Product Overview

The EPRO PR9268/301-100 belongs to the PR9268 series of seismic velocity transducers. It converts mechanical casing vibration into an electrical voltage signal. This model is specifically designed for horizontal measuring direction applications. The robust construction includes a splash-proof IP55 rated housing.

Common applications for the PR9268/301-100 include steam turbines, gas turbines, compressors, and large fans. It monitors absolute bearing housing or casing vibration on rotating machinery. The device works seamlessly with EPRO and Emerson monitoring systems.

Technical Specifications

The EPRO PR9268/301-100 offers a sensitivity rating of 28.5 mV/(mm/s) ±5% . This nominal value holds at 20°C with 80 Hz frequency and 100 kΩ load. The frequency response range is 4 Hz to 1000 Hz for comprehensive vibration monitoring.

Key Measurement Parameters

• Vibration amplitude at nominal position: 3000 µm peak-peak

• Limit stops protection: 4000 µm peak-peak

• Permissible acceleration in measuring direction: 10 g peak-peak continuous, 20 g peak-peak short-time

• Permissible acceleration in transverse direction: 2 g peak-peak

• Linearity error of sensitivity: <2%

Dynamic Characteristics

The PR9268/301-100 has a natural frequency of 4.5 Hz ±0.75 Hz at 20°C with 100 kΩ load. The damping factor is 0.56 at 20°C with the same load. At 100°C, the damping factor changes to 0.42. Transverse sensitivity is 0.27 at 110 Hz for this horizontal mounting version.

Electrical Properties

• Resistance measuring circuit: 1875 Ω ±10% (resistive load)

• Insulation resistance: >1 MΩ (test voltage 500 V AC)

• Inductance: <90 mH

• Capacity against housing inclusive cable: <1.2 nF

Environmental and Installation Data

The EPRO PR9268/301-100 withstands extreme environmental conditions. Operating temperature range is -20°C to +100°C for the transducer. Short time exposure under 4 hours is acceptable up to 120°C. Storage and transport temperature ranges from -40°C to +100°C without packing.

The transducer carries an IP55 protection class rating for splash-proof operation. Its housing material is Al Mg Si Pb F28. The device includes an oil-proof PTFE covered metal protection hose. This sensor is also suitable for use in radioactive environments (RAD version).

Installation Guidelines

When planning your measurement with the PR9268/301-100, follow these important guidelines:

• Consider environmental conditions like temperature, humidity, and aggressive substances

• Always use a stiff and vibration-free sensor holder

• Define a suitable measuring range not larger than necessary

• Ensure EMC-compatible installation with proper cables

• Verify proper function before activating in the production environment

The PR9268/301-100 allows deviation from nominal measuring direction. You can achieve ±10° without lifting or sinking current. With lifting or sinking current, you can reach ±30° deviation. The recommended maximum lifting current is 1.8 mA.

Cable and Connector Details

The EPRO PR9268/301-100 comes with a 5-meter armored cable (cable code A=1). The cable end features open cable ends (B00=100) for direct wiring. This configuration is required for OPR and RAD transducer versions. The cable includes an oil-proof PTFE covered metal protection hose for harsh environments.

Packing List

• 1 x EPRO PR9268/301-100 Electrodynamic Velocity Sensor

• 1 x Mounting hardware kit

• 1 x Installation instruction manual

Frequently Asked Questions (FAQ)

Q: What is the difference between PR9268/301-100 and PR9268/207-000?
A: The PR9268/301-100 is for horizontal mounting with a 5-meter armored cable. The PR9268/207-000 is for vertical mounting with a 10-meter non-armored cable. Horizontal version has higher transverse sensitivity at 0.27 versus 0.13 for vertical.

Q: Can the PR9268/301-100 be used in radioactive environments?
A: Yes. The EPRO PR9268/301-100 is available in RAD version for radioactive environments. It includes a PTFE covered metal protection hose for such demanding applications. Always verify compatibility with your specific radiation levels.

Q: What is the maximum vibration amplitude this sensor can measure?
A: The PR9268/301-100 measures up to 3000 µm peak-peak at nominal mounting position. Internal limit stops activate at 4000 µm peak-peak to prevent mechanical damage. This protects the sensor during over-range events.

Q: How do I handle the open cable ends on this sensor?
A: The PR9268/301-100 comes with open cable ends for direct wiring. You must use proper termination methods and ensure EMC-compatible installation. The armored cable provides additional protection in hostile environments.