MEMS Piezoresistive Pressure Transducer for Fast, Sensitive Measurement
1. Why You Need It
Hydraulic control, gas metering and fast process loops need pressure sensors that respond in milliseconds with high sensitivity across a wide span. This MEMS piezoresistive transducer uses a silicon Wheatstone bridge that converts pressure into a precise resistance change, delivering 1 ms response and a series range from 0.1 kPa to 700 MPa. It gives engineers a compact, low-power, cost-effective sensor that keeps up with rapid pressure changes that slower or less sensitive devices miss.
2. Working Principle
Pressure deflects a silicon diaphragm on which piezoresistive strain gauges are diffused, forming a Wheatstone bridge. As the diaphragm bends, the gauge resistance changes, unbalancing the bridge and producing a voltage proportional to pressure. This voltage is conditioned into standard outputs — 4-20 mA, 0-5 V, 0-10 V or RS485. The MEMS silicon construction provides high sensitivity, small size and a fast 1 ms response, ideal for dynamic and precision applications.
3. Key Advantages
- MEMS silicon Wheatstone bridge sensor
- 1 ms fast response
- High sensitivity
- Series range 0.1 kPa to 700 MPa
- ±0.25% FS accuracy
- 4-20 mA / 0-5 V / 0-10 V / RS485
- -20 to 120 °C operating range
- M12 electrical connection
- Compact, low-power design
- Suitable for gas and liquid media
Common Pain Points & Solutions
| Problem | Conventional Issue | Our Solution | Result |
|---|
| Fast pressure changes missed | Slow sensors lag the process | 1 ms MEMS response | Captures rapid transients |
| Low-pressure sensitivity needed | Insensitive sensors | High-sensitivity silicon bridge | Accurate low-range reading |
| Multiple outputs required | Single-output limits integration | 4-20mA / V / RS485 options | Fits any control system |
| Space-constrained installation | Bulky sensors won't fit | Compact MEMS package | Easy tight-space mounting |
Application Cases
Industry: Hydraulics
Application: Hydraulic system pressure control
Medium: Hydraulic oil
Pressure Range: 0-30 MPa
Operating Temperature: 10-80 °C
Installation Environment: Machine / hydraulic unit
Customer Challenge: Fast feedback for control loop
Previous Problem: Slow sensor caused instability
Solution: 1 ms MEMS transducer, 4-20 mA
Installation Location: Hydraulic manifold
Result: Fast, stable control response
Industry: Gas Metering
Application: Natural gas pressure monitoring
Medium: Natural gas
Pressure Range: 0-0.6 MPa
Operating Temperature: -20 to 60 °C
Installation Environment: Metering station
Customer Challenge: Accurate pressure for flow correction
Previous Problem: Insufficient low-range sensitivity
Solution: High-sensitivity transducer, RS485
Installation Location: Gas meter run
Result: Accurate flow pressure data
Industry: Process
Application: Reactor pressure monitoring
Medium: Process liquid
Pressure Range: 0-1.0 MPa
Operating Temperature: 10-120 °C
Installation Environment: Process area
Customer Challenge: Stable pressure for control
Previous Problem: Sensor drift and lag
Solution: MEMS transducer, 4-20 mA
Installation Location: Reactor vessel
Result: Stable, responsive control signal
Industry: Test Bench
Application: Pressure profiling / data acquisition
Medium: Gas / liquid
Pressure Range: 0-700 MPa (series)
Operating Temperature: 20-25 °C
Installation Environment: Laboratory
Customer Challenge: Clean high-speed data
Previous Problem: Noisy, slow acquisition
Solution: MEMS transducer, 0-10 V
Installation Location: Test fixture
Result: Clean, fast data acquisition
Technical Specifications
| Specification | Value |
|---|
| Sensor Element | MEMS silicon piezoresistive |
| Measurement Range | 0.1 kPa to 700 MPa (series) |
| Accuracy | ±0.25% FS |
| Response Time | 1 ms |
| Output | 4-20 mA / 0-5 V / 0-10 V / RS485 |
| Power Supply | 5 / 24 V DC (15-30 V DC) |
| Operating Temperature | -20 to 120 °C |
| Electrical Connection | M12 |
FAQ
Q: What is a piezoresistive pressure transducer?
A piezoresistive pressure transducer measures pressure using silicon piezoresistive strain gauges diffused onto a diaphragm, connected as a Wheatstone bridge. When pressure deflects the diaphragm, the gauge resistance changes, unbalancing the bridge and producing an output proportional to pressure. This MEMS-based approach is the foundation of most modern compact pressure sensors, offering high sensitivity and fast response.
Q: What is the measurement range?
The series covers a measurement range from 0.1 kPa to 700 MPa, spanning very low differential and vacuum pressures up to extreme high pressures. Individual models are configured for specific spans within this range — for example, the standard model covers 0-0.1 kPa to 3 MPa. This breadth allows one technology to serve nearly every pressure measurement need.
Q: How fast is the response?
The response time is 1 ms, making the transducer suitable for dynamic pressure monitoring, hydraulic control loops and fast-changing process conditions. The fast response ensures the control system receives current pressure data without lag, which is essential for stable closed-loop control of hydraulics and rapid processes.
Q: What outputs are available?
The transducer offers 4-20 mA, 0-5 V, 0-10 V and RS485 outputs. The 4-20 mA loop is standard for industrial PLC and DCS systems, voltage outputs suit data acquisition systems, and RS485 enables digital communication. This flexibility allows the sensor to connect to almost any control or measurement system.
Q: What is the accuracy?
The accuracy is ±0.25% FS for the standard model. The high-sensitivity silicon bridge design also supports higher-accuracy variants for precision applications. For most hydraulic, gas metering and process control duties, ±0.25% FS provides more than sufficient precision for reliable measurement.
Q: What media can it measure?
It measures gas and liquid media compatible with the wetted materials. Silicon MEMS sensors are widely used on air, water, oil, natural gas and process fluids. For aggressive or corrosive media, the wetted diaphragm material must be verified or a diaphragm-isolated version selected to protect the silicon element.
Q: What is the operating temperature range?
The operating temperature range is -20 to 120 °C, covering most industrial and outdoor applications. Within this range the sensor maintains its accuracy, with temperature compensation applied to the bridge output. For extreme temperatures beyond this range, a remote-seal or special-material design would be required.
Q: Why is a MEMS silicon sensor better than a traditional one?
MEMS silicon sensors are smaller, lighter and more sensitive than traditional bonded-foil strain-gauge sensors. The monolithic silicon structure provides high sensitivity, fast response and excellent repeatability, while batch fabrication keeps cost low. These advantages make MEMS piezoresistive transducers the dominant choice for compact, high-performance pressure measurement.
Q: How is it installed?
The transducer is installed via its process connection (threaded) into the pressure port, with the electrical connection via an M12 connector. It is compact enough for tight-space mounting on hydraulic manifolds, gas meter runs and test fixtures. The wiring is connected to the chosen output — 4-20 mA, voltage or RS485 — and the sensor is ranged for the application.
Q: Where is it used?
It is used in hydraulic systems, natural gas metering, process control, test and measurement, and any application requiring a fast, sensitive, compact pressure sensor. Its wide series range and multiple outputs make it a versatile building block for OEM equipment and industrial measurement systems alike.
