The Bently Nevada 990-05-XX-03-01 MOD:168251-01, also cataloged as the 990 Vibration Transmitter, operates as a dedicated hardware component for converting proximity vibration signals into monitoring outputs within Bently Nevada machinery protection systems.

Configuration Identification

The 990-05-XX-03-01 MOD:168251-01 configuration contains selectable system length options and mechanical mounting features.

Hardware Specifications

Eddy-Current Signal Processing Characteristics

The Bently Nevada 990 Series transmitter processes proximity probe displacement signals and converts the measured vibration information into a proportional monitoring output.

The transmitter operation depends on correct eddy-current probe scaling, where shaft displacement variation is converted into an electrical measurement signal. During installation, gap voltage validation is required to confirm correct probe operating position and measurement accuracy.

The unit is designed for machinery vibration monitoring circuits requiring consistent displacement signal conversion. Proper cable routing, grounding, and shielding practices reduce electrical interference and maintain signal quality.

Ordering Information

• 1 x Bently Nevada 990-05-XX-03-01 MOD:168251-01 Vibration Transmitter
• 1 x 0-5 mils pp measurement range configuration
• 1 x DIN clip and screw mounting hardware configuration
• 1 x CSA Division 2 approval configuration
• System cable length selection includes 5.0 meter or 7.0 meter option
• Additional proximity probes, extension cables, manuals, and calibration accessories are not included unless specified

Field Installation Guidelines

Mechanical Mounting

• Install the transmitter using the supplied DIN clips and screws mounting arrangement.
• Verify mechanical fixation before connecting field wiring.
• Avoid locations exposed to excessive mechanical shock or external vibration.

Electrical Wiring

• Follow standard industrial signal wiring practices for proximity monitoring circuits.
• Maintain cable shielding continuity through the complete measurement path.
• Separate signal wiring from high-voltage power cables to reduce electromagnetic interference.

Commissioning Checks

• Verify proximity probe gap voltage before operation.
• Confirm measurement range configuration matches the monitoring application.
• Check output signal behavior during initial machinery rotation.

Frequently Asked Questions

• What vibration range is configured for this transmitter?

The 990-05-XX-03-01 MOD:168251-01 is configured with a 0-5 mils pp (0-125 um pp) full-scale measurement option.

• What mounting hardware does this model use?

This configuration uses DIN clips and screws for mechanical installation within the monitoring system enclosure.

• What system cable lengths are supported?

The configuration supports selectable system lengths of 5.0 meters (16.4 feet) and 7.0 meters (23.0 feet).

• What type of sensor signal does the 990 transmitter process?

The transmitter processes proximity probe displacement signals used for vibration measurement applications.

• Is CSA Division 2 approval included in this configuration?

Yes. The 990-05-XX-03-01 MOD:168251-01 includes the CSA Division 2 agency approval option.

• Why is probe gap voltage verification required?

Gap voltage verification confirms the eddy-current probe operates within the correct measurement range before machinery monitoring.

• Does this transmitter require special cable routing?

Signal cables should be routed away from high-voltage conductors and protected from sources of electrical interference.

• Can the measurement range be changed after installation?

The measurement range is defined by the selected factory configuration and should match the intended monitoring application.