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TECHNICAL INFORMATION FOR TGS6810-D00
Technical Information for Methane & LP Gas Sensors
The Figaro TGS6810-D00 catalytic
type gas sensor, which can detectboth methane and LP gas, hasbeen developed for residential
gas detection. This sensor featureshigh accuracy, good durability
and stability, quick response,
and linear output, making them
ideal for the detection of many
combustible gases.

Page
Basic Information and Specifications
Features..........................................................................2
Applications...................................................................2
Structure..........................................................................2
Basic Measuring Circuit....................................................2
Circuit & Operating Conditions.........................................3
Specifications..............................................................................3
Dimensions...............................................................................3
Typical Sensitivity Characteristics
Sensitivity to Various Gases................................................4
Temperature Dependency...........................................................4
Humidity Dependency...........................................................4
Heater Voltage Dependency.............................................5
Gas Response....................................................................................5
Initial Action........................................................................5
Reliability
Long Term Characteristics.............................................................6
Durability to Hydrogen.......................................................................6
Durability to Sulphur Dioxide...........................................................6
Durability to Nitrogen Dioxide.........................................................7
Durability to HMDS....................................................................7
Effects of Air Flow.............................................................................7
Cautions............................................................................................................8
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 CANNOTASSUME ANY RESPONSIBILITY FOR ANY USE OF ITS SENSORS IN A PRODUCT OR APPLICATION FOR
WHICH A SENSOR HAS NOT BEEN SPECIFICALLY TESTED BY FIGARO.

Revised 08/22

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TECHNICAL INFORMATION FOR TGS6810-D00
1. Basic Information and Specifications

Top view
Detector

1-1 Features

Compensator* Linear output* Long life
* Small sensitivity to alcohol* Sensitive to methane and LP gas
1-2 Applications* Residential LNG and LPG alarms* Detectors for LNG and LPG

BaseMetal gauze

Filter

1-3 Structure

Side view

Figure 1 shows the structure of TGS6810-D00.
The sensor is comprised of two elements: element(D) which is sensitive to combustible gases, and areference element (C) which does not have sensitivity
to combustible gases. The sensing element (D) is madeof alumina doped with catalysts, while the reference
element (C) is made of alumina. Both coils are madeof Pt wire, and the wires of both elements (D) and (C)are connected to nickel pins No. 2 & 3 and No. 1 & 4
respectively. The sensor base is made of reinforced
Polybutylene Terephthalate (PBT) while the sensor
cap is made of Nylon 66. The upper opening in
the cap is covered with a double layer of 100 meshstainless steel gauze (SUS316). The TGS6810-D00
utilizes a proprietary filter material inside the cap for
reducing the influence of interference gases.

Coil

Cap
(Nylon 66)

Base(Reinforced PBT)

Lead pin

Fig. 1 - Sensor structure

1-4 Basic measuring circuit
The TGS6810 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 “Wheatstone Bridge”. A variable resistor
should be adjusted so that the bridge will produce astable baseline signal when in an environment freeof combustible gases. When combustible gases arepresent, 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 acorresponding change in output voltage which canbe measured.

Revised 08/22

Typical values:
R1 = 1.2kΩ
R2 = 1.2kΩ
VR = 100Ω

VH(3.0V)

TGS6810

R1

1

C

VR

4
3

D

Vout
R2

2

GND

Fig. 2 - Basic measuring circuit

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TECHNICAL INFORMATION FOR TGS6810-D00
1-5 Circuit & operating conditions

1-7 Dimensions

The ratings shown below should be maintained at all
times to insure stable sensor performance:
Specification

Operating voltage

3.0V±0.1V DC

Operating conditions-10˚C ~ +50˚C. 95%RH(w/o dew condensation)

Typical detection concentration-10˚C ~ +60˚C. 95%RH(w/o dew condensation)

Zero offset

Side view

φ12.0±0.2

0 ~ 100%LEL ofmethane/iso-butane
Cap(Nylon 66)

1-6 Specifications NOTE 1
Item

Compensator side

13.0±0.3

Storage conditions

Top view

Specification
5.0±0.2

Item

Detector side

-15 ~ +55mV

φ12.0±0.2

10~18mVin 5000ppm methane

Base(Reinforced PBT)

φ0.8±0.1

Output sensitivity (∆Vout)

Detector side

5~11mV
in 1800ppm iso-butane
Heater current

Lead pin4.6±0.1

175mA (typical)

41Heater power consumption

Bottom view

3

2525mW (typical)
3.6±0.1

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: VH = 3.0±0.05V DC
Preheating period: 10 minutes or longer under standard
circuit conditions

Compensator side

u/m = mm

<Pin connection>
1-4 : Compensator
2-3 : Detector

Fig. 3 - Sensor dimensions

Mechanical Strength:

All sensor characteristics shown in thisbrochure represent typical characteristics.
Actual characteristics vary from sensor tosensor and from production lot to production
lot. The only characteristics warranted are thoseshown in the Specification table above.
Revised 08/22

The sensor shall have no abnormal findings in
its structure and shall satisfy the above electrical
specifications after the following performance tests:
Vibration - frequency:10~150Hz, acceleration: 2G, duration:10 times,
direction: three dimensions
Drop test - drop onto a cement floor froma height of 250mm, repeated 5
times
3TECHNICAL INFORMATION FOR TGS6810-D00
2. Typical Sensitivity Characteristics

50

2-1 Sensitivity to various gases
Figure 4 shows the relative sensitivity of TGS6810-D00
to various gases. The Y-axis shows sensor output asa measure of sensitivity.

40

Iso-butane
Propane30

20∆Vout (mV)The sensitivity to ethanol, which may act as aninterference gas, is very small.

Methane10
Ethanol
Air

0
0

2000

4000

6000

8000

10000

Gas concentration (ppm)Fig. 4 - Sensitivity to various gases

2-2 Temperature dependency
Figure 5 shows the temperature dependency of
TGS6810-D00 at 65%RH in 10%LEL of methane andLP gas. Since the temperature dependency of element(D) is compensated by element (C), the temperaturedependency of sensor output in the range from -10˚C
to +70˚C is very small.

50

Air
5000ppm Methane
1800ppm Iso-butane

40

30

20
∆Vout (mV)
100at 65% RH

-10
-20

-10

0

10

20

30

40

50

60

Ambient temperature (˚C)

Fig. 5 - Temperature dependency

2-3 Humidity dependency
Figure 6 shows the relative humidity dependency
of TGS6810-D00 under constant temperature of
20˚C in 10%LEL of methane or LP gas. This data
demonstrates that the humidity dependency of
TGS6810-D00 is negligible as humidity varies.

50

Air
5000ppm Methane
1800ppm Iso-butane

40

30

20
∆Vout (mV)
10

0
20˚C
-10
0

20

40

60

80

100

Relative humidity (%RH)

Fig. 6 -Humidity dependency
Revised 08/22

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TECHNICAL INFORMATION FOR TGS6810-D00
2-4 Heater voltage dependency
Figure 7 shows the change in the sensor output
according to variations in the heater voltage (VH).

50

Air
5000ppm Methane
1800ppm Iso-butane

4030Note that 3.0±0.1V as a heater voltage must be
maintained because variance in applied heater
voltage will cause the sensor’s characteristics to bechanged from the typical characteristics shown inthis brochure.

20∆Vout (mV)

10
0

-10
2.90

2.95

3.00

3.05

3.10

Operating voltage (V)Fig. 7 - Heater voltage dependency

2-5 Gas response

As these charts display, the sensor’s response speed
to the presence of gas is extremely quick.

5000ppm Methane
1800ppm Iso-butane

40
30∆Vout (mV)

Figure 8 shows the change pattern of sensor output(Vout) for TGS6810-D00 when the sensor is inserted
into and later removed from gas.

50

20

∆Vout
10 (mV)
0
gas
gas

air

-10
-5

0

5

10

air

15
20
Time (sec.)

25

30

35

Fig. 8 - Gas response

2-6 Initial action
Figure 9 shows the initial action of the sensor output(Vout) for a sensor which is stored unenergized innormal air and later energized in clean air.
The sensor output increases sharply for the firstseconds after energizing, regardless of the presenceof gases, and then reaches a stable level according to
the ambient atmosphere. Such behavior during thewarm-up process is called “Initial Action”.
Since this ‘initial action’ may cause a detector toalarm unnecessarily during the initial moments after
powering on, it is recommended that an initial delay
circuit be incorporated into the detector’s design.
This is especially recommended for intermittentoperating devices such as portable gas detectors.
Revised 08/22

30
25
20
15
10
Vout
5
0
-5
-10
0

20

40
Time (sec.)

60

80

Fig. 9- Initial action

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TECHNICAL INFORMATION FOR TGS6810-D00
3. Reliability
3-1 Long-term characteristics

50

Air
Methane 5000ppm
Isobutane 1800ppm

40

Figure 10 shows long-term stability of TGS6810-D00
as measured for more than 8 years. The sensor
is first energized in normal air. Measurement for
confirming sensor characteristics is conducted understandard test conditions. The Y-axis represents thesensor output (Vout) in air, 5000ppm of methane and1800ppm of isobutane.

30
20∆Vout (mV)

10

0
-10
0

500

1000

1500

2000

2500

3000

Time (days)

The sensor output is very stable over the test period.

Fig. 10 - Long term characteristics

3-2 Durability to hydrogen
Figure 11 shows the effect of long-term highconcentration exposure to hydrogen gas. The
initial point of the graph shows the value of sensor
output prior to hydrogen exposure. After the initial
measurement was taken, the sensor was exposed to
1% of H2 for over 2000 hours. At each measurement
point, the sensor was removed from H2 gas andenergized in normal air for 10 hours prior tomeasuring sensor output.

50

Air
Methane 5000ppm
Isobutane 1800ppm

40
30
20
∆Vout (mV)

10

0
-10
0

Figure 12 shows the effect on TGS6810-D00 of
exposure to SO2. The initial point of the graph shows
the value of sensor output prior to SO2 exposure.
After the initial measurement was taken, the sensor
was exposed to 25ppm of SO2 for over 2400 hours
in total. At each measurement point, the sensor was
removed from SO2 and energized in normal air for
10 hours prior to measuring the sensor output.

Revised 08/22

1500

2000

2500

Fig. 11 - Durability to hydrogen

50

Air
Methane 5000ppm
Isobutane 1800ppm

40
30
20
∆Vout (mV)

10

0
-10
0

The data demonstrates that TGS6810-D00 shows
stable characteristics after exposure to SO2.

1000
Time (hours)

The data demonstrates that TGS6810-D00 shows stablecharacteristics after exposure to high concentrationsof hydrogen.
3-3 Durability to sulphur dioxide

500

500

1000

1500

2000

2500

Time (hours)

Fig. 12 - Durability to SO2

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TECHNICAL INFORMATION FOR TGS6810-D00
3-4 Durability to nitrogen dioxide
Figure 13 shows the effect on TGS6810-D00 of
exposure to NO2. The initial point of the graph shows
the value of sensor output prior to NO2 exposure.
After the initial measurement was taken, the sensor
was exposed to 100ppm of NO2 for over 2400 hours
in total. At each measurement point, the sensor was
removed from NO2 and energized in normal air for
10 hours prior to measuring the sensor output after
removal from NO2.

50

Air
Methane 5000ppm
Iso-butane 1800ppm

40
30
20
Vout(mV)

10
0
-10
0

500

1000

1500

2000

2500

Time (hours)

The data demonstrates that TGS6810-D00 shows
stable characteristics after exposure to NO2.

Fig. 13 - Durability to NO2

3-5 Durability to HMDS
Figure 14 shows the effect on TGS6810-D00 of
exposure to HMDS. The initial point of the graphshows the value of sensor output prior to HMDS
exposure. After the initial measurement was taken,
the sensor was exposed to 10ppm of HMDS for 24hours (36 times the period specified in Item 5.3.13 ofEuropean Standard EN50194). At each measurement
point, the sensor was removed from HMDS andenergized in normal air for 1 hour prior to measuring
sensor output.

50

Air
Methane 5000ppm
Isobutane 1800ppm

40
30
20
Vout (mV)

10

0
-10
0

4

8

12

16

20

24

Time (hours)

This data demonstrates that TGS6810-D00 shows
stable characteristics after exposure to HMDS.

Fig. 14 - Durability to HMDS

3-6 Effects of Air Flow

Air flow direction
1

Table 1 shows how the sensor is affected by airflows(refer to Fig. 15 for illustration of airflows in Table 1). Thisdata demonstrates that there is no significant influenceon the sensor by an air flow of 3.1 meters/sec.
Direction

Flow Rate

Fluctuation of
output in air(mV)

1

3.0m/sec.

approx. ±0.523.0m/sec.

approx. ±0.533.0m/sec.

approx. ±1.043.0m/sec.

approx. ±1.04Detector side
3

Compensator side2

Horizontal

VerticalFig. 15 - Air flow testing direction (ref. Table 1)

Table 1 - Effects of air flow on output voltage
Revised 08/22

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TECHNICAL INFORMATION FOR TGS6810-D00
4 Cautions on Usage of Figaro Gas Sensors
4-1 Situations which must be avoided
1) Exposure to silicone vapors
If silicone vapors adsorb onto the sensor’s surface, thesensing material will be coated, irreversibly inhibiting
sensitivity. Avoid exposure where silicone adhesives,
hair grooming materials, or silicone rubber/putty
may be present.
2) Highly corrosive environment
High density exposure to corrosive materials suchas H2S, SOx, Cl2, HCl, etc. for extended periods may
cause corrosion or breakage of the lead wires orheater material.
3) Contamination by alkaline metals
Sensor drift may occur when the sensor iscontaminated by alkaline metals, especially salt
water spray.
4) Contact with water
Sensor drift may occur due to soaking or splashing
the sensor with water.
5) Freezing
If water freezes on the sensing surface, the sensing
material would crack, altering characteristics.
6) Application of excessive voltage
If higher than specified voltage is applied to thesensor, the lead wires and/or sensor elements may
be damaged or sensor characteristics may drift, even
if no physical damage or breakage occurs.
7) Operation in zero/low oxygen environment
TGS6810 requires the presence of a certain amountof oxygen in its operating environment in order togenerate a combustion reaction of gas on the sensor’s
surface. It cannot properly operate in a zero or low
oxygen content atmosphere.
8) Excessive exposure to alcohol
If TGS6810-D00 is exposed to high concentrationsof alcohol (such as 10,000ppm or more) for a long
period, the filter may become saturated. In this case,the sensor would show a lower resistance in alcohol
than indicated in Figure 4.
9) Vibration
Excessive vibration may result in zero drift or cause
the sensor or lead wires to resonate and break. Usage
Revised 08/22

of compressed air drivers/ultrasonic welders on
assembly lines may generate such vibration, so tests
should be conducted to verify that there will be no
influence on sensor characteristics.
10) ShockZero drift and breakage of lead wires may occur if
the sensor is subjected to a strong shock. To avoid
shock, please keep the sensor in the original packing
foam during storage.
4-2 Situations to be avoided whenever possible
1) Water condensation
Light condensation under conditions of indoor usage
should not pose a problem for sensor performance.
However, if water condenses on the sensor’s
surface and remains for an extended period, sensor
characteristics may drift.
2) Usage in high density of gas
Sensor performance may be affected if exposed
to a high density of gas for a long period of time,
regardless of the powering condition.
3) Storage for extended periods
When stored without powering for a long period,
the sensor may show a reversible drift in resistanceaccording to the environment in which it wasstored. The sensor should be stored in a sealed bag
containing clean air; do not use silica gel. Note thatas unpowered storage becomes longer, a longer preheating
period is required to stabilize the sensor before usage.
4) Long term exposure in adverse environment
Regardless of powering condition, if the sensor
is exposed in extreme conditions such as very
high humidity, extreme temperatures, or highcontamination levels for a long period of time, sensor
performance will be adversely affected.
5) Soldering
Ideally, sensors should be soldered manually.
However, wave soldering can be done under thefollowing conditions:a) Suggested flux: rosin flux with minimal chlorineb) Speed: 1-2 meters/min.
c) Preheating temperature: 100±20˚Cd) Solder temperature: 250±10˚Ce) Up to two passes through wave soldering machine allowed

Results of wave soldering cannot be guaranteed if
conducted outside the above guidelines since some
flux vapors may cause drift in sensor performance
similar to the effects of silicone vapors.
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TECHNICAL INFORMATION FOR TGS6810-D00
Figaro USA Inc. and the manufacturer, Figaro
Engineering Inc. (together referred to as Figaro)
reserve the right to make changes without notice
to any products herein to improve reliability,
functioning or design. Information contained inthis document is believed to be reliable. However,
Figaro does not assume any liability arising out of theapplication or use of any product or circuit describedherein; neither does it convey any license under its
patent rights, nor the rights of others.
Figaro’s products are not authorized for use as criticalcomponents in life support applications wherein afailure or malfunction of the products may result ininjury or threat to life.

Revised 08/22

Before purchasing this product,
please read the Warranty Statements
shown in our webpage by scanning
this QR code.

FIGARO ENGINEERING INC.
1-5-11 Senba-nishi
Mino, Osaka 562-8505 JAPAN
Phone: (81)-727-28-2045

https://www.figaro.co.jp/en/pdf/Limited_Warranty_en.pdf

URL：www.figaro.co.jp/en/

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