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The Bently Nevada 990-05-50-02-00, also cataloged as the 990 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) full-scale measurement range
-50 System Length Option 5.0 meters (16.4 feet) total system length
-02 Mounting Option Bulkhead screws mounting configuration
-00 Agency Approval Option No hazardous area approvals required

Hardware Specifications

Parameter Specification
Model 990-05-50-02-00
Brand Bently Nevada
Origin USA
Product Type Vibration Transmitters
Input Device Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable
Full-Scale Range 0-5 mils pp (0-125 um pp)
System Length 5.0 meters (16.4 feet)
Power Supply +12 to +35 VDC input at the transmitter terminals
Output Signal 4-20 mA DC loop proportional to vibration amplitude
Mounting Bulkhead screws
Operating Temp -35 to +85 deg C (-31 to +185 deg F)
Storage Temp -51 to +100 deg C (-60 to +212 deg F)
Dimensions Standard 990 enclosure profile
Weight 1.5 kg (Shipping Weight)
Power Consumption Loop-powered via +12 to +35 VDC supply circuit

Gap Voltage Validation (-10 VDC Targets) & Eddy-Current Probe Scaling

The transmitter processes raw high-frequency signals generated by a 3300 NSv eddy-current proximity probe across a tuned 5.0-meter total system length. Field commissioning requires gap voltage validation to ensure the probe tip maintains a -10 VDC target bias voltage at physical mid-span, setting the baseline for linear displacement tracking. Accurate eddy-current probe scaling converts dynamic shaft movements within the 0-5 mils pp envelope into a proportional 4-20 mA loop signal for direct integration into monitoring hardware.

Frequently Asked Questions

Q: What power input voltage is required at the field terminals?

A: The transmitter requires a DC power supply providing between +12 VDC and +35 VDC directly across the field connection terminals to drive the 4-20 mA loop.

Q: Which proximity sensor components must be connected to this transmitter model?

A: The module accepts input from one non-contacting 3300 NSv proximity probe combined with a matching extension cable configured for a 5.0-meter total system length.

Q: How is the physical enclosure secured inside an instrument cabinet?

A: The -02 mounting option provides integrated surface mounting points designed for direct attachment to panels or bulkheads via mounting screws.

Field Installation Guidelines

  1. Mount the transmitter module securely to a rigid panel or cabinet surface using appropriate bulkhead mounting screws.
  2. Connect the 3300 NSv proximity probe extension cable coaxial connector to the transmitter input interface, securing the threaded connection finger-tight.
  3. Adjust the mechanical probe positioning relative to the target shaft until reaching the required -10 VDC gap voltage target across the raw probe test terminals.
  4. Route two-wire shielded cable from the loop power and signal terminals to the control system analog input channel, ensuring correct DC polarity.
  5. Terminate the overall cable shield at a single point on the main control enclosure grounding bus to prevent ground loops and shield high-frequency noise.

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