TGS2620
2Pages

Catalog excerpts

PRODUCT INFORMATION TGS 2620 - for the detection of Solvent Vapors Features: * Low power consumption * High sensitivity to alcohol and organic solvent vapors * Long life and low cost * Uses simple electrical circuit * 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. 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. Sensitivity Characteristics: 1 CO Iso-butane Hydrogen Ethanol 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 FIGA

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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. 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...

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TGS2620 2Pages

Catalog excerpts

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TGS2620
2Pages