During filling by volume using a fixed maximum liquid level gauge, who determines when the maximum permitted filling limit for a cylinder is reached?

• A. Automatic Timer
• B. Operator
• C. External Supervisor
• D. Customer

Answer: (B)

During this filling method, the person doing the filling—the operator—holds the responsibility for stopping at the correct level. The fixed maximum liquid level gauge provides a visual cue indicating the maximum allowable liquid level, but it’s the operator who monitors the gauge and closes the valve when that limit is reached. This keeps the cylinder within safe volume limits and prevents overfill.

The other options don’t fit because the gauge requires a human reading and action in this process, rather than an automatic timer or an external supervisor or the customer deciding when to stop. The operator must interpret the gauge and determine when to stop filling.