The Bently Nevada 990-05-50-01-00, also cataloged as the 990 2-Wire Vibration Transmitter, operates as a dedicated hardware component for proximity probe signal conditioning and 4-20 mA current loop conversion within machinery protection networks.
Suffix Breakdown & Model Matrix
| Option Code | Option Description | Technical Definition |
|---|---|---|
| 990 | Base Model | 2-Wire Vibration Transmitter |
| -05 | Full-scale Option | 0-5 mils pp (0-125 um pp) vibration amplitude range |
| -50 | System Length Option | 5.0 metres (16.4 feet) total calibrated system length |
| -01 | Mounting Option | 35 mm DIN rail clips installed |
| -00 | Agency Approval Option | No hazardous area approvals required |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 990-05-50-01-00 |
| Brand | Bently Nevada |
| Origin | USA |
| Product Type | Vibration Transmitters |
| Measurement Range | 0-5 mils pp (0-125 um pp) |
| System Length | 5.0 metres (16.4 feet) |
| Minimum Target Size | 9.5 mm (0.375 in) diameter |
| Output Signal | Proportional 4-20 mA loop current |
| Mounting Interface | 35 mm DIN rail clips |
| Operating Temp | Standard 990 transmitter rating |
| Dimensions | Standard 990 enclosure profile |
| Weight | 0.43 kg |
| Power Consumption | Loop-powered via 4-20 mA current loop |
Gap Voltage Validation (-10 VDC Targets) & Eddy-Current Probe Scaling
The transmitter processes high-frequency eddy-current signals from a non-contacting probe across a calibrated 5.0-metre system length. Commissioning requires physical gap voltage validation across raw probe test terminals to ensure the sensor tip achieves a -10 VDC static bias voltage at the physical center of its linear span. Precise eddy-current probe scaling converts dynamic shaft displacement across targets as small as 9.5 mm (0.375 in) in diameter into a 4-20 mA current signal without phase distortion or amplitude degradation.
Frequently Asked Questions
Q: What minimum target area is required for accurate displacement measurement?
A: The transmitter requires a minimum observed target diameter of 9.5 mm (0.375 in) directly facing the probe tip to maintain specified probe scaling and linear current output.
Q: How is loop power supplied to the module?
A: Operating power is drawn directly from the 2-wire 4-20 mA loop circuit connected to the control system terminal interface.
Q: What mounting method does the -01 option code designate?
A: The -01 mounting option specifies factory-installed 35 mm DIN rail clips attached to the base of the transmitter housing for rail snap-mounting.
Field Installation Guidelines
- Mount the transmitter module securely onto a grounded 35 mm DIN rail inside a protective field enclosure.
- Attach the proximity probe extension cable coaxial connector to the transmitter input interface, tightening hand-tight.
- Validate static DC gap voltage using a multimeter across test points, adjusting physical probe depth to achieve the -10 VDC target voltage.
- Route 2-wire shielded twisted-pair cabling from the output terminals to the DCS or PLC analog input channel.
- Ground the field cable shield at a single earth point on the cabinet earthing bar to mitigate 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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