Which component is NOT part of a rotameter?

• A. Knob
• B. Flow tube
• C. Gas filter
• D. Indicator float

Answer: (C)

A rotameter is a device used to measure the flow rate of gases or liquids in a closed tube. It typically features a tapered flow tube, inside which an indicator float moves up and down in response to the flow rate. The flow tube is calibrated to allow for accurate measurement, and the indicator float provides a visual representation of the flow rate.

The component that is not part of a rotameter is a gas filter. While filters are essential in various gas delivery systems to remove contaminants or particulate matter, they are not integral to the functioning of a rotameter itself. The primary components that define a rotameter's design and operation include the flow tube, the indicator float, and a knob often used to adjust the flow rate. These components work together to enable accurate measurement, whereas a gas filter serves a different purpose and does not contribute to the measurement process of flow rate.