Monocrystalline Silicon Pressure Transmitter with 0.05% FS Accuracy

1. Why You Need a Monocrystalline Silicon Transmitter

When a process loop demands laboratory-grade accuracy — custody transfer, precision dosing, critical reactor pressure — a standard sensor's drift and non-linearity become unacceptable. A monocrystalline silicon pressure transmitter addresses this with a single-crystal silicon diaphragm, the same material used in high-end semiconductor sensing, which offers exceptional repeatability, low hysteresis and minimal long-term drift. The result is measurement you can trust at 0.05% FS, with a Wheatstone bridge formed directly on the silicon chip, making it the choice for applications where small pressure errors translate into large costs.

2. Working Principle of the Monocrystalline Silicon Transmitter

The core is a single-crystal silicon diaphragm onto which a Wheatstone bridge is formed using microelectronic technology. Process pressure is transmitted to the silicon chip through an isolation diaphragm and filling fluid; the resulting deformation of the chip changes the bridge resistance, producing a voltage signal proportional to pressure. This signal is then amplified, compensated and linearized to output a standard 4-20 mA signal. The monocrystalline structure minimizes creep and hysteresis, while built-in temperature compensation keeps accuracy stable across the -40 °C to +120 °C range.

3. Monocrystalline Silicon Design Advantages

• Ultra-high accuracy: 0.05% FS with linearity, hysteresis and repeatability included.
• Exceptional stability: ±0.1% drift over 3 years for dependable long-term measurement.
• Low static pressure effect: ±0.05% / 10 MPa minimizes errors under high static pressure.
• Minimal power supply effect: ±0.001% / 10 V, negligible supply-induced drift.
• Harsh environment ready: explosion-proof certification and wide temperature range.

Common Measurement Challenges & Solutions

Why Choose Our Monocrystalline Silicon Pressure Transmitter?

• 0.05% FS ultra-high accuracy for precision control
• Single-crystal silicon diaphragm with Wheatstone bridge
• ±0.1% stability over 3 years
• ±0.05% / 10 MPa low static pressure effect
• ±0.001% / 10 V negligible power supply effect
• 4-20 mA output with LCD display
• Explosion-proof certification for hazardous areas
• Measures gas, steam and liquid media
• Wide -40 °C to +120 °C medium temperature range
• 15-36 V DC wide power supply

Q: What is a monocrystalline silicon pressure transmitter?

A monocrystalline silicon pressure transmitter uses a single-crystal silicon diaphragm as its sensing element. A Wheatstone bridge is formed directly on the silicon chip through microelectronic processing. When process pressure deforms the chip, the bridge resistance changes, producing a voltage proportional to pressure. This technology offers exceptional accuracy, low hysteresis and minimal long-term drift compared to polycrystalline or bonded-strain sensors, making it the preferred choice for high-precision industrial pressure measurement.

Q: Why is monocrystalline silicon more accurate?

Single-crystal silicon has a perfectly ordered atomic structure with no grain boundaries, which gives it excellent elastic repeatability and very low hysteresis and creep. When a Wheatstone bridge is fabricated directly on the silicon, the sensing elements are intrinsically matched and thermally coupled, improving linearity and temperature behavior. These properties allow monocrystalline silicon transmitters to achieve accuracies down to 0.05% FS, far better than conventional metal-strain or polycrystalline silicon sensors.

Q: What does 0.05% FS accuracy mean?

0.05% FS means the measurement error is within 0.05% of the full-scale (upper range limit) value, and this figure includes linearity, hysteresis and repeatability across the range. For example, on a 10 MPa transmitter, 0.05% FS corresponds to about 5 kPa of error. This is a laboratory-grade accuracy level suitable for custody transfer, precision dosing and critical control loops where even small pressure errors are costly.

Q: How does static pressure affect the measurement?

Static pressure — the line pressure present at the sensor regardless of the measured pressure — can shift a transmitter's zero and span. This transmitter specifies a low static pressure effect of ±0.05% per 10 MPa, meaning the reading stays accurate even under high line pressure. This is important in high-pressure pipelines and vessels where the working pressure is superimposed on a large static pressure, and it distinguishes high-quality transmitters from ordinary ones.

Q: What is the long-term stability?

The transmitter offers long-term stability of ±0.1% over 3 years, meaning its calibration remains valid for an extended period with minimal drift. This reduces the frequency of recalibration and gives confidence that the measurement stays accurate between service intervals. Combined with the low static pressure and power supply effects, this stability makes the instrument well suited to critical and remote installations.

Q: What media can it measure?

The transmitter is designed for gas, steam and liquid measurement. The process pressure is transmitted to the silicon chip through an isolation diaphragm and filling fluid, which protects the sensing element from direct contact with the medium. This allows the instrument to measure a wide range of process fluids, including hot steam and liquids, across a medium temperature range of -40 °C to +120 °C.

Q: Is it suitable for hazardous areas?

Yes. The transmitter carries explosion-proof certification, making it suitable for installation in hazardous areas where flammable gases or vapors may be present. The certified housing and intrinsically safe power supply option (10.5-26 V DC) allow it to be used in classified zones in petrochemical, oil and gas, and chemical plants, in accordance with local electrical codes for hazardous-area wiring.

Q: What power supply does it require?

The transmitter operates on a 15-36 V DC power supply, with an intrinsically safe version rated for 10.5-26 V DC for hazardous-area use. The power supply effect is negligible at ±0.001% per 10 V, so variations in supply voltage do not measurably affect the output. The wide input range provides flexibility across different control panel and field power configurations.

Q: Does it have a local display?

Yes, the transmitter features an LCD display for local readout of the measured pressure, useful for commissioning, verification and on-site troubleshooting. The display module operates over a -20 °C to +70 °C range. The local display complements the 4-20 mA output, allowing operators to confirm readings at the instrument without needing a separate indicator or a control-room view.

Q: Where are monocrystalline silicon transmitters used?

They are used wherever high-precision, stable pressure measurement is required: custody transfer and metering stations, precision chemical reactor control, power plant steam and feedwater pressure, oil and gas wellhead monitoring, and any critical control loop. Their combination of 0.05% FS accuracy, low drift and explosion-proof certification makes them the standard for applications where measurement quality directly affects cost, safety or product yield.