Bently Nevada 990 Series Vibration Transmitter | 990-05-70-03-00

Product Overview

The Bently Nevada 990-05-70-03-00 functions as a high-precision, loop-powered vibration transmitter designed for direct integration with industrial control systems. It accepts signals from a proximity probe and extension cable, converting the complex eddy current data into a linear 4-20 mA output proportional to peak-to-peak vibration amplitude. This "rackless" solution enables critical machinery monitoring without the cost or footprint of a dedicated monitoring rack. We guarantee this unit is 100% brand new and original equipment.

Part Number Breakdown

The 990-05-70-03-00 configuration follows Bently Nevada's modular logic for 7-meter systems:

Technical Specifications

This transmitter conditions signals with high accuracy for 24VDC loops:

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

• Output Signal: 4-20 mA DC (Proportional to vibration amplitude).

• Measurement Range: 0 to 125 µm (0 to 5 mils) peak-to-peak.

• Proximity Range: 0.25 to 1.65 mm (10 to 65 mils).

• Power Requirement: 24VDC loop-powered (Two-wire).

• Mounting Type: 35mm DIN rail clips.

• Weight: 0.90 kg (Approximate system weight).

Engineering Advantages

• Integrated Proximitor Functionality: The transmitter combines the probe driver and signal conditioner into a single module. This eliminates the need for external drivers and reduces the number of termination points in your junction box.

• Enhanced Noise Rejection: By converting the high-frequency probe signal to a 4-20 mA current loop locally, the unit minimizes electromagnetic interference (EMI) risks. This ensures clean data transmission over long distances to the PLC/DCS.

• Optimized for 7-Meter Runs: The "70" calibration accommodates larger machines or complex cable routing where standard 5-meter cables fall short. It maintains full signal linearity across the entire 7-meter electrical length.

• Simple Maintenance Verification: The 990-05-70-03-00 provides a buffered voltage output. Technicians connect a portable analyzer directly to the transmitter to view the raw vibration waveform without disconnecting any wiring or interrupting the control loop.

FAQs

• Can I use this transmitter with a 3300 XL 5-meter probe? No. This model is factory-calibrated for a 7.0-meter system. Using a 5.0-meter probe and cable will cause significant scale factor errors and inaccurate vibration readings.

• Does the 990-05-70-03-00 require an external power supply? The unit is a two-wire, loop-powered device. It draws the necessary power from the 24VDC supply provided by your PLC or DCS analog input card.

• What happens if the probe cable disconnects? The transmitter includes an "OK" circuit logic. Upon cable failure or probe fault, the 4-20 mA output typically drops below 3.6 mA, allowing the control system to distinguish between a sensor failure and a high-vibration event.

• Is this product refurbished or "new-surplus"? We provide only brand new, factory-original Bently Nevada hardware. Each unit ships in its original manufacturer packaging with full traceability.