How long should monitoring equipment be calibrated before use in confined spaces?

The correct choice emphasizes the necessity of following the manufacturer’s instructions for calibration and conducting calibration checks before each use of monitoring equipment in confined spaces. This practice is crucial because the working conditions can vary significantly depending on the type of confined space and the potential hazards present, such as toxic gases or low oxygen levels.

Regular calibration ensures that the equipment provides accurate readings, which is essential for maintaining safety. Manufacturer instructions typically outline specific calibration procedures and schedules that take into account factors such as sensor drift, environmental conditions, and the type of gases being measured. Failing to calibrate the equipment regularly can result in inaccurate measurements, potentially leading to hazardous situations.

In contrast, calibrating only once a month might not be sufficient, especially if the equipment is used frequently or in varying conditions. Relying on calibration only when the equipment fails a test can leave workers exposed to serious hazards if the device is not functioning properly prior to that test. Lastly, considering calibration to be good indefinitely is incorrect, as even properly functioning equipment can drift out of calibration based on environmental factors and usage over time. Thus, regular calibration as per manufacturer guidelines is key to ensuring safety in confined space operations.