PRODUCT INFORMATION TGS 6812-D00 - for the detection of Hydrogen, Methane, and LP GasFeatures: Applications: * Linear output * Hydrogen and combustible gas leak * Long life detectors for fuel cells * Small sensitivity to organic vapors * Sensitive to hydrogen, methane, and LP gas The TGS6812-D00 catalytic type gas sensor can detect levels of hydrogen up to 100%LEL. This sensor features high accuracy, good durability and stability, quick response, and linear output. This sensor can detect not only hydrogen, but also methane and LP gas, thus making it an excellent solution for monitoring gas leakage from stationary fuel cell systems which transform combustible gases into hydrogen. As the sensor possesses an adsorbent inside its sensor cap, its cross sensitivity to organic vapors is small. In addition, TGS6812-D00 is durable against silicone compounds in harsh environments. The figure below represents typical sensitivity characteristics, The figure below represents typical temperature dependency all data having been gathered at standard test conditions (see characteristics at 65%RH. Again, Y-axis is indicated as sensor reverse side of this sheet). The Y-axis is indicated as sensor output sensitivity -- AVout (mV): output sensitivity -- AVout (mV): AVout = Vout in gas - Vout in air at 20°C AVout = Vout in gas - Vout in air 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 SP

Basic Measuring Circuit: The TGS6812 is comprised of two elements: 1) element (D) which is sensitive to combustible gases and 2) a reference element (C) which is not sensitive to combustible gases. These elements are installed into a “Wheastone Bridge”. A variable resistor should be adjusted so that the bridge will produce a stable baseline signal when in an environmnet free of combustible gases. When combustible gases are present, they will be combusted on the detecting element, causing its temperature to rise. Accordingly the resistance of this element will increase. This results in an “out-of-balance”...