The Bently Nevada 990-05-70-02-01, also cataloged as the 990 Vibration Transmitter, operates as a dedicated hardware component for converting proximity probe vibration signals into current output signals within machinery protection monitoring systems.

Model Configuration Summary

The 990-05-70-02-01 configuration includes the following factory options:

Hardware Specifications

Proximity Signal Conversion and Machinery Monitoring

The 990 Series transmitter processes displacement signals from compatible proximity probe systems and converts the vibration measurement into a proportional current output for monitoring systems.

The transmitter uses eddy-current probe signal scaling principles to maintain measurement correlation between shaft position movement and output current variation. Proper probe gap voltage validation is required during installation to confirm the operating point is within the expected range.

The system configuration supports machinery vibration measurement circuits where radial shaft movement and mechanical displacement monitoring are required. Signal integrity depends on correct probe installation, cable routing, and shielding practices.

Ordering Information

• 1 x Bently Nevada 990-05-70-02-01 Vibration Transmitter
• 1 x Integrated 7.0 meter system length configuration
• 1 x Bulkhead screw mounting configuration
• 1 x CSA Division 2 approval configuration
• Additional probes, extension cables, calibration tools, manuals, and accessories are not included unless specifically listed

Field Installation Guidelines

Mechanical Installation

• Mount the transmitter using the specified bulkhead screw configuration.
• Confirm the mounting surface provides stable mechanical support.
• Avoid installation locations with excessive vibration or mechanical impact.

Electrical Connection

• Apply +12 to +35 VDC input power at the transmitter terminal.
• Verify loop resistance remains within the specified operating limitation.
• Maintain proper cable shielding and grounding practices to reduce electrical interference.

Signal Verification

• Confirm proximity probe installation and gap voltage before system commissioning.
• Check output current response against the expected vibration displacement range.
• Inspect cable routing to prevent contact with high-temperature surfaces or rotating equipment.

Technical FAQ

• What measurement range is configured for the 990-05-70-02-01?

The transmitter is configured for a full-scale vibration measurement range of 0-5 mils peak-to-peak (0-125 um pp).

• What power supply does this transmitter require?

The unit requires +12 to +35 VDC input applied at the transmitter terminal for operation.

• What is the maximum allowed loop resistance?

The maximum loop resistance is 1,000 ohms including cable resistance when operating with a 35 VDC supply.

• What mounting method is used on this model?

The 990-05-70-02-01 configuration uses bulkhead screws as the mounting option.

• What system cable length is included with this configuration?

This model configuration includes a 7.0 meter (23.0 feet) system length option.

• Does this transmitter require proximity probe signal calibration?

Yes. Proper probe gap adjustment and signal verification are required to ensure accurate displacement measurement.

• What type of signal does the transmitter process?

The transmitter processes proximity probe vibration signals and converts them into a proportional monitoring output.

• Can the transmitter be installed without cable shielding consideration?

No. Cable shielding and grounding practices should be maintained to reduce electrical noise affecting measurement signals.