With a constriction type, differential head...

🔍 Key Concepts

• Constriction type differential head flow meter – how it creates a pressure drop to infer flow rate • Difference between primary element (flow element) and secondary/transmitting/indicating devices in a measuring system • Common examples of flow-restricting elements used to generate differential pressure

💭 Think About

• Ask yourself: which option actually sits IN the pipe and creates the pressure drop needed for this type of flow meter to work? • Which choices look more like instruments that MEASURE or TRANSMIT a pressure difference, instead of physically causing it? • For each choice, decide: does this device generate the differential pressure, or does it sense/display/transmit it?

✅ Before You Answer

• Verify which device is installed directly in the flow line as a restriction or constriction to create ΔP (pressure drop). • Eliminate any options that mainly serve as indicators, transmitters, or pressure sensors, not as the flow‑restricting element. • Confirm that the correct choice is the one commonly called the primary element or flow element in a differential pressure flow system.

With a constriction type, differential head flow meter, which of the following would be an example of a primary device?

Pneumatic or electronic transmitter

Diaphragm or bellows meter

Mercury manometer

Orifice plate or venturi tube

🔍 Key Concepts

💭 Think About

✅ Before You Answer