Num'axes NGPIEACC021 User Manual

The Num'axes NGPIEACC021 is a precision industrial-grade piezo-electric accelerometer designed for high-frequency vibration measurement and analysis. It features a wide measurement range, integrated signal conditioning, robust IP67-rated housing, TEDS compatibility, a standard coaxial output connector, and operates on a constant current supply. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Piezo-electric sensing element, Stainless Steel housing, Integrated electronics, Coaxial output connector, Mounting stud.

Installation

Unpack and inspect contents. Ensure mounting surface is clean and flat.

1. Prepare Mounting Surface: Clean area with isopropyl alcohol to ensure good mechanical coupling.
2. Mount the Sensor: Screw the integrated M5 stud into a pre-tapped hole on the test structure. Alternatively, use adhesive mounting for temporary setups.
3. Connect the Cable: Attach the coaxial cable to the sensor's output connector and hand-tighten the coupling nut.
4. Route the Cable: Secure the cable along its path using cable ties to prevent strain on the connector.
5. Connect to DAQ System: Plug the other end of the cable into the constant current input channel of your data acquisition system.

WARNING! Over-tightening the mounting stud can damage the sensor or the test structure. Use recommended torque. Ensure all connections are secure.

First-Time Setup

Power on your data acquisition system; configure the input channel.

1. Power Up: Apply the specified constant current excitation (e.g., 4 mA) to the sensor via the DAQ system.
2. TEDS Read (if supported): If your system supports IEEE 1451.4, auto-read the TEDS chip to populate sensitivity, serial number, and calibration date.
3. Manual Configuration: If TEDS is not used, manually enter the sensitivity value (from calibration certificate) into your DAQ software.
4. Verify Signal: Gently tap the sensor. Observe a transient signal on the DAQ monitor to verify proper operation.
5. Set Measurement Parameters: In your software, configure the input range, sampling rate, and required filters based on your application.

CAUTION! Do not apply power outside the specified range. Ensure the sensor is properly grounded through the DAQ system to avoid ground loops.

Specifications

• Model: NGPIEACC021.
• Sensitivity: 100 mV/g (±5%, typical).
• Measurement Range: ±50 g peak.
• Frequency Range: 0.5 Hz to 10 kHz (±3 dB).
• Resonant Frequency: >25 kHz.
• Output Impedance: <100 Ohms.
• Excitation (Constant Current): 2 to 20 mA, 18-30 V DC.
• Output Bias Voltage: 8-12 V DC (with 4 mA excitation).
• Operating Temperature: -40°C to +120°C.
• Housing Material: Stainless Steel.
• Connector: Coaxial, 10-32 UNF.
• Mounting: Integrated M5 stud.
• Weight: Approx. 50 grams.

Controls and Connections

The sensor has no user controls. Operation is managed via the connected Data Acquisition System.

Connections: Single coaxial connector for combined power and signal.

DAQ System Settings: Excitation: Set to specified constant current (e.g., 4 mA). Input Coupling: Typically DC coupling. Input Range: Set according to expected signal level (based on sensitivity and expected g-level). TEDS: Enable if supported for automatic configuration.

Connecting to Data Acquisition Systems

Standard connection to a constant current (IEPE/ICP®) compatible input channel.

1. Ensure the DAQ system and sensor are powered off before making connections.
2. Connect the coaxial cable between the sensor and the DAQ input channel.
3. Power on the DAQ system and enable the constant current supply for the connected channel.
4. Verify the output bias voltage is within the specified range (e.g., 8-12 V DC) to confirm proper connection and power.

Tip: Use low-noise, shielded coaxial cables and keep cable runs as short as possible to minimize noise pickup.

Measurement & Calibration

Designed for accurate vibration measurement across its specified frequency range.

1. Baseline Check: Before critical measurements, perform a baseline check in a known low-vibration state.
2. Data Acquisition: Start recording on your DAQ system. Ensure sampling rate is at least 2.5 times the highest frequency of interest.
3. Unit Conversion: The DAQ software should convert the measured voltage to acceleration (g) using the formula: Acceleration (g) = Measured Voltage (V) / Sensitivity (V/g).
4. Frequency Analysis: Apply FFT or other analysis in post-processing to view vibration spectra.
5. Periodic Re-calibration: For critical measurements, compare against a reference standard annually or as per quality procedures.

WARNING! Do not expose the sensor to acceleration levels beyond its specified range, as this may cause saturation or damage. Avoid dropping or impacting the sensor.

Maintenance & Diagnostics

Regularly inspect the sensor body, mounting stud, and connector for damage or corrosion.

Diagnostic Checks: No Signal: Verify constant current power is applied and bias voltage is correct. High Noise: Check cable and connector for damage; ensure proper grounding. Drifting Output: May indicate moisture ingress or internal fault; contact support.

Care & Storage

Store in the supplied protective case in a clean, dry environment. Before storage, clean the exterior with a soft cloth dampened with isopropyl alcohol. Do not immerse in liquids.

CAUTION! The sensing element is sensitive to static discharge. Handle with care. Avoid storing in areas with extreme temperatures or high humidity.

Regulatory Information

CE Marked: Complies with applicable EU directives for electromagnetic compatibility and safety. RoHS Compliant: Meets Restriction of Hazardous Substances directive. Manufactured under an ISO 9001 certified quality management system. For support, calibration, or technical specifications, visit www.numaxes.com or contact +1 (800) 555-0210.

Troubleshooting

Factory Service/Recalibration: Contact Num'axes support for repair or periodic recalibration.

Support: +1 (800) 555-0210; www.numaxes.com/support