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PRODUCT INFORMATION
TGS 2602 - for the detection of Air Contaminants
* High sensitivity to VOCs and odorous gases * Low power consumption * High sensitivity to gaseous air contaminants * Long life * Uses simple electrical circuit www..com * Small size
Features:
Applications:
* Air cleaners * Ventilation control * Air quality monitors * VOC monitors * Odor monitors
The sensing element is comprised of a metal oxide semiconductor layer formed on the alumina substrate of a sensing chip together with an integrated heater. In the presence of detectable gas, sensor conductivity increases depending on 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 2602 has high sensitivity to low concentrations of odorous gases such as ammonia and H2S generated from waste materials in office and home environments. The sensor also has high sensitivity to low concentrations of VOCs such as toluene emitted from wood finishing and construction products. Figaro also offers a microprocessor (FIC02667) which contains special software for handling the sensor's signal for appliance control applications. Due to miniaturization of the sensing chip, TGS 2602 requires a heater current of 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 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 fresh air Sensitivity Characteristics:
10
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 fresh air at various temperatures/humidities Ro = Sensor resistance in fresh air at 20C and 65% R.H. Temperature/Humidity Dependency:
10
1 Rs/Ro 0.1
Air Hydrogen Ammonia Ethanol
40% R.H. 65% R.H. 85% R.H.
Hydrogen sulfide
Rs/Ro 1
Toluene
0.01
0.1
0.1
1 10 Gas concentration (ppm)
100
0
10
20 30 40 50 Ambient temperature (C)
60
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.
Basic Measuring Circuit:
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 (Vout) across a load resistor (RL) which is connected in series with the sensor. DC voltage is required for the circuit
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voltage since the sensor has a polarity. 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:
Model number TGS 2602-B00
Structure and Dimensions:
0.9 0.9
Sensing element type
D1
Top view
1.6 1.6
Standard package
TO-5 metal can
Target gases
Typical detection range
Heater voltage
VH
Air contaminants
1 ~ 30 ppm of EtOH
5.00.2V DC/AC
o9.20.2 o8.10.2
o0.5 x 6
Standard circuit conditions
Circuit voltage
VC
5.00.2V DC
Ps15mW
Sensing element
Load resistance
RL
Variable
0.45k min.
7.80.5
Heater resistance
RH
IH
approx. 59 at room temp.
565mA
Side view
Electrical characteristics under standard test conditions
Heater current
Heater power consumption
10.01.0
PH
280mW (typical)
Sensor resistance
Sensitivity (change ratio of Rs)
Rs
10k~100k in air
0.15~0.5
Rs (10ppm of EtOH) Rs (air)
o0.550.05
3.60.1
Test gas conditions
Standard test conditions
normal air at 202C, 655%RH
VC = 5.00.01V DC VH = 5.00.05V DC
7 days
Bottom view
90
Circuit conditions
Conditioning period before test
4 3
1 2
3.60.1 o5.1
The value of power consumption (PS) can be calculated by utilizing the following formula: PS = (VC - Vout)2 RS
Sensor resistance (Rs) is calculated with a measured value of Vout by using the following formula: RS = VC x RL - RL Vout
u/m:mm Pin connection: 1: Heater 2: Sensor electrode (-) 3: Sensor electrode (+) 4: Heater
For information on warranty, please refer to Standard Terms and Conditions of Sale of Figaro USA Inc. All sensor characteristics shown in this brochure represent typical characteristics. Actual characteristics vary from sensor to sensor. The only characteristics warranted are those in the Specification table above.
FIGARO USA, INC. 121 S. Wilke Rd. Suite 300 Arlington Heights, IL 60005 Phone: (847)-832-1701 Fax: (847)-832-1705
e-mail: figarousa@figarosensor.com
REV: 01/05

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