Bently Nevada991 Series Thrust Transmitter | 991-25-70-01-CN

Product Overview

The Bently Nevada 991-25-70-01-CN provides critical axial position monitoring for high-speed rotating machinery. This transmitter integrates a proximity probe driver and a signal conditioner into a single, high-performance unit. It converts complex eddy current signals into a linear 4 to 20 mA DC output for direct communication with your PLC or DCS. We supply this unit as 100% Brand New and Original in factory packaging, ensuring compliance with global safety and engineering standards.

Part Number Breakdown

The 991 series modular code defines the measurement range, electrical length, and safety certifications required for your specific application:

Technical Specifications

The 991-25-70-01-CN maintains precision in demanding industrial environments:

• Output Signal: 4 to 20 mA DC (Proportional to axial thrust)

• Measurement Range: 1.2 mm - 0 - 1.2 mm

• System Compatibility: Designed for 3300 XL 8 mm Proximity Probes

• Electrical System Length: 7.0 meters (Probe + Extension Cable)

• Operating Temperature: -35°C to +85°C (-31°F to +185°F)

• Input Power: +17.5 to +30 Vdc

• Certifications: Fully certified for Hazardous Areas (ATEX, IECEx, NEPSI)

Engineering Advantages

• Extended Measurement Range: The "25" option offers a wide 1.2-0-1.2 mm scale. This solves the challenge of monitoring machines with significant thermal expansion or axial float that exceeds standard sensor ranges.

• Global Hazardous Area Compliance: The "CN" suffix confirms the unit meets ATEX, IECEx, and NEPSI standards. This allows for safe deployment in explosive atmospheres across international markets, specifically within the Chinese industrial sector.

• Rackless Integration: By outputting a linearized 4-20 mA signal, this transmitter removes the need for a 3500 monitoring rack. This significantly lowers the total cost of ownership for smaller pump, motor, and fan sets.

• High-Density DIN-Rail Mounting: The 01 mounting option features integrated 35 mm DIN-rail clips. This design enables fast, secure installation in space-constrained control cabinets and junction boxes.

FAQs

• Can I use a 5.0m or 9.0m cable with this transmitter?

  No. This unit is calibrated for a 7.0-meter total electrical system length. Using a different length will result in inaccurate position data and potential false trips.

• Does this unit include a buffered output for diagnostics?

  Yes. Every 991 transmitter includes a BNC connector that provides a raw buffered signal. You can connect a portable analyzer to verify probe health and vibration signatures without disconnecting the 4-20 mA loop.

• Is this product used or surplus?

  No. We only sell Brand New and Original Bently Nevada equipment. Each unit ships in its original factory box and includes a standard 12-month factory warranty.

• How does the "25" range compare to the "06" range?

  The "25" range (1.2-0-1.2 mm) is twice as wide as the standard "06" range (0.6-0-0.6 mm), making it ideal for larger machinery where greater axial movement is expected during operation.