CA280 144-280-000-016 Meggitt Piezoelectric Accelerometer

CA280 144-280-000-016 is a high-sensitivity piezoelectric accelerometer from the Meggitt Vibro-Meter product line, representing the latest generation sensor-only version within the CA280 series. This model utilizes a symmetrical shear mode sensing element with internal case insulation and differential output characteristics, effectively suppressing ground loop interference and ensuring signal quality. Its fully welded AISI 316L stainless steel case provides excellent corrosion resistance and mechanical strength, enabling stable operation within the extreme temperature range of -60°C to +260°C. It has obtained multiple international explosion-proof certifications including ATEX, IECEx, and cCSAus, permitting safe use in potentially explosive gas atmospheres such as Zone 0, 1, and 2.

As the sensor-only version of the CA280 series, the 144-280-000-016 does not include an integral cable. Instead, it is equipped with a high-temperature circular 2-pin connector (7/16"-27UNS-2A), allowing users to flexibly select matching low-noise cable assemblies based on the specific application's temperature requirements, cable length, and installation conditions. This design provides maximum flexibility for system integration, particularly suitable for complex installation scenarios requiring custom cable lengths, special temperature ratings, or routing through confined spaces.

Compared to earlier versions (such as 144-280-000-015), the 016 version represents continuous improvement in hardware and manufacturing processes, incorporating updated production technologies and components while maintaining full compatibility with existing systems. This model is currently the mainstream part number for the CA280 sensor-only version and is widely used in both new projects and spare part replacements for existing systems.

II. Key Features and Benefits

1. Excellent Measurement Performance

• High Sensitivity (100 pC/g) : Capable of accurately capturing微小 vibrations as low as 0.01 g, suitable for precision machinery and structural analysis.

• Wide Frequency Response (0.5 Hz to 6000 Hz) : Covers the vibration frequencies of most rotating machinery while allowing accurate measurement of both low and high-frequency components.

• Low Transverse Sensitivity (≤3%) : Ensures measurement primarily along the sensitive axis, reducing interference from transverse vibrations.

• Low Base Strain Sensitivity (typical 0.8×10⁻³ g/με) : Effectively isolates the influence of mounting surface strain on measurement results, improving measurement accuracy.

2. Rugged Mechanical Design

• Fully Welded AISI 316L Stainless Steel Case: Provides excellent corrosion resistance and mechanical strength with high protection level, suitable for harsh environments such as humidity and corrosive gases.

• Internal Case Insulation: The sensor is electrically floating relative to the case, avoiding ground loops and improving signal integrity.

• Wide Operating Temperature Range (-60°C to +260°C): Can withstand extreme temperatures, suitable for high-temperature turbomachinery and low-temperature environments.

• Shock Resistance (<1000 g): Able to withstand accidental mechanical shocks, ensuring sensor survival in harsh operating conditions.

3. International Explosion-Proof Certifications

• Multiple Certifications including ATEX, IECEx, cCSAus, KGS, EAC: Suitable for potentially explosive atmospheres, including Zone 0, 1, and 2 gas environments.

• Intrinsic Safety Ex ia and Non-Sparking Ex nA: Different protection modes available based on application requirements, ensuring safe operation.

• Certification Covers Sensor Body Only: Users must ensure that selected cables and installation accessories comply with explosion-proof requirements.

4. Flexible Installation and Connection

• ARINC 554 Standard Mounting: Fixed using three M4 screws with a mounting torque of 4 N·m, no need for electrical insulation of the mounting surface.

• Detachable Cable Design: The sensor-only version allows users to select cables of appropriate length and temperature rating based on site conditions, reducing spare parts inventory and increasing system flexibility.

• High-Temperature Connector: 7/16"-27UNS-2A threaded interface, mates with CG505 or similar connectors, ensuring reliable electrical connection capable of withstanding high-temperature environments.

5. No Subsequent Calibration Required

• Factory Dynamic Calibration: Each sensor is calibrated at 120 Hz, 5 g peak, 23°C, with a sensitivity tolerance of ±5%, and comes with a calibration certificate. No periodic calibration is necessary, but periodic verification is recommended based on usage conditions.

6. Compliance with International Standards and Environmental Requirements

• RoHS Compliant: Meets 2011/65/EU directive, satisfying global environmental regulations.

• EMC Compatible: Complies with EN 61000-6-2 and EN 61000-6-4 standards, ensuring stable operation in industrial electromagnetic environments.

  
  

III. Typical Applications

Leveraging its high sensitivity, wide temperature range, explosion-proof characteristics, and flexible connection method, the CA280 144-280-000-016 is primarily used in the following scenarios:

• Rotating Machinery Vibration Monitoring: Such as gas turbines, steam turbines, compressors, fans, pumps, for condition monitoring and fault diagnosis, particularly suitable for complex installations requiring custom cable lengths.

• Aerospace Testing: Engine vibration testing, structural modal analysis, flight vehicle health monitoring, requiring high reliability and high-temperature resistance.

• Petrochemical Industry: Online vibration monitoring in hazardous areas, such as critical equipment in refineries and chemical plants; the sensor-only version allows users to select cables suitable for site explosion-proof requirements.

• Power and Energy: Vibration measurement for generator sets, wind turbines, auxiliary equipment in nuclear power plants; cable length can be flexibly configured based on cabinet distance.

• Laboratory Research: Material mechanical testing, structural dynamics research, high-precision vibration measurement; users can select cables with different characteristics based on test requirements.

• Extreme Environment Monitoring: Long-term vibration monitoring under high/low temperature, high humidity, and corrosive atmospheres; special high-temperature cables can be selected.

• Existing System Maintenance: As an upgrade replacement for the 015 version, used for spare part replacement in existing systems to ensure long-term stable operation.

  
  

IV. Operating Principle and System Integration

1. Operating Principle

The CA280 operates on the piezoelectric shear mode principle: an internal seismic mass applies a shear force to the piezoelectric element under acceleration, generating a charge signal proportional to the acceleration. Due to the differential output and internal insulation, this charge signal manifests as a potential difference between the two pins, effectively suppressing common-mode interference. The sensor case is electrically connected to the mounting surface, but the internal circuit is insulated from the case, therefore no special insulation treatment is required for the mounting surface.

2. Signal Conditioning Requirements

As the CA280 outputs a high-impedance charge signal, it must be connected to an external charge converter (such as Meggitt's IPC70x series signal conditioners) or a monitoring system with a charge input. The charge converter transforms the charge signal into a low-impedance voltage signal and may provide functions like integration and filtering, facilitating subsequent data acquisition and analysis. For the sensor-only version, users must select their own cables; the cable capacitance will be added to the sensor capacitance, affecting the total load. When selecting a charge converter, consider the total capacitance to ensure input range compatibility.

3. System Integration Key Points

• Cable Selection and Fabrication: Must use low-noise, shielded cables with an appropriate temperature rating. Meggitt recommends the K205 type twisted shielded cable (suitable for -60°C to +260°C). Users must fabricate connectors on-site or purchase pre-made cable assemblies. The connector must match the sensor's 7/16"-27UNS-2A interface, and the shield must be properly grounded.

• Grounding and Insulation: System grounding should follow the single-point ground principle to avoid ground loops. The cable shield should be grounded at a single point, preferably at the charge converter end, with the sensor end left floating.

• Installation in Hazardous Areas: When used in hazardous areas, special conditions from the Ex certificates must be followed, including limitations on cable capacitance and inductance, and anti-static measures during installation. The selected cable must meet intrinsic safety parameter requirements, and connector fabrication must ensure explosion-proof integrity.

• Interfacing with Monitoring Systems: Connect the voltage signal from the charge converter to VM600 monitoring systems, data acquisition cards, or PLC analog input modules. Configure range, alarm thresholds, etc., via configuration software.

  
  

V. Version Positioning and Selection Recommendations

1. Positioning within the CA280 Series

The 144-280-000-016 is the latest sensor-only version within the CA280 series, superseding the earlier 015 version. Compared to the 015, the 016 version may feature optimizations in the following areas:

• Improved Manufacturing Processes: Utilizes more advanced manufacturing techniques to improve consistency and reliability.

• Updated Components: Incorporates newer electronic components to ensure long-term supply and stable performance.

• Updated Certifications: Maintains original explosion-proof certifications and may have added new ones (such as KGS, EAC).

• Compatibility: Fully compatible with the 015 version, allowing direct replacement of existing 015 sensors in systems.

2. Comparison with Other Versions

3. Selection Decision Recommendations

• New Project Selection: For new projects with cable length requirements within the standard 3-meter or 6-meter range, consider integral cable versions (116 or 126) to simplify installation and ensure sealing. If non-standard lengths, temperature cables are needed, or to reduce spare parts inventory (separate sensors and cables), choose the 016 version.

• Existing System Spare Parts: If the existing system uses the 015 version, the 016 version is an ideal replacement. Confirm mounting dimensions and electrical interface are identical (typically they are) before ordering. Consult with Meggitt to confirm compatibility.

• Special Temperature Requirements: If the application temperature exceeds the rating of the K205 cable (-60°C to +260°C), the 016 version must be used with special cables having a higher temperature rating (verify connector compatibility).

• Explosion-proof Compliance: When selecting the 016 version, users must ensure that the selected cable and connector assembly meet site explosion-proof requirements. It is recommended to use Meggitt-recommended cables and connectors or certified components.

4. Compatibility Notes with Integral Cable Versions

• Interchangeability: The 016 sensor is identical to the sensor body in the 116/126 versions, differing only in cable configuration. Therefore, if on-site sensor replacement is needed, the 016 version can be used with existing cables (requiring connector re-fabrication or use of adapters).

• Spare Parts Strategy: For users with multiple cable length requirements, stocking 016 sensors and several cable reels may be more economical than stocking multiple integral cable versions. However, consider the process capability for on-site connector fabrication and explosion-proof risks.