PRODUCT INFORMATION TGS 2612-D00 - for the detection of Methane and LP Gas Features: * Similar sensitivity at same %LEL levels for both methane and LP gas * Low power consumption * Long life and low cost * Uses simple electrical circuit * Residential LNG and LPG alarms * Portable combustible gas leak detectors * Detectors for LNG and LPG 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 2612-D00 has high sensitivity to methane, propane and butane, making it ideal for LNG and LPG monitoring. Due to its low sensitivity to alcohol vapors (a typical interference gas in the residential environment), the sensor is ideal for consumer market gas alarms. Due to miniaturization of the sensing chip, TGS 2612-D00 requires a heater current of only 56mA 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 5000ppm of methane 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 5000ppm of methane at various atmosperic conditions Ro = Sensor resistance in 5000ppm of methane at 20°C and 65%RH Sensitivity Characteristics: Temperature and Humidity Dependency: 100 10 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

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 ofvoltage Vout(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...