Nexisense Pressure Sensor: Industrial-Grade High-Precision Pressure Measurement and System Integration Solutions

Core Technical Principles and Industrial-Grade Advantages of Pressure Sensors

Pressure sensors convert the measured pressure into a measurable electrical signal for precise perception. The Nexisense series is mainly based on three mature technical routes:

• Ceramic Piezoresistive: Thick-film process prints Wheatstone bridge on ceramic substrate; pressure causes substrate deformation leading to resistance change. Features strong corrosion resistance (direct contact with acid/alkali media), excellent overload capability (2–5×FS), small temperature drift (typical <±0.015% FS/℃).

• MEMS Silicon Piezoresistive: Silicon micromachining forms piezoresistors on silicon diaphragm; pressure causes diaphragm deformation changing resistance. Advantages include small size (chip<3×3 mm), fast response (<1 ms), high batch consistency, and cost-effective production.

• Ceramic Capacitive: Ceramic electrodes + ceramic diaphragm form differential capacitor structure; pressure changes plate spacing leading to capacitance variation. Features excellent long-term stability (annual drift <±0.1% FS), strong electromagnetic interference resistance, and no hysteresis.

  
  

Key Performance Parameters Comparison (Typical Values):

• Range: ±1 kPa ～ 100 MPa

• Accuracy Class: 0.1% FS ～ 0.5% FS

• Overload Capability: 2–5×FS (some models 10×)

• Temperature Compensation Range: -40℃～+125℃

• Output Forms: mV, 0.5–4.5 V, 4–20 mA, I²C, RS485/Modbus RTU

• Protection Rating: IP65～IP68, optional explosion-proof Ex ia IIC T4 Ga / Ex d IIC T6 Gb

Compared with traditional metal strain gauge sensors, Nexisense ceramic and MEMS solutions offer significant advantages in corrosion resistance, fatigue resistance, long-term stability, and miniaturization, especially suitable for long-term online monitoring under harsh conditions.

Main Application Scenarios and Engineering Project Practices

Industrial Process Control and Fluid Systems
Deployed at key nodes in chemical pipelines, pharmaceutical reactors, food & beverage filling lines, etc. 4–20 mA two-wire output directly connects to PLC or DCS for pressure-flow-level composite closed-loop control. In a large ethylene cracking unit project, Nexisense ceramic piezoresistive sensors (0–10 MPa, 0.25% FS) operated continuously for 36 months with zero drift <±0.08%, effectively preventing shutdown accidents due to pressure fluctuations.

Hydraulic and Pneumatic System Monitoring
Used for high-pressure chambers and return lines in construction machinery, injection molding machines, hydraulic test benches, etc. MEMS silicon piezoresistive sensors (0–40 MPa, response<1 ms) support high-speed acquisition, connected via CAN bus to equipment controllers for real-time pressure curve recording and fault prediction. In an automotive transmission test bench project, the sensor array reduced pressure anomaly response time to <5 ms with misjudgment rate <0.3%.

Medical Equipment and Respiratory Therapy
Integrated into ventilator airway pressure monitoring, hemodialysis machine dialysate pressure control, PEEP regulation modules, etc. Ceramic capacitive sensors (±10 kPa, 0.1% FS) resist disinfectant corrosion and support repeated use after sterilization. In an ICU ventilator retrofit project at a tertiary hospital, Nexisense modules controlled airway pressure fluctuations within ±0.15 cmH₂O, significantly reducing patient-ventilator asynchrony incidence.

New Energy Vehicles and Battery Testing
Monitors coolant pressure in battery packs, hydrogen fuel cell gas path pressure, brake system oil pressure, etc. MEMS sensors (0–1.6 MPa, IP67) withstand vibration and thermal shock, with CAN FD output meeting automotive-grade communication requirements. In a power battery test platform project, the sensor array supported 1000 Hz sampling rate, aiding thermal runaway pressure early warning system response time<50 ms.

Selection Guide and System Integration Considerations

Selection Key Parameters

• Range and Accuracy: Process control prioritizes 0.1–0.25% FS high precision, hydraulic systems can use 0.5% FS economical type

• Overload and Withstand Pressure: Critical safety points recommend ≥3×FS overload capability, instantaneous withstand pressure ≥1.5× range

• Output and Communication: Industrial sites prefer 4–20 mA for stability, smart devices prioritize I²C/UART, networking scenarios select RS485/Modbus

• Media Compatibility: Corrosive media select ceramic isolation diaphragm, oil media select 316L + fluororubber seal

• Temperature and Environment: High-temperature conditions select high-temperature compensated type (up to 150℃), humid/dusty environments select IP68 + 316L stainless steel housing

System Integration Considerations

• Installation Location: Avoid strong vibration sources and pulsating flow; recommend adding buffer tubes or dampers; vertical installation reduces condensate influence

• Electrical Protection: 4–20 mA loops recommend three-wire + signal isolator, RS485 bus add 120 Ω terminating resistor and use shielded twisted pair

• Zero and Span Calibration: Factory NIST traceable multi-point calibration; recommend field verification with standard pressure source every 6–12 months

• Temperature Compensation: Use built-in NTC or PT1000 for real-time compensation to avoid >±0.5% error when ambient temperature difference >±30℃

• Explosion-Proof and Safety: Zone 0/1 areas must use Ex ia or Ex d certified models, critical safety loops recommend SIL2/3 design

• Data Fusion: Combine with flow/temperature/level sensors for multi-variable trend modeling, access SCADA or cloud platform for predictive maintenance

OEM Customization and Bulk Supply Advantages

Nexisense provides full-chain OEM/ODM services from chip level to complete transmitters, supporting:

• Custom range, accuracy class, and temperature compensation curves

• Special media isolation diaphragm materials (Hastelloy, tantalum, PTFE, etc.)

• Interface and protocol adaptation (custom Modbus registers, CANopen, Profibus DP)

• Form factor and mounting optimization (M20×1.5, G1/4, sanitary clamp, flange, etc.)

• Brand labeling, serialization management, and traceable supply chain

Bulk supply capability covers tens of thousands to hundreds of thousands of units, delivered in phases according to customer R&D – small batch validation – mass production rhythm, with tiered pricing, strategic stocking, and joint reliability testing. Long-term partners can participate in joint development of next-generation high-frequency response, low-power, or wireless pressure sensors.

Frequently Asked Questions (FAQ)

1. What is the main difference in performance between Nexisense ceramic piezoresistive sensors and diffused silicon sensors in corrosive media?
      Ceramic piezoresistive sensors use full ceramic isolation diaphragm, can directly contact acid/alkali media without filling liquid, offering superior long-term stability and corrosion resistance compared to filling-liquid diffused silicon.

2. How to reduce the impact of pressure pulsation on sensor measurement in hydraulic systems?
      Recommend installing damping screws or buffer tubes at the sensor front end, with damping coefficient adjusted on-site based on pulsation frequency and amplitude, typically controlling pulsation error within ±0.3%.

3. How does the sensor perform in terms of zero drift and lifespan in high-temperature steam environments (150℃)?
      High-temperature compensated ceramic capacitive sensors have annual zero drift

   <±0.12% typical="" lifespan="">8 years, far exceeding ordinary diffused silicon in steam environments.

4. How to achieve unified Modbus address management for multi-point pressure monitoring networks?
      Factory default addresses can be batch-modified via dedicated host software, supporting custom addresses in range 1–247 to avoid conflicts; recommend address segment division (e.g., 1–50, 51–100).

5. How do medical pressure sensors meet sterilization and biocompatibility requirements?
      Provide EO/gamma sterilization compatible versions, diaphragm materials pass ISO 10993 biocompatibility testing, compliant with IEC 60601-1 medical electrical safety specifications.

6. What is the minimum order quantity and lead time for OEM custom special ranges (e.g., ±500 Pa micropressure)?
      Micropressure series starts at 500 units, highly customized diaphragm and compensation curve projects usually start at 2000 units, development cycle 8–14 weeks.

7. How to ensure output stability of the sensor in strong electromagnetic interference environments?
      Internal shielded design + optocoupler isolation + filtering circuit, compliant with IEC 61000-4-3/4-6 Class 3 immunity requirements; recommend on-site installation of surge protectors and shielded grounding.

8. How to avoid ground loop interference in 4–20 mA signals when interfacing with PLC/SCADA systems?
      Recommend using signal isolators (isolation voltage ≥1500 Vrms), or selecting three-wire active output modules to effectively eliminate ground potential differences between devices.

9. Does bulk supply provide per-batch calibration certificates and consistency reports?
      Yes, provides factory multi-point calibration certificates (NIST traceable), batch statistical analysis, and optional third-party retest reports.

10. For new energy battery pack coolant pressure monitoring, what is the recommended sensor selection and installation strategy?
       Recommend 0–600 kPa, 0.25% FS ceramic piezoresistive sensor, G1/4 thread + 316L isolation diaphragm, installed in low-pulsation section of cooling circuit, with buffer tube added; recommend redundant dual-sensor configuration for reliability.

Conclusion

Nexisense focuses on providing high-reliability pressure sensing solutions for system integrators and equipment manufacturers in industrial automation, hydraulic systems, medical equipment, new energy vehicles, and process control fields. If your company requires pressure sensor selection, system integration verification, special media adaptation, or OEM custom development support in process control systems, hydraulic test benches, ventilators, battery thermal management, or smart manufacturing upgrade projects, welcome to contact us for in-depth communication on specific working condition requirements and cooperation paths. Together, we promote industrial pressure measurement toward higher precision, stronger robustness, and lower full lifecycle costs.