Which checks should be performed before using the CSE 102 methane detector?

The correct checks to perform before using the CSE 102 methane detector include a visual inspection, a battery-voltage test, and an electrical-zero test.

A visual inspection is crucial because it helps to identify any obvious physical damage or issues with the device that could affect its functionality. Ensuring that the detector is in good physical condition is vital for reliable operation.

The battery-voltage test is important to confirm that the detector has enough power to function correctly. A low battery may lead to inaccurate readings or a failure to operate, which can have serious safety implications in a mining environment.

Conducting an electrical-zero test is essential for calibrating the device to ensure it provides accurate readings. This test checks that the detector is properly zeroed out before it is used to measure methane levels, allowing for precise detection of gas concentrations.

While the other options may include important checks, they do not encompass the comprehensive set required for safe and effective use of the methane detector before entering potentially hazardous conditions.