Piezoelectric Pressure Transmitter for Dynamic and Transient Measurement

1. Why You Need It

Static sensors cannot capture the millisecond pressure spikes of engine combustion, compressor pulsation or explosive events. This piezoelectric transmitter uses quartz or PZT ceramic elements that generate a charge proportional to the rate of pressure change, delivering a bandwidth from 0.5 Hz to over 200 kHz. It is the instrument of choice for dynamic and transient pressure measurement in engine research, compressor diagnostics and blast testing, where capturing the true pressure waveform matters.

2. Working Principle

A piezoelectric crystal produces an electrical charge when compressed by a pressure change. Because the charge is proportional to the applied force, the sensor responds to rapidly changing pressure and follows transients up to hundreds of kilohertz. The charge is amplified and converted to a 4-20 mA or voltage signal for data acquisition. Unlike strain-gauge sensors, the piezoelectric element does not require external excitation for its sensing effect, giving it exceptional high-frequency response.

3. Key Advantages

• 0.5 Hz to 200+ kHz bandwidth
• Quartz and PZT ceramic options
• Captures dynamic and transient pressure
• Range 0-1 kPa to 10 MPa
• 4-20 mA output
• IP65 / IP68 protection
• 1/4 inch NPT connection
• 9-32 V DC power
• Ideal for engine and blast testing
• High-frequency response

Common Pain Points & Solutions

Application Cases

Technical Specifications

FAQ

Q: What is a piezoelectric pressure transmitter?

A piezoelectric pressure transmitter uses a piezoelectric crystal that generates an electrical charge when stressed by a pressure change. The charge is proportional to the rate of pressure change, making the sensor ideal for measuring dynamic and transient pressures rather than slowly varying or static values. It is the standard technology for high-frequency pressure measurement in research and testing.

Q: What is the frequency bandwidth?

The bandwidth is 0.5 Hz to over 200 kHz, so the sensor can follow extremely fast pressure changes such as combustion events, compressor pulsation and blast waves that slower sensors would miss or smooth over. This wide bandwidth allows accurate capture of the full pressure waveform, including sharp peaks and rapid oscillations.

Q: Can it measure static pressure?

Piezoelectric sensors respond to changing pressure, so they are best suited to dynamic and transient measurement. For steady or slowly varying static pressure, a strain-gauge, resonant or capacitive transducer is more appropriate. In practice, piezoelectric transmitters are used where the dynamic pressure signature — not the static level — is the quantity of interest.

Q: What sensing elements are used?

Both quartz and PZT (lead zirconate titanate) ceramic elements are available. Quartz offers excellent long-term stability and temperature behavior, making it ideal for precise research. PZT provides higher sensitivity and is often preferred where a stronger signal is needed. The choice depends on the required sensitivity, temperature range and stability.

Q: What is the measurement range?

The measurement range spans 0-1 kPa to 10 MPa, covering dynamic measurement from low-amplitude pulsations to high-pressure transients. The specific range is configured for the application — for example, engine cylinder pressures typically use the higher end, while compressor pulsation monitoring uses the lower end.

Q: What output does it provide?

It provides a 4-20 mA two-wire output, which connects to data acquisition systems, oscilloscopes and control systems for recording and analysis. The signal preserves the high-frequency content of the pressure waveform, allowing engineers to reconstruct the dynamic pressure profile accurately.

Q: How is it installed?

The transmitter is installed via a 1/4 inch NPT process connection, with the electrical connection via an M12 connector. For high-frequency measurement, the sensor should be mounted as close as possible to the pressure source to avoid acoustic damping in the connecting line. Proper torque and mounting minimize resonances that could distort the measurement.

Q: Why is piezoelectric technology used for dynamic measurement?

Piezoelectric crystals generate a charge directly in response to applied force, with essentially no mechanical inertia. This gives them an extremely fast response and wide bandwidth that strain-gauge and capacitive sensors cannot match. For capturing combustion events, shock waves and pulsations, piezoelectric is the only technology with the required speed and bandwidth.

Q: Is it rugged enough for blast testing?

Yes. The piezoelectric sensing element is solid-state with no fragile moving parts, and the transmitter housing is IP65/IP68 rated. This rugged construction withstands the high-energy, high-frequency pressure events of blast and detonation testing, where fragile sensors would be destroyed.

Q: Where is it used?

It is used in automotive engine combustion research, compressor pulsation diagnostics, aerospace shock and blast testing, and detonation studies. Anywhere fast, high-frequency pressure transients must be captured accurately, the piezoelectric pressure transmitter is the instrument of choice.