±0.2V DC/AC Ps≤15mW
Load resistance RLvariable 0.45kΩ min.
Electrical
characteristics
under standard test
conditions
Heater resistance RHapprox 59Ω at room temp.
Heater current IH56±5mA
Heater power
consumption PH280mW VH=5.0V DC
Sensor resistance RS0.68 ~ 6.8kΩ in 5000ppm methane
Sensitivity
(change ratio of Rs) 0.50~0.65 Rs (9000ppm)
Rs (3000ppm)
Standard test
conditions
Test gas conditions Methane, propane, iso-butane in air
at 20±2˚C, 65±5%RH
Circuit conditions Vc = 5.0±0.01V DC
VH = 5.0±0.05V DC
Conditioning period
before test 7 days