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Figaro
Figaro

TGS-813 Datasheet

Detection of Combustible Gases


TGS-813 Datasheet Preview


TECHNICAL INFORMATION FOR TGS813
Technical Information for Combustible Gas Sensors
Figaro TGS 8-series sensors are a
type of sintered bulk metal oxide
semiconductor which offer low
cost, long life, and good
sensitivity to target gases while
utilizing a simple electrical
circuit. The TGS813 displays
high selectivity and sensitivity to
LP Gas and methane.
Page
Specifications
Features..........................................................................2
Applications...................................................................2
Structure..........................................................................2
Basic measuring circuit....................................................2
Circuit & operating conditions.........................................3
Specifications..............................................................................3
Dimensions...............................................................................3
Basic Sensitivity Characteristics
Sensitivity to various gases................................................4
Temperature and humidity dependency............................5
Heater voltage dependency..........................................................6
Gas response....................................................................................6
Initial action........................................................................7
Long term characteristics.............................................................7
www.daRevtiaseds9/9h9 eet4u.com
See also Technical Brochure ‘Technical Information on Usage of TGS
Sensors for Toxic and Explosive Gas Leak Detectors’.
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.
1
Page 1

TECHNICAL INFORMATION FOR TGS813
1. Specifications
1-1 Features
* General purpose sensor for a wide range of
combustible gases
* High sensitivity to LP gas and methane
* Low cost
* Long life
* Uses simple electrical circuit
1-2 Applications
* Domestic gas leak detectors and alarms
* Recreational vehicle gas leak detectors
* Portable gas detectors
1-3 Structure
Figure 1 shows the structure of TGS813. This sensor
is a sintered bulk semiconductor composed mainly
of tin dioxide (SnO2). The semiconductor material
and electrodes are formed on an alumina ceramic
tube. A heater coil, made of 60 micron diameter wire,
is located inside the ceramic tube. Lead wires from
the sensor electrodes are a gold alloy of 80 microns
in diameter. Heater and lead wires are spotwelded
to the sensor pins which have been arranged to fit a
7-pin miniature tube socket.
The sensor base and cover are made of Nylon 66,
conforming to UL 94HB (Authorized Material
Standard). The deformation temperature for this
material is in excess of 240˚C. The upper and lower
openings in the sensor case are covered with a
flameproof double layer of 100 mesh stainless steel
gauze (SUS316). Independent tests confirm that this
mesh will prevent a spark produced inside the
flameproof cover from igniting an explosive 2:1
mixture of hydrogen/oxygen.
1-4 Basic measuring circuit
Figure 2 shows the basic measuring circuit for use
with TGS813. Circuit voltage (Vc) is applied across
the sensor element which has a resistance between
the sensor’s two electrodes and the load resistor (RL)
connected in series. The sensor signal (VRL) is
measured indirectly as a change in voltage across the
RL. The Rs is obtained from the formula shown at
the right.
Sensor element
Fig. 1 - Sensor structure
Fig. 2 - Basic measuring circuit
Rs =
Vc - VRL
VRL
x RL
Formula to determine Rs
Revised 9/99
2
Page 2

TECHNICAL INFORMATION FOR TGS813
1-5 Circuit &␣ operating conditions
1-7 Dimensions
The ratings shown below should be maintained at
all times to insure stable sensor performance:
Item
Circuit voltage (Vc)
Heater voltage (VH)
Heater resistance (room temp.)
Load resistance (RL)
Sensor power dissipation (Ps)
Specification
Max. 24V AC/DC
5.0V ± 0.2V AC/DC
30 ± 3
Variable (min = [Vc2/60]k)
15mW
Operating & storage temperature
-40˚C ~ +70˚C
Optimal detection concentration
500 ~ 10,000ppm
17ø±0.5
1-6 Specifications NOTE 1
Item
Specification
Sensor resistance (1000ppm methane)
5k~ 15k
Sensor resistance ratio (Rs/Ro)
0.60 ± 0.05
Rs/Ro = Rs(3000ppm methane)/Rs(1000ppm methane)
Heater current (RH)
approx. 167mA
Heater power consumption (PH)
approx. 835mW
9.5ø
61
52
43
Mechanical Strength:
Fig. 3 - Sensor dimensions
The sensor shall have no abnormal findings in its
structure and shall satisfy the above electrical
specifications after the following performance tests:
Withdrawal Force - withstand force > 5kg in each
direction
Vibration - frequency-1000c/min., total
amplitude-4mm, duration-one
hour, direction-vertical
Shock - acceleration-100G, repeated 5
times
NOTE 1: Sensitivity characteristics are obtained
under the following standard test conditions:
(Standard test conditions)
Temperature and humidity: 20 ± 2˚C, 65 ± 5% RH
Circuit conditions: Vc = 10.0±0.1V AC/DC
VH = 5.0±0.05V AC/DC
RL = 4.0kΩ ± 1%
Preheating period: 7 days or more under standard circuit
conditions
Revised 9/99
3
Page 3
Part Number TGS-813
Manufactur Figaro
Description Detection of Combustible Gases
Total Page 8 Pages
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