PRODUCT INFORMATIONTGS 2620 - for the detection of Solvent Vapors
Features:

Applications:* Low power consumption* High sensitivity to alcohol and organic
solvent vapors* Long life and low cost
* Uses simple electrical circuit* Organic vapor detectors/alarms* Solvent detectors for factories, dry cleaners,
and semiconductor industries* Safety measures for lithium-ion batteries

The sensing element is comprised of a metal oxide semiconductor layer
formed on an alumina substrate of a sensing chip together with an integratedheater. In the presence of a detectable gas, the sensor's conductivity increases
depending on the gas concentration in the air. A simple electrical circuit canconvert the change in conductivity to an output signal which corresponds tothe gas concentration.
The TGS 2620 has high sensitivity to the vapors of organic solvents as wellas other volatile vapors, making it suitable for organic vapor detectors/alarms.
Due to miniaturization of the sensing chip, TGS 2620 requires a heater currentof only 42mA and the device is housed in a standard TO-5 package.

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 indicates sensor
resistance ratio (Rs/Ro) which is defined as follows:
Rs = Sensor resistance in displayed gases at		various concentrations
Ro = Sensor resistance in 300ppm of ethanol

The figure below represents typical temperature and humidity
dependency characteristics. Again, the Y-axis indicates sensor
resistance ratio (Rs/Ro), defined as follows:
Rs = Sensor resistance in 300ppm of ethanol		at various temperatures/humidities
Ro = Sensor resistance in 300ppm of ethanol		at 20°C and 65% R.H.

Sensitivity Characteristics:

Temperature/Humidity Dependency:
1010035%50%
65%
96%

RH%:

Air
10Methane

Rs/Ro

1Rs/Ro1CO
Iso-butane
Hydrogen
Ethanol

0101001000
Gas concentration (ppm)

10000

Gas: 300ppm Ethanol

0.1-20-1001020304050Ambient 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 TARGETGASES ARE NOT LISTED HEREIN. FIGARO CANNOT ASSUME ANY RESPONSIBILITY FOR ANY USE OF ITS SENSORS IN A PRODUCT OR APPLICATION FOR WHICH SENSOR HASNOT BEEN SPECIFICALLY TESTED BY FIGARO.

PRODUCT INFORMATION

Basic Measuring Circuit:
The sensor requires two voltage inputs:
heater voltage (VH) and circuit voltage(VC). The heater voltage (VH) is appliedto the integrated heater in order tomaintain the sensing element at a
specific temperature which is optimalfor sensing. Circuit voltage (VC) isapplied to allow measurement of voltage(VOUT) across a load resistor (RL) whichis connected in series with the sensor.

(+)

A common power supply circuit canbe used for both VC and VH to fulfill thesensor's electrical requirements. The
value of the load resistor (RL) should bechosen to optimize the alarm thresholdvalue, keeping power consumption (PS)of the semiconductor below a limit of15mW. Power consumption (PS) will behighest when the value of Rs is equal
to RL on exposure to gas.

34VC

TGS2620-C00

Sensing principle

MOS-typeStandard package

TO-5 metal canTarget gases

Alcohol, Solvent apors

Typical detection range

50 ~ 5,000ppm EtOH

( )Ps≤15mW

Load resistanceRL

variable

0.45kΩ min.

Heater resistanceRH

83Ω at room temp.
(typical)Heater current

IH

42±4mA

Heater power
consumption

PH

210mW (typical)

Sensor resistance

RS1kΩ ~ 5kΩ in 300ppm ethanol
0.3~0.5in ethanolSide view

Preheating period
before test

7 days

3.6±0.1
Bottomview
Bottomview

Sensor resistance (Rs) is calculated witha measured value of VOUT(VRL) by using
the following formula:( VVCRL-1) xRL

Before purchasing this product,
please read the Warranty Statements
shown in our webpage by scanning
this QR code.
https://www.figaro.co.jp/en/pdf/Limited_Warranty_en.pdf

4132

Bottom view
3.6±0.1

Circuit conditions

Vc = 5.0±0.01V DC
VH = 5.0±0.05V DC

φ0.55±0.05

90°Ethanol vapor in air
at 20±2˚C, 65±5%RH

RS =Side view

Rs (300ppm)
Rs (50ppm)

Test gas conditions(VC - VRL)2RSSide view

φ5.1

u/m:mmu/m : mm

Pin connection:
1: Heater
2: Sensor electrode (-)
3: Sensor electrode (+)
4: Heater

FIGARO ENGINEERING INC.
1-5-11 Senba-nishi
Mino, Osaka 562-8505 JAPAN
Phone: (81)-727-28-2045
URL：www.figaro.co.jp/en/

90°

5.0±0.2V DC

φ9.2±0.2
φ8.1±0.2

5.0±0.2V DC

7.8±0.5

VC

Top view

10.0±1.0

Circuit voltage

All sensor characteristics shown in this brochurerepresent typical characteristics. Actualcharacteristics vary from sensor to sensor. The
only characteristics warranted are those in theSpecification table above.

REV: 01/24(VRL)

Top view

VH

The value of power dissipation (PS) canbe calculated by utilizing the following
formula:		 PS =		VOUTRL

Top view

Heater voltage

Sensitivity(change ratio of Rs)

Standard test
conditions

GAS

Structure and Dimensions:

Model number

Electricalcharacteristics
under standard test
conditions

1
2

Specifications:Standard circuit
conditions

RSRH

VH