Investigation of the Sensitivity and Selectivity of a Thermocatalytic Sensor of Hydrogen

The study demonstrates for the first time the high selectivity of catalytic hydrogen sensors to other hydrocarbons (methane, propane, hexane, butane, ethane and ethylene) at an operating temperature less than 70 ºС. Two circuits were used to measure the response of sensors: a Wheatstone bridge circuit and a divider circuit. The hydrogen measurement was conducted at the temperatures ranging from 66 to130 ºС. It is shown that the sensors have a high sensitivity of 25–35 mV/% and a low power consumption of approximately 8.6 mW. The Wheatstone bridge circuit was observed to have the maximum value of selectivity and sensitivity.