Which device is used to measure pressure?

Which device is used to measure pressure?

• A. Thermocouple
• B. RTD
• C. Pressure transducer
• D. Orifice plate

Answer: (C)

Measuring pressure requires a device that responds to pressure with a change that can be read by instrumentation. A pressure transducer does this by using a sensing element that deflects or strains under pressure and a transduction mechanism (such as strain gauges, capacitance, or piezoresistive elements) to convert that mechanical deformation into an electrical signal proportional to the pressure. That signal can then be conditioned and read by controllers or display instruments. The other options don’t measure pressure directly: a thermocouple and an RTD are temperature sensors, not pressure sensors. An orifice plate creates a pressure drop to infer flow rate, but it is not itself a sensor that measures pressure.

Measuring pressure requires a device that responds to pressure with a change that can be read by instrumentation. A pressure transducer does this by using a sensing element that deflects or strains under pressure and a transduction mechanism (such as strain gauges, capacitance, or piezoresistive elements) to convert that mechanical deformation into an electrical signal proportional to the pressure. That signal can then be conditioned and read by controllers or display instruments.

The other options don’t measure pressure directly: a thermocouple and an RTD are temperature sensors, not pressure sensors. An orifice plate creates a pressure drop to infer flow rate, but it is not itself a sensor that measures pressure.