New York Low Pressure Boiler Certificate of Fitness (COF) 2025 – 400 Free Practice Questions to Pass the Exam

A manometer is a device specifically designed to measure the pressure of gases or liquids. It operates based on the principle of balancing a column of liquid (usually water or mercury) against the pressure being measured. When gas or liquid pressure is applied to one side of the manometer, it causes the liquid to rise or fall, providing a direct reading of pressure relative to atmospheric pressure.

In the context of low-pressure boilers, which often utilize gas or steam, a manometer can effectively measure the pressure within the system, ensuring it operates within safe limits. Proper pressure readings are crucial for the efficient and safe functioning of a boiler, making accurate measurements essential for operators.

The other options refer to readings that are not associated with a manometer: temperature is measured with thermometers, water levels with level gauges, and electrical resistance with ohmmeters. Thus, the primary function of a manometer distinctly aligns with providing pressure readings for gas flows.