The Bently Nevada 990-05-70-02-00 serves as the primary 990 Vibration Transmitter utilized to execute proximity signal conditioning and velocity-proportional loop current conversion across machinery monitoring platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 990-05-70-02-00 |
| Brand | Bently Nevada |
| Origin | USA |
| Product Type | Vibration Transmitter |
| Frequency Response | 5 Hz to 6000 Hz (+0, -3 dB) |
| Loop Voltage | 12 to 36 VDC |
| Output Signal | 4-20 mA DC proportional to vibration velocity |
| Prox Out Linear Range | 1.4 mm (begins at approx. 0.25 mm from target) |
| Prox Out Incremental Scale Factor | 7.87 mV/um typical |
| Minimum Target Size | 9.5 mm (0.375 in) diameter |
| Operating Temp | -40 to 85 deg C (-40 to 185 deg F) |
| Dimensions | Standard 990 enclosure profile |
| Weight | Standard 990 housing weight |
| Power Consumption | Loop-powered via 4-20 mA current loop |
Gap Voltage Validation (-10 VDC Targets) & Eddy-Current Probe Scaling
The transmitter interfaces directly with an eddy-current proximity probe, evaluating target displacement via an incremental scale factor of 7.87 mV/um over a 1.4 mm linear range. Proper field setup requires gap voltage validation to ensure the probe tip is offset approximately 0.25 mm from the target surface, achieving the ideal -10 VDC bias point for unclipped dynamic tracking. This accurate probe scaling allows reliable processing of dynamic shaft movements before transmitting a proportional 4-20 mA signal to process control hardware.
Frequently Asked Questions
Q: What power input is required to operate the transmitter current loop?
A: The transmitter uses a 2-wire loop-powered configuration accepting a loop voltage between 12 VDC and 36 VDC to drive the 4-20 mA output signal.
Q: What is the frequency measurement range for vibration velocity processing?
A: The module processes vibration signals within a frequency response bandwidth of 5 Hz to 6000 Hz (+0, -3 dB).
Q: What are the physical target requirements for the proximity probe interface?
A: The proximity sensor requires a minimum conductive target surface diameter of 9.5 mm (0.375 in) to maintain accurate scale factor calibration.
Field Installation Guidelines
- Mount the transmitter module securely inside an enclosure or onto panel mounting points using appropriate mechanical fasteners.
- Connect the eddy-current proximity probe extension cable to the dedicated transmitter input terminal.
- Measure static DC voltage across the raw proximity output terminals to validate proper target gap distance (-10 VDC target bias).
- Run 2-wire shielded cable from the 4-20 mA loop terminals to the PLC or DCS analog input card, observing correct DC voltage polarity.
- Terminate the cable shield at the system rack earthing bar to prevent electromagnetic interference and ground loop noise.
What's clients say about us
Excellent Emergency Support!
Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.
Mark Thompson
Maintenance Manager, USAReliable Source for New Spares
Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.
Robert Hoffmann
Engineering Lead, GermanyTop-tier Service and Quality
We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.
Lucas Müller
Operations Director, GermanyRelated Products
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Guide
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