Bently Nevada 991 Series Modules - 991-06-XX-01-05 MOD:164113-01

Technical Dossier

Product Details And Specifications

Bently Nevada 991 Series Technical Notes

991 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Bently Nevada 991 Series. Units are categorized by primary measurement function.

Thrust / Axial Position Transmitters

• 991-06-XX-01-05 MOD:164113-01: Thrust position transmitter, 4–20 mA output, enhanced EMI shielding, -05 connector config
• 991-06-XX-01-01: Thrust position transmitter, 4–20 mA, standard terminal block termination
• 991-06-XX-01-03: Thrust position transmitter, 4–20 mA, conduit entry variant, NEMA 4X housing
• 991-05-XX-01-01: Axial position transmitter, previous-generation signal conditioning, 4–20 mA
• 991-05-XX-01-05: Axial position transmitter, -05 connector, compatible with 3300 XL probe systems

Radial Vibration Transmitters

• 991-04-XX-01-01: Radial vibration transmitter, 4–20 mA, configurable full-scale range
• 991-04-XX-01-05: Radial vibration transmitter, -05 connector, dual-output capable
• 991-02-XX-01-01: Radial vibration transmitter, early-generation, fixed 200 mil full-scale
• 991-02-XX-02-01: Radial vibration transmitter, 100 mil full-scale, 7200 Series probe compatible
• 991-01-XX-01-01: Single-channel vibration transmitter, original series, 4–20 mA, fixed scaling

Eccentricity / Speed / Phase Reference Transmitters

• 991-06-XX-02-01: Eccentricity transmitter, 4–20 mA, slow-roll compensation, turbine startup monitoring
• 991-06-XX-03-01: Speed transmitter, pulse-to-analog conversion, 4–20 mA, 0–10,000 RPM range
• 991-06-XX-04-01: Phase reference transmitter, once-per-revolution keyphasor signal conditioning
• 991-04-XX-03-01: Speed transmitter, previous-generation, compatible with magnetic pickup inputs
• 991-04-XX-04-01: Keyphasor transmitter, 4–20 mA phase output, earlier EMI specification

Quality Control for the 991 Series Range

The 991 Series transmitter presents specific quality verification challenges due to its internal analog signal conditioning circuitry and proprietary gap voltage calibration. DriveKNMS applies the following test protocol to all 991 Series units prior to dispatch. Each unit undergoes bench-level power-on verification at rated supply voltage (18–30 VDC). Output linearity is verified across the full 4–20 mA range using a calibrated decade resistance box and precision current meter (accuracy ±0.05% FS). Gap voltage input simulation is performed using a variable DC source to replicate proximity probe output across the specified measurement range (typically –2 VDC to –18 VDC). Zero and span calibration points are verified against the unit's original factory calibration label where present. For MOD-designated variants (e.g., MOD:164113-01), internal modification records are cross-referenced against Bently Nevada service bulletins to confirm modification scope and compliance. Units exhibiting output drift exceeding ±0.5% FS, non-linear response, or connector damage are quarantined and not offered for sale. Final packaging includes ESD-protective bags, foam-lined cartons, and humidity indicator cards for international shipment.