PRODUCT INFORMATION
Applications:
Features:
TGS 2620 - for the detection of Solvent Vapors
The gure 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
resistance ratio (Rs/Ro) which is dened as follows:
Rs = Sensor resistance in displayed gases at
various concentrations
Ro = Sensor resistance in 300ppm of ethanol
The gure below represents typical temperature and humidity
dependency characteristics. Again, the Y-axis is indicated as
sensor resistance ratio (Rs/Ro), dened 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.
* Alcohol testers
* Organic vapor detectors/alarms
* Solvent detectors for factories, dry cleaners,
and semiconductor industries
The sensing element is comprised of a metal oxide semiconductor layer
formed on an alumina substrate of a sensing chip together with an integrated
heater. In the presence of a detectable gas, the sensor's conductivity increases
depending on the gas concentration in the air. A simple electrical circuit can
convert the change in conductivity to an output signal which corresponds to
the gas concentration.
The TGS 2620 has high sensitivity to the vapors of organic solvents as well
as other volatile vapors, making it suitable for organic vapor detectors/alarms.
Due to miniaturization of the sensing chip, TGS 2620 requires a heater current
of only 42mA and the device is housed in a standard TO-5 package.
* Low power consumption
* High sensitivity to alcohol and organic
solvent vapors
* Long life and low cost
* Uses simple electrical circuit
Temperature/Humidity Dependency:
Sensitivity Characteristics:
0
1
10
100
10 100 1000 10000
Rs/Ro
Gas concentration (ppm)
Air
Methane
CO
Iso-butane
Hydrogen
Ethanol
0.1
1
10
-20 -10 0 10 20 30 40 50
35%
50%
65%
96%
Rs/Ro
Ambient temperature (˚C)
Gas: 300ppm Ethanol
RH%:
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.
PRODUCT INFORMATION
Structure and Dimensions:
Basic Measuring Circuit:
REV: 08/14
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
specic temperature which is optimal
for sensing. Circuit voltage (VC) is
applied to allow measurement of voltage
(VOUT) 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 fulll the
sensor's electrical requirements. The
value of the load resistor (RL) should be
chosen to optimize the alarm threshold
value, keeping power consumption (PS)
of the semiconductor below a limit of
15mW. Power consumption (PS) will be
highest when the value of Rs is equal
to RL on exposure to gas.
Specications:
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 VOUT(VRL) by using
the following formula:
RS = ( -1) x RL
VC
VRL
(VC - VRL)2
RS
Top view
Side view
Bottom view
Sensing
element
ø9.2±0.2
3.6±0.1
1
2
3
4
3.6±0.1
ø8.1±0.2
ø0.55±0.05
ø5.1
90˚
7.8±0.5
10.0±1.0
Pin connection:
1: Heater
2: Sensor electrode (-)
3: Sensor electrode (+)
4: Heater
u/m: mm
Model number TGS2620-C00
Sensing principle MOS-type
Standard package TO-5 metal can
Target gases Alcohol, Solvent apors
Typical detection range 50 ~ 5,000ppm EtOH
Standard circuit
conditions
Heater voltage VH5.0±0.2V AC/DC
Circuit voltage VC5.0±0.2V DC Ps≤15mW
Load resistance RLvariable 0.45kΩ min.
Electrical
characteristics
under standard test
conditions
Heater resistance RH83Ω at room temp.
(typical)
Heater current IH42±4mA
Heater power
consumption PH210mW (typical)
Sensor resistance RS1kΩ ~ 5kΩ in 300ppm ethanol
Sensitivity
(change ratio of Rs)
0.3~0.5
in ethanol
Rs (300ppm)
Rs (50ppm)
Standard test
conditions
Test gas conditions Ethanol vapor 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
FIGARO ENGINEERING INC.
1-5-11 Senba-nishi
Mino, Osaka 562 JAPAN
Phone: (81)-727-28-2561
Fax: (81)-727-28-0467
email: garo@garo.co.jp