Pressure · Comparison

Capacitive vs Piezoresistive

Side by side comparison: how they work, where each fits, and which to choose.

Quick answer: Capacitive sensors excel at low ranges, DP and stability; piezoresistive sensors are compact, robust and cheap, and dominate gauge pressure transmitters and switches.

Capacitive vs Piezoresistive: Comparison Table

Aspect	Capacitive	Piezoresistive
Principle	Diaphragm changes capacitance	Strain changes bridge resistance
Strengths	Low ranges, overpressure tolerance, stability	Small size, high ranges, low cost
Temperature effect	Low	Needs compensation
Common products	DP transmitters	Pressure transmitters, transducers, switches
Ceramic versions	Ceramic capacitive cells, abrasion resistant	Thick film on ceramic

Choose Capacitive when

Low DP, flow and level duty
High overpressure tolerance

Choose Piezoresistive when

Hydraulics, compressors, OEM sensors
High pressure ranges

Key Differences Explained

Both are proven; the transmitter specification matters more than the sensing principle. Ceramic capacitive cells resist abrasion and are popular in water and food.

Piezoresistive silicon chips are protected by an oil filled steel diaphragm in most process transmitters.

Related Glossary Terms

GlossaryCapacitive Pressure SensorA capacitive pressure sensor measures pressure from the change in capacitance as a diaphragm moves…GlossaryPiezoresistive Pressure SensorA piezoresistive pressure sensor uses resistors on a diaphragm whose resistance changes with strain…GlossaryOverpressure LimitOverpressure limit is the highest pressure a sensor can take without damage or loss of its calibration.GlossaryFill FluidFill fluid is the incompressible liquid inside a pressure sensor or diaphragm seal that transmits…

Free Calculators

CalculatorTransmitter Turndown CalculatorFree online calculator with formula and worked example.CalculatorPressure Gauge Accuracy CalculatorFree online calculator with formula and worked example.

Frequently Asked Questions

What is the difference between Capacitive and Piezoresistive?

Capacitive sensors excel at low ranges, DP and stability; piezoresistive sensors are compact, robust and cheap, and dominate gauge pressure transmitters and switches.

Is piezoresistive the same as piezoelectric?

No; piezoelectric sensors only measure changing pressure.

Which is more accurate?

Both reach 0.1 % class or better in good transmitters.

Which survives overpressure better?

Capacitive cells often tolerate higher overpressure relative to range.

Learn more on the blog

Gauge pressure transmitter: working principle and applications

A practical guide on instrumentationblog.in that goes deeper into this topic with field examples.

Read Full Article

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