وصف

Bently Nevada 990-04-XX-03-00 Vibration Transmitter

Configured for radial shaft vibration monitoring in API 670 compliant machinery protection architectures, the Bently Nevada 990-04-XX-03-00 (base model 990) provides direct physical execution of 4-20 mA proportional current signaling derived from eddy-current proximity probe input without intermediate monitoring racks.

Suffix Breakdown & Model Matrix

Code Segment	Definition
990	990 Vibration Transmitter Series
04	Full-scale range: 0–4.0 mils pp
XX	System length option (typically 5.0 m or 7.0 m)
03	35 mm DIN-rail mounting
00	No agency approvals

Hardware Specifications

Parameter	Specification
Model Brand	Bently Nevada
Origin	USA
Weight	295 g
Dimensions	Polyamide housing, DIN-rail form factor
Operating Temp	-35 degC to +85 degC
Power Consumption	12–35 VDC loop power
Input Signal	3300 NSv proximity probe system
Output Signal	4–20 mA DC proportional to vibration amplitude
Accuracy	±6% FS over operating temp range
Buffered Output	Coaxial BNC, 7.87 V/mm nominal

Eddy-Current Probe Scaling and Gap Voltage Validation

The transmitter interfaces exclusively with the 3300 NSv eddy-current transducer system, requiring precise probe tip clearance to maintain linear measurement scaling. Calibration targets a -10 VDC gap voltage setpoint for optimal dynamic range. Signal conditioning includes cross-talk suppression between adjacent transducer channels to prevent mechanical resonance coupling errors in rotor dynamics analysis.

Frequently Asked Questions

Q: Can the unit be calibrated without removing it from the DIN rail?

A: Yes. Calibration can be performed in situ using the buffered BNC output while maintaining loop continuity.

Q: Does the transmitter support hot-swapping in live loops?

A: No. Loop power must be disconnected before removal to avoid transient overcurrent on the 4–20 mA line.

Q: What is the effect of incorrect system length selection?

A: Incorrect length mismatches alter probe scaling constants, causing inaccurate vibration amplitude reporting.

Field Installation Guidelines

Install the transmitter on a grounded 35 mm DIN rail within an IP-rated enclosure. Maintain separation between signal and power wiring to minimize electromagnetic interference. Terminate shield drains to earth ground at one end only. Verify probe gap voltage prior to final commissioning. Ensure all terminal screws meet torque specifications for 0.2–2.5 mm² conductors.

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