990-05-70-01-01 | Bently Nevada | 990 Series Vibration Transmitter

Product Overview

The Bently Nevada 990-05-70-01-01 functions as a high-precision, two-wire vibration transmitter that bridges the gap between proximity probes and control systems. It integrates the driver and signal conditioner into one compact module, converting radial vibration into a standard 4-20 mA DC output. This model supports a 7.0-meter system length, allowing for flexible field wiring without sacrificing signal accuracy. We supply this unit as 100% brand new and original factory equipment.

Part Number Breakdown

The 990-05-70-01-01 follows a modular configuration to meet specific industrial requirements:

Technical Specifications

The transmitter conditions signals for high-reliability machinery monitoring:

• Input Compatibility: Bently Nevada 3300 or 3300 XL 8mm Proximity Probes.

• Output Range: 4 to 20 mA DC (Linear to peak-to-peak vibration).

• System Calibration: Calibrated for exactly 7.0 meters of total electrical length.

• Frequency Response: 10 Hz to 1,000 Hz (600 to 60,000 cpm).

• Power Supply: 12 to 35 Vdc.

• Operating Temperature: -35°C to +85°C.

Engineering Advantages

• Rackless Integration: By outputting a 4-20 mA signal directly, this transmitter removes the need for expensive rack-based monitoring systems. Engineers connect the device directly to any standard analog input card on a PLC or DCS.

• Enhanced Signal Transmission: Converting high-frequency eddy current signals into a 4-20 mA current loop locally prevents signal degradation over long distances. This ensures high noise immunity in environments with heavy electromagnetic interference (EMI).

• Flexible Deployment: The 7-meter system length provides the necessary reach for large machinery where the probe and the transmitter must reside in separate locations or within complex enclosure layouts.

• Rapid Field Diagnostics: The unit features a buffered voltage output. Maintenance personnel connect a portable data collector to this port to analyze vibration waveforms in real-time without interrupting the primary safety loop.

FAQs

• What happens if I use a 5-meter probe with this 7-meter transmitter?

  The system will lose calibration accuracy. The 990-05-70-01-01 requires a combined probe and extension cable length of exactly 7.0 meters to maintain the specified linearity and scale factor.

• Does this unit require a separate power supply?

  No. The 990-05-70-01-01 is loop-powered. It draws its required operating voltage directly from the 4-20 mA signal loop provided by the control system (PLC/DCS).

• How do I verify the "OK" status of the sensor?

  If the transmitter detects a probe fault or cable break, the 4-20 mA signal typically drops below 3.6 mA. Your control system should be configured to recognize this low current as a "Not OK" status rather than a vibration alarm.

• Is this product ready for immediate installation?

  Yes. This is a brand new unit shipped in original packaging, fully tested and calibrated according to Bently Nevada factory standards.