What is required for the maintenance of automatic samplers?

The correct option regarding the maintenance of automatic samplers is related to the mechanical and electronic scale. This is important because automatic samplers utilize precise measurements to collect samples accurately. To ensure that these samplers function correctly, it is crucial to maintain both their mechanical and electronic components to guarantee that they are calibrated properly and can measure sample volumes accurately.

A malfunctioning scale could lead to incorrect sampling, potentially affecting data quality and the conclusions drawn from the wastewater analysis. Regular checks and calibrations of these components are necessary to keep the equipment in optimal working condition, thus ensuring reliable sample collection over time.

While manual inspection and other maintenance practices also play a role in keeping automatic samplers functional, focusing specifically on the mechanical and electronic aspects addresses the core needs for accurate sampling and operational reliability.