System and method for gas reuse in testing of hazardous gas detecting instruments

A portable gas detector test fixture, comprising:

• a test chamber;
• a processor;
• a test gas container storing a test gas;
• a docking connector communicatively coupled to the processor;
• an output device communicatively coupled to the processor;
• a memory communicatively coupled to the processor;
• an application stored in the memory that, when executed by the processor, is configured to determine an aging of the test gas stored in the test gas container and to provide a notification to a user via the output device indicating when the test gas container should be replaced based on the determined aging of the test gas, wherein the aging of the test gas is caused by a degradation of the test gas over time;
• an inflow pump configured to connect to a test gas source line of the test gas container, where the inflow pump is coupled to the test chamber;
• and
• an outflow pump configured to connect to a test gas return line of the test gas container, wherein the outflow pump is coupled to the test chamber, wherein the test gas is returned to the test gas container and reused.