YDMKY Miniature Pore Water Pressure Gauge

Product Introduction

The YDMKY Miniature Pore Water Pressure Gauge is a compact strain-type pressure sensor designed to measure pore water pressure, also known as seepage or osmotic water pressure, in soil, mud, sand, rock-soil materials, and model piles. It is suitable for geotechnical model tests, laboratory soil experiments, and dynamic centrifuge model tests requiring measurement of both static and dynamic pore water pressure.

The DMKY series features a strain-gauge full-bridge circuit designed to reduce the influence of temperature variations on measurement. Its compact size, lightweight construction, waterproof design, and reusable structure make it suitable for installation in confined experimental spaces and within model materials. The sensor can be customized in dimensions, pressure range, and structural configuration to meet specific experimental requirements.

Available outlet configurations include bottom outlet and side outlet. Selected models provide high-sensitivity output, with a stated resolution of up to 0.005 kPa under the applicable configuration.

Performance Features

1. Miniature structure: Compact dimensions support installation in small-scale geotechnical models and restricted spaces.

2. Static and dynamic measurement: Designed for monitoring pore water pressure under static and changing pressure conditions.

3. Strain-gauge full-bridge design: Converts sensing diaphragm deformation into an electrical signal corresponding to applied water pressure.

4.Temperature-effect compensation: The full-bridge circuit helps reduce measurement errors caused by temperature changes.

5.  High-resolution measurement: A resolution of 0.005 kPa is specified; actual performance depends on the selected model and signal-conditioning configuration.

6. Customizable pressure range: The range can be configured according to experimental requirements, with the source describing custom ranges from low-pressure applications up to 10 MPa.

7. Multiple output options: Depending on model, outputs include a strain-gauge signal or conditioned voltage/current signals.

8. Waterproof construction: Designed for use in wet environments and pore-pressure monitoring applications.

9. Flexible installation: Bottom-outlet and side-outlet configurations are available.

10. Custom dimensions and structure: Diameter, height, range, and sensor shape can be tailored to the experimental setup.

11.  Compatible data acquisition: Can be used with the DMYB series dynamic and static strain acquisition instrument, subject to signal compatibility.

12. Reusable sensor design: Suitable for repeated testing when correctly installed, maintained, and operated within its specified limits.

 Working Principle and Structure

The DMKY series pore water pressure gauge operates using a strain-gauge full-bridge measurement principle. Its sensing assembly includes a permeable stone, sensing diaphragm, strain gauge, and observation cable.

When pore water pressure acts on the sensor's permeable interface, the pressure is transferred to the sensing diaphragm, causing a small deformation. The strain gauge bonded to the sensing element detects this deformation and converts it into an electrical signal. The full-bridge circuit collects the strain variation, which can then be converted into a corresponding pore water pressure value through calibration and signal processing.

For selected miniature models, an internal amplification chip increases signal sensitivity. The manufacturer specifies a resolution of up to 0.005 kPa for the applicable configuration. The pressure range can be customized to suit different soil, rock-soil, and model-test conditions.

Technical Parameters

1. Main Specifications

2 .Dimensions and Model Variations

The supplied specifications list three miniature size configurations. The exact correspondence between each dimension, sensing principle, and output type should be confirmed with the manufacturer.

Note: The original specification does not clearly map every value to a formal model number. Confirm the dimensions, sensing technology, and output signal for the selected configuration before ordering.

3 .Electrical and Performance Specifications

Application Scenarios

The YDMKY miniature pore water pressure gauge is suitable for research and testing applications where accurate pore-pressure monitoring is required in confined or model-scale environments.

• Geotechnical model tests: Monitoring pore water pressure within soil and sand models.

• Dynamic centrifuge model tests: Measuring pore pressure changes during dynamic loading experiments.

• Soil mechanics research: Studying pore pressure response in soil and mud under different loading conditions.

•   Rock-soil experiments: Monitoring pore pressure within suitable rock-soil test specimens.

•   Model pile testing: Measuring pore water pressure in or around model piles.

• Seepage and permeability research: Monitoring pressure changes associated with water movement through porous materials.

• Laboratory civil engineering research: Collecting pressure data for geotechnical analysis and experimental validation.

• Small-scale physical models: Using miniature sensor dimensions where installation space is limited.

YDMKY vs. Conventional Pore Water Pressure Sensors

Frequently Asked Questions (FAQ)

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

It measures pore water pressure in soil, mud, sand, rock-soil materials, and model-test structures. It is intended for both static and dynamic pore-pressure monitoring.

Q2: Is the DMKY series suitable for geotechnical model tests?

Yes. Its miniature dimensions and customizable structure make it suitable for geotechnical laboratory models, model pile tests, and dynamic centrifuge model experiments.

Q3: What pressure ranges are available?

The supplied specifications describe customization from low-pressure applications up to 10 MPa. They also mention a 0–10 kPa low-range configuration with an amplification chip. Confirm the available range for the specific model.

Q4: What is the accuracy of the sensor?

The stated accuracy is ≤0.3% F.S., where F.S. means full scale. The selected pressure range and calibration conditions should be considered when evaluating measurement uncertainty.

Q5: What is the resolution of the YDMKY pressure gauge?

The manufacturer lists a resolution of up to 0.005 kPa. Confirm whether this value applies to the selected model and whether additional amplification or signal conditioning is required.

Q6: Which output signals are available?

The supplied data lists 0.2 mV/kPa for one configuration and 0–5 V or 4–20 mA for other configurations. Output type depends on the selected model.

Q7: Can the sensor be customized for a very small installation space?

Yes. The manufacturer describes customizable dimensions and structure, with a minimum custom diameter of 2.54 mm. Confirm the achievable dimensions and corresponding performance before specifying the sensor.

Q8: Can the sensor be connected to a data acquisition system?

The specified compatible equipment is the DMYB series dynamic and static strain acquisition instrument. For other systems, confirm signal type, excitation requirements, wiring, and interface compatibility.

Q9: Does the sensor have waterproof performance?

The product is described as waterproof and intended for pore-pressure monitoring. The allowable water pressure, immersion conditions, sealing specifications, and cable protection rating should be confirmed for the intended test environment.