YDMKY High-Precision Micro-Pore Water Pressure Gauge

Product Introduction

The YDMKY series high-precision pore water pressure gauge is designed to measure pore water pressure, seepage pressure, and excess pore water pressure in soil, mud, sand, rock, and model piles. It is suitable for static and dynamic measurements, including dynamic centrifuge model tests and geotechnical monitoring for bridge and culvert construction.

Featuring a strain-based full-bridge circuit, the sensor helps compensate for the influence of temperature changes to improve measurement accuracy. Its compact size, lightweight design, waterproof performance, and reusability make it suitable for installation in or around monitored structures. Bottom-outlet and side-outlet configurations are available, and dimensions and measurement ranges can be customized to meet specific project requirements.

Performance Features

•  High measurement accuracy: Specified accuracy of ≤±0.3% full scale (F.S.).

• Temperature compensation: Full-bridge strain circuit helps reduce the influence of temperature changes.

• Static and dynamic monitoring: Suitable for static pore pressure and dynamic pressure measurements.

• Compact structure: Small dimensions and lightweight construction support installation in confined locations.

• Waterproof design: Intended for pore water pressure monitoring in wet and water-exposed environments.

• Customizable measurement range: Ranges can be customized from 0.01 MPa to 10 MPa.

•  Flexible installation: Bottom outlet and side outlet options are available.

• Reusable sensor: Can be reused for multiple suitable monitoring and testing applications.

•  Custom dimensions: The smallest stated customizable diameter is 2.54 mm, subject to the required structure and configuration.

•  Flexible signal options: Depending on the model, outputs include 0.2 mV/kPa, 0–5 V, or 4–20 mA.

Working Principle

The YDMKY pore water pressure gauge uses a strain-based sensing principle. When pore water pressure acts on the sensing element, the resulting deformation changes the electrical output of the strain measurement circuit. This signal is used to determine the applied pressure.

The full-bridge circuit helps compensate for temperature-related effects, supporting stable measurements under changing environmental conditions. Depending on the selected model, the sensor output can be connected to a static strain collector or to voltage/current acquisition equipment for data recording and monitoring.

Technical Parameters

Dimensions and Configuration Reference

The supplied specification contains three columns of dimension and configuration data, but the original table formatting does not clearly identify all model-to-value relationships.

Technical note: Confirm the diameter and height corresponding to each model, the meaning of “polysilicon” in the sensing-principle row, the resolution specifications, and the rated water-pressure resistance with the manufacturer before publishing a model-specific datasheet.

Application Scenarios

• Bridge construction: Monitor pore water pressure in soil and foundation materials during construction.

•  Culvert construction: Support geotechnical monitoring around culverts and associated earthworks.

•  Soil and foundation engineering: Measure pore pressure changes in soil, mud, and sand.

•  Rock engineering: Monitor static and excess pore water pressure in rock and soil structures.

• Model pile testing: Measure pore pressure around model piles during laboratory or engineering tests.

• Dynamic centrifuge testing: Measure pore water pressure in dynamic geotechnical centrifuge model tests.

• Geotechnical research laboratories: Support static and dynamic pore pressure experiments.

• Water seepage monitoring: Observe pressure changes within monitored structures and surrounding materials.

YDMKY vs. General Pore Water Pressure Sensors

Frequently Asked Questions

Q1: What does the YDMKY pore water pressure gauge measure?

It measures pore water pressure, seepage pressure, and static or excess pore water pressure in soil, mud, sand, rock, and model piles.

Q2: Is it suitable for bridge and culvert construction?

Yes. It is suitable for geotechnical monitoring associated with bridge and culvert construction, including pore pressure measurements in surrounding soil and foundation materials.

Q3: What measurement ranges are available?

The measurement range can be customized within 0.01–10 MPa. The appropriate range should be selected according to expected pressure conditions at the monitoring site.

Q4: What is the specified measurement accuracy?

The stated accuracy is ≤±0.3% F.S., where F.S. means full scale.

Q5: Can the sensor measure dynamic pore water pressure?

Yes. The series is specified for both static and dynamic measurements, including dynamic centrifuge model tests.

Q6: How does the instrument address temperature changes?

It uses a full-bridge strain circuit designed to help compensate for the influence of temperature changes on measurement results.

Q7: What output signals are available?

Listed outputs include 0.2 mV/kPa, 0–5 V, and 4–20 mA. The available output depends on the selected configuration.

Q8: Can the dimensions be customized for confined installation spaces?

Yes. The dimensions and structure can be customized. The manufacturer states that the smallest customizable diameter is 2.54 mm; confirm feasibility for the required range and installation conditions.

Q9: What equipment is needed to collect the measurement data?

Depending on the selected output, supporting equipment may include a static strain collector, cable, transmitter, or voltage/current acquisition equipment.