Num'axes NGPIEACC033 User Manual

The Num'axes NGPIEACC033 is a high-precision industrial-grade piezo-electric accelerometer designed for vibration measurement and condition monitoring applications. It features a wide frequency range, high sensitivity, robust IP67-rated housing, integrated electronics (IEPE), 4-20 mA output, and operates on a 18-30 VDC loop power 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 IEPE electronics, 4-pin M12 connector, Mounting thread.

Installation

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

1. Mount the sensor: Use the provided M8 stud or adhesive pad. Tighten to 10 Nm torque.
2. Route the cable: Use shielded, twisted-pair cable. Avoid running near power lines.
3. Connect the cable: Attach the M12 connector to the sensor. Hand-tighten the locking nut.
4. Connect to power/readout: Wire the cable to a compatible 18-30 VDC power supply with 4-20 mA input.

WARNING! Ensure power is OFF during installation. Do not exceed maximum torque. Protect cable from sharp bends and crushing.

First-Time Setup

Apply power; verify operation with a monitoring system.

1. Power up: Apply 24 VDC to the sensor loop. The output should settle to 4 mA (zero acceleration).
2. Verify signal: Gently tap the mounting surface. The output current should increase proportionally.
3. Configure scaling: In your monitoring system, set the input scaling to 100 mV/g (or as per calibration sheet).
4. Set alarms: Configure high/low vibration alarms based on your application requirements.

CAUTION! Do not apply voltage outside the 18-30 VDC range. Ensure proper grounding to avoid noise.

Specifications

• Model: NGPIEACC033.
• Measurement Range: ±50 g peak.
• Sensitivity: 100 mV/g ±5% (at 100 Hz).
• Non-Linearity: <1% of Full Scale.
• Resonant Frequency: >25 kHz.
• Output Impedance: <100 Ω.
• Bias Voltage: 8-12 VDC (IEPE).
• Current Consumption: 2-10 mA (excluding signal current).
• Weight: 45 grams.
• Compliance: CE, RoHS.

Controls and Settings

The sensor has no user-accessible physical controls. All configuration is done via the connected monitoring system or external shunt calibration.

Via Monitoring System: Configure input type (4-20 mA), scaling factor (mA/g), damping filters, alarm setpoints.

Shunt Calibration: A precision resistor can be switched across the IEPE lines to simulate a known acceleration for system verification.

Factory Settings: Sensitivity and frequency response are factory-set. Refer to the individual calibration certificate.

Connecting Devices

Primary connection is to a data acquisition system, PLC, or vibration monitor with 4-20 mA input and IEPE power capability.

1. Turn off all devices before connecting.
2. Connect Pin 1 (V+/IEPE Power+) and Pin 4 (Signal/4-20 mA+) to your monitor's positive terminal.
3. Connect Pin 2 (V-/IEPE Power-) and Pin 3 (Signal Return) to your monitor's negative/common terminal.
4. Ensure the monitor is configured for a 2-wire 4-20 mA loop-powered device.

Tip: Use shielded cable and ground the shield at the monitor end only to prevent ground loops.

Operation and Measurement

Designed for continuous vibration monitoring on motors, pumps, fans, gearboxes, and compressors.

1. Normal Operation: The sensor outputs a 4-20 mA current linearly proportional to the vibration acceleration (RMS or Peak, as configured).
2. Data Interpretation: 4 mA = 0 g, 20 mA = Full Scale (e.g., 50 g). Calculate acceleration: g = (Current - 4 mA) * (Full-Scale g / 16 mA).
3. Trending: Monitor the 4-20 mA signal over time to establish baseline vibration and detect increasing trends.
4. Alarm Action: If the configured alarm setpoint is exceeded, the connected system should trigger an alert or shutdown sequence.

WARNING! Do not subject the sensor to impacts exceeding ±500 g. This may cause permanent damage.

Calibration & Maintenance

Periodic verification is recommended. The sensor itself is not field-calibratable.

Verification: Perform shunt calibration (if supported by your system) or compare readings against a portable calibrator/reference sensor annually.

Re-calibration: Return to an authorized Num'axes service center every 24 months for traceable calibration. Refer to the calibration certificate for due date.

Care & Cleaning

Disconnect power before cleaning. Wipe the housing with a soft, dry cloth. For stubborn dirt, use a cloth dampened with isopropyl alcohol. Do not immerse the connector.

CAUTION! Do not use abrasive cleaners, solvents (except isopropyl alcohol), or high-pressure water jets. Ensure the sensor is completely dry before re-applying power.

Regulatory Information

CE Mark: Complies with EU EMC Directive 2014/30/EU and RoHS Directive 2011/65/EU. This is a Class A device. In a domestic environment, it may cause radio interference. Copyright © 2025 Num'axes Instruments SA. All trademarks are the property of their respective owners. For technical support, visit www.numaxes-support.com or contact +41 22 123 4567.

Troubleshooting

Reset: Cycle power. If problem persists, replace sensor.

Service: +41 22 123 4567; www.numaxes-support.com