Abstract: The present disclosure relates to a system for changing a safety-relevant configuration value of a gas measuring device, comprising the gas measuring device and an operating unit that is connected to the gas measuring device for bidirectional data transmission, wherein the operating unit is designed to send a configuration value to the gas measuring device. The present disclosure is characterized in that the gas measuring device is designed to generate a request message for manual input confirming the configuration value and send it to the operating unit, furthermore to receive a response message with information about the manual input from the operating unit, and furthermore to compare the information about the manual input with an expected value and generate an information signal and/or switch to a safe state if the information about the manual input deviates from the expected value.

Abstract: A heat tone sensor includes a housing with a gas inlet and with a gas outlet as well as a device for generating a gas stream of a gas to be tested between the gas inlet and the gas outlet. A measuring element, around and/or through which the gas stream flows, is configured to catalytically burn at least a portion of the gas stream and to send a measurement signal. The measurement signal indicates a quantity of heat released in the process.

Abstract: A gas measuring device (100, 400). The gas measuring device (100, 400) includes a chemical gas sensor (103, 417) and a testing unit (101). The testing unit (101) includes a base, a gas duct arrangement arranged at the base with a first gas duct (111, 401) and with at least one additional gas duct (113, 405) and at least one electrochemical gas generator (105, 403, 407). The at least one gas generator (105, 403, 407) is configured to send at least one test gas into the first gas duct (111, 401) in a first state and into the at least one additional gas duct (113, 405) in an additional state. The first gas duct (111, 401) and the at least one additional gas duct (113, 405) are each configured to send at least one gas to the gas sensor (103, 417). The first gas duct (111, 401) differs from the at least one additional gas duct (113, 405).

Abstract: A process (100) for adjusting a gas supply system (300, 400) includes a calibration step for calibrating (101) a gas sensor (303, 401) at a first calibration time (t1) with a defined concentration of test gas. A first calibration result (S1) is determined during the calibration. At least one gas supply measured value (M1) is determined at a time (t2) preceding the first calibration time (t1). A determination step determines (103) a gas supply reference value (G1) by the at least one gas supply measured value (M1) being put into a mathematical relationship with the first calibration result (S1) and with a calibration result (S0) of the gas sensor (303, 401), which was determined at a time preceding the first calibration time (t1). An adjustment step adjusts (105) the gas supply system on the basis of the gas supply reference value (G1).

Abstract: A heat tone sensor includes a housing with a gas inlet and with a gas outlet as well as a device for generating a gas stream of a gas to be tested between the gas inlet and the gas outlet. A measuring element, around and/or through which the gas stream flows, is configured to catalytically burn at least a portion of the gas stream and to send a measurement signal. The measurement signal indicates a quantity of heat released in the process.