Which device is typically used to indicate the operation of pumps or valves in plumbing systems?

Which device is typically used to indicate the operation of pumps or valves in plumbing systems?

• A. Pressure gauge
• B. Flow meter
• C. Flow switches
• D. Thermometer

Answer: (C)

When you need a simple on/off indication that a pump or valve is actually moving fluid, you use a sensor built to detect flow. A flow switch sits in the piping and senses when fluid is moving. When flow is present, it changes state and sends a signal to the control system, clearly indicating that the pump is operating or a valve has opened. This kind of device is ideal for interlocks, alarms, and sequencing because it provides a clear status of motion rather than a numeric measurement. A pressure gauge, by contrast, only shows pressure and can suggest activity indirectly, but it doesn’t confirm flow. A flow meter measures how much fluid is passing through, which gives flow rate data rather than a simple operational status. A thermometer measures temperature, which isn’t related to whether pumps or valves are running. Hence, flow switches are the most appropriate choice for indicating operation.

When you need a simple on/off indication that a pump or valve is actually moving fluid, you use a sensor built to detect flow. A flow switch sits in the piping and senses when fluid is moving. When flow is present, it changes state and sends a signal to the control system, clearly indicating that the pump is operating or a valve has opened. This kind of device is ideal for interlocks, alarms, and sequencing because it provides a clear status of motion rather than a numeric measurement.

A pressure gauge, by contrast, only shows pressure and can suggest activity indirectly, but it doesn’t confirm flow. A flow meter measures how much fluid is passing through, which gives flow rate data rather than a simple operational status. A thermometer measures temperature, which isn’t related to whether pumps or valves are running. Hence, flow switches are the most appropriate choice for indicating operation.