PRODUCT INFORMATION
PRODUCT INFORMATION
Applications:
Features:
TGS 2620 - for the detection of Solvent Vapors
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
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 is indicated as
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.
* 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. It also has sensitivity to a variety of combustible gases
such as carbon monoxide, making it a good general purpose sensor.
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
PRODUCT INFORMATION
Structure and Dimensions:
Basic Measuring Circuit:
REV: 01/05
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
specific temperature which is optimal for
sensing. Circuit voltage (VC) is applied
to allow measurement of voltage (VRL)
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 fulfill 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.
Specifications:
rebmunledoM 00C-0262SGT
epyttnemelegnisneS 1D
egakcapdradnatS naclatem5-OT
sesagtegraT sropavtnevloS,lohoclA
egnarnoitcetedlacipyT mpp000,5~05
tiucricdradnatS
snoitidnoc
egatloVretaeH
V
H
0.5 ±CA/CDV2.0
egatlovtiucriC V
C
0.5 ±CA/CDV2.0
sP ≤Wm51
ecnatsiserdaoL
R
L
elbairaV k54.0 Ω.nim
lacirtcelE
scitsiretcarahc
tsetdradnatsrednu
snoitidnoc
ecnatsiserretaeH
R
H
38 Ω.pmetmoorta
)lacipyt(
tnerrucretaeH
I
H
24 ±Am4
rewopretaeH
noitpmusnoc
P
H
Wm012.xorppa
ecnatsiserrosneS sR k5~1 Ωlonahtempp003ni
ytivitisneS
)sRfooitaregnahc( 5.0~3.0 )mpp003(sR
)mpp05(sR
tsetdradnatS
snoitidnoc
snoitidnocsagtseT rianiropavlonahtE
02ta ±56,C˚2 ±HR%5
snoitidnoctiucriC V
C
0.5= ±CDV10.0
V
H
0.5= ±CDV50.0
doirepgninoitidnoC
tseterofeb syad7
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 VRL by using the
following formula:
RS = x RL
VC - VRL
VRL
(VC - VRL)2
RS
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
For information on warranty, please refer to Standard Terms and Conditions of Sale of
Figaro USA Inc.
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
