What should be ensured during the calibration of gas detection instruments?

Calibration of gas detection instruments is critical to ensure their accuracy and reliability. The correct choice emphasizes the importance of calibrating these instruments in a stable environment. A stable environment minimizes fluctuations in temperature, humidity, and other variables that could affect the performance of the gas detection devices.

When calibrated in a controlled and stable setting, the instruments can be adjusted to give precise readings, which is essential for effective monitoring of hazardous gases in mining operations. Stability during calibration enhances the consistency of measurements and reduces the likelihood of false readings, which could lead to unsafe conditions for workers.

In contrast, calibrating in darkness or wet conditions could introduce variables that may skew the readings and compromise the instrument's reliability. Moreover, calibration during operation could mean that fluctuations in gas concentration or other factors present during actual work conditions may impact the calibration process, leading to inaccurate results. Therefore, ensuring a stable environment for calibration is vital for maintaining the integrity and effectiveness of gas detection instruments used in mining activities.