Sensor & Product Development

Non-Wetted Piezoelectric Vortex Sensor

Velomac developed a vortex sensing structure that keeps the piezoelectric element outside direct process-medium contact while preserving the mechanical signal path used to detect vortex shedding.

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Comparison of traditional and Velomac non-wetted vortex sensor signals — Non-wetted sensor development and controlled waveform comparison.

Signal retained

>95%

Process temperature

>400°C

Comparison point

DN50 at 4.2 m/s

Service structure

Removable sensor core

Sensor Structure

What Velomac developed

The design separates the sensing element from the medium without breaking the mechanical transmission path.

Piezoelectric element remains outside direct medium contact
Thin metal diaphragm receives fluid-induced vibration
Tapered rigid coupling transfers the signal to the sensor core
Removable core supports focused field service
Protection-tube length can be configured for process heat

Section view of the removable non-wetted vortex sensor structure — Section view of the removable sensing core and protected transmission path.

Service Direction

Replace the sensor core without removing the complete meter body

The removable core is designed to reduce full-meter disassembly. Any field intervention still follows the approved isolation, pressure and temperature safety procedure.

Meter-body removal

Not required for sensor-core replacement

Operating Relevance

Protection without giving up the vortex signal

Process heat

Test work for the non-wetted direction included operation above 400°C.

Deposits and particles

The sensing element is less directly exposed to medium contamination and impurity buildup.

Maintenance access

Service work can focus on the removable core instead of the complete meter assembly.

Validation Evidence

Same board, same operating point

The traditional medium-contact sensor and the Velomac non-wetted sensor were compared with the same signal-processing board.

Waveform from the traditional medium-contact vortex sensor — Traditional medium-contact sensor waveform.

Waveform from the Velomac non-wetted vortex sensor — Velomac non-wetted sensor waveform.

Controlled Test Point

Controlled comparison data

The result applies to this operating point and should not be read as a full-range accuracy statement.

Signal result

>95% amplitude retained

Test item	Test value
Ambient temperature	28°C
Atmospheric pressure	101.413 kPa
Meter size	DN50
Flow velocity	4.2 m/s
Signal processing	Identical board for both sensors
Measured result	More than 95% of the traditional signal amplitude retained

Suitable Process Conditions

Where this direction may be relevant

Application review still starts with the medium, heat, pressure, flow and maintenance procedure.

High-temperature steam and thermal process lines
Media where deposits or particles may reach the sensing area
Continuous lines where full meter removal creates substantial service work
Installations requiring a defined sensor-core replacement procedure
Sites where vibration and pipe stress must also be reviewed

Related Developments

Explore adjacent sensing and test work

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Adaptive filtering and wide flow coverage for pipelines affected by changing load and vibration.

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Testing & Calibration Systems

Vibration Measurement Test System

Applies controlled airflow and mechanical vibration while recording the meter response.

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Vortex flowmeter installed on a chemical or pharmaceutical process utility line

Application Upgrade Projects

Smart Vortex Upgrade for Chemical and Pharmaceutical Processes

Reviews when a vortex meter can replace an orifice plate in chemical and pharmaceutical utility lines.

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Selection support

Discuss the medium, temperature and maintenance condition.

Share the process medium, pressure, temperature, pipe size, flow range and permitted service procedure.

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