Before starting an inspection, what is essential to do with the CGI?

Before starting an inspection, it is crucial to purge the combustible gas indicator (CGI) in a gas-free atmosphere. This step ensures that any potential residues or contaminants from previous use do not interfere with the accuracy of the readings during the inspection. By purging the CGI, you eliminate residual gases, thereby allowing the device to function optimally and reliably detect any present combustible gases without false readings that could arise from lingering substances.

Calibration and setting to maximum sensitivity are important steps in the overall process of preparing a gas detection device, but they would typically follow the initial purging in a gas-free atmosphere to ensure that the device is in the best condition to provide accurate measurements. Conducting a self-test is also essential, but this usually comes after ensuring that the instrument is properly purged and ready for operation. Thus, starting the process with purging is fundamental to ensure that accurate and reliable data will be collected during the inspection.