tgs6812
PRODUCT INFORMATION
TGS 6812 - for the detection of Hydrogen, Methane, and LP Gas
Features:
Applications:
* Linear output
* Compact size
* Small sensitivity to alcohol
* Sensitive to hydrogen, methane, and
LP gas
* Meets RoHS requirements
* Hydrogen and combustible gas leak
detectors for fuel cells
The TGS6812 catalytic type gas sensor can detect levels of hydrogen up to
100%LEL. This sensor features high accuracy, good durability and stability,
quick response, and linear output. This sensor can detect not only hydrogen,
but also methane and LP gas, thus making it an excellent solution for monitoring
gas leakage from staionary fuel cell systems which transform combustible
gases into hydrogen.
As the sensor possesses an adsorbent inside its sensor cap, its cross sensitivity
to alcohol is much smaller than traditional catalytic type sensors. In addition,
TGS6812 is more durable against silicone compounds than tradit-ional catalytic
type sensors.
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
output sensitivity -- ∆Vout (mV):
∆Vout = Vout in gas - Vout in air
The figure below represents typical temperature dependency
characteristics at 65%RH. Again, Y-axis is indicated as sensor
output sensitivity -- ∆Vout (mV):
∆Vout = Vout in gas - Vout in air at 20˚C
Sensitivity Characteristics:
Temperature Dependency:
100
50
Iso-butane
80
Propane
40
30
H2
60
Methane
∆Vout (mV)
Air
5000ppm Methane
1800ppm Iso-butane
4000ppm Hydrogen
∆Vout (mV)
20
40
10
20
0
Air
Ethanol
0
0
5000
10000
15000
Gas concentration (ppm)
20000
25000
at 65% RH
-10
-10
0
10
20
30
40
50
60
70
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.
VH(3.0V)
Basic Measuring Circuit:
The TGS6812 is comprised of two
elements: 1) element (D) which is
sensitive to combustible gases and
2) a reference element (C) which is
not sensitive to combustible gases.
These elements are installed into a
“Wheastone Bridge”. A variable resistor
should be adjusted so that the bridge will
produce a stable baseline signal when
in an environmnet free of combustible
gases. When combustible gases are
present, they will be combusted on
the detecting element, causing its
temperature to rise. Accordingly the
resistance of this element will increase.
This results in an “out-of-balance” signal
across the bridge and a corresponding
change in output voltage which can be
measured.
TGS 6812
Sensing element type
Catalytic
Target gases
Hydrogen, methane, iso-butane
Typical detection range
0~100%LEL of each gas
Operating Voltage
3.0±0.1V AC/DC
Heater current
175mA (typical)
Heater power
consumption
525mW (typical)
Zero offset
Output sensitivity
(∆Vout)
Response time (90%)
Test gas conditions
Standard test
conditions
Circuit conditions
Conditioning period
before test
±35mV
hydrogen
12~18mV in
4000ppm
methane
12~18mV in
5000ppm
iso-butane
7~11mV in
1800ppm
≤15 sec.
Hydrogen/methane/iso-butane in air
at 20±2˚C, 65±5%RH
3.0±0.05V AC/DC
C
VR
4
Vout
3
D
R2
2
Detector Side
Top view
Compensator Side
ø12.6
ø12.1
9.4
Cap
(Reinforced PBT)
Side view
ø12.0
5.0
Base
(Reinforced PBT)
ø0.8
Lead pin
Detector Side
3
2
4.6
Bottom view
4
1
3.6
Compensator Side
≤30 sec.
Operating conditions
-10~+70˚C, ≤99%RH
(w/o dew condensation)
Storage conditions
-10~+80˚C, ≤99%RH
(w/o dew condensation)
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 Specification table above.
REV: 09/06
1
Structure and Dimensions:
Model number
Electrical
characteristics
under standard test
conditions
R1
TGS6812
GND
Specifications
Standard circuit
conditions
Typical values:
R1 = 1k ohm
R2 = 1k ohm
VR =200 ohm
u/m = mm
<Pin connection>
1-4 : Compensator
2-3 : Detector
FIGARO USA, INC.
121 S. Wilke Rd. Suite 300
Arlington Heights, Illinois 60005
Phone: (847)-832-1701
Fax:
(847)-832-1705
email: figarousa@figarosensor.com
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