u/Ruposhlapata

Help needed! I HAVE TO PERFORM CALIBRATION OF GAS DETECTORS CLOSED PATH.

I HAVE DONE CALIBRATION OF GAS DETECTORS (OPEN PATH) BUT NEVER CLOSED PATH.

I HAVE QUESTION THAT, DO I NEED GAS CYLINDER FOR IT? SINCE IT IS CLOSED PATH GAS DETECTORS. CAN ANYONE GUIDE ME, I WOULD REALLY APPRECIATE IT.