Gas measuring device

A tester for a gas measuring device, the tester comprising:

• a testing unit comprising:
• a gas duct arrangement comprising a gas duct structure;
• and
• a gas generator configured to send test gas into a sensor chamber of a gas sensor in a first time period of a test of the testing unit and in a second time period of the test of the testing unit via the gas duct arrangement, wherein:
• a transportation of test gas has a different transportation characteristic during the first time period than during the second time period;
• and
• the different transportation characteristic is based on the gas duct structure, or is based on a property of the test gas transported, or is based both on the gas duct structure and a property of the test gas transported;
• and
• a connection interface configured to provided a reversible operative connection with the gas sensor.

A testing process for testing a gas measuring device, wherein the testing process comprises the steps of:

• providing a gas measuring device comprising:
• a chemical gas sensor comprising:
• a sensor chamber, the sensor reacting an analyte enclosed within the sensor chamber;
• and an opening area, which forms a gas-permeable connection between the sensor chamber and an environment of the gas measuring device;
• and a testing unit comprising:
• a gas duct arrangement;
• and a gas generator configured to send test gas into the sensor chamber of the gas sensor in a first time period of a test of the testing unit and in a second time period of the test via the gas duct arrangement, wherein:
• a transportation of test gas has a different transportation characteristic during the first time period than during the second time period;
• and the different transportation characteristic is based on a gas duct structure of the gas duct arrangement, or is based on a property of the test gas transported, or is based both on a gas duct structure of the gas duct arrangement and a property of the test gas transported;
• actuating the gas generator such that the gas generator sends test gas into the enclosing sensor chamber of the gas sensor via the gas duct arrangement during a first time period of a test and during a second time period of the test;
• determining measured values during the first time period, or determining measured values during the second time period or determining measured values during both the first time period and the second time period;
• and
• determining test information and outputting test information during the first time period or during the second time period or during both the first time period and the second time period, wherein:
• the test information indicates whether the gas measuring device is defective;
• and
• the determination of the test information is based on a comparison between the measured value or a parameter calculated therefrom and a predefined gas sensor threshold value or between a determined measured value relationship parameter and a predefined relationship parameter.