Overview
Manuals
Imperial Thrust
Short Probe Chain
DIN Rail CSA
Features:
- Exact 991-25-50-01-01 two-wire axial-position/thrust transmitter with a 4–20 mA loop output.
- Ordered full-scale execution: 25–0–25 mils axial position range.
- 3300 NSv system-length and mounting executions: 5.0 m system length; 35 mm DIN-rail clips.
The 991-25-50-01-01 accepts one 3300 NSv proximity-probe system and converts axial shaft position into a proportional 4–20 mA current-loop output for thrust-position monitoring. The transmitter operates from +12 to +35 Vdc, supports up to 1000 Ω loop resistance at 35 Vdc, and provides a buffered Prox Out signal for commissioning measurements.
This order code records 25–0–25 mils axial position range, 5.0 m system length, 35 mm DIN-rail clips and CSA Division 2 approval. Before replacement, preserve the established zero/reference position, verify probe/cable compatibility, loop polarity and scaling, and prove the NOT OK response without changing the machine protection setpoints.
The 991-25-50-01-01 Bently Nevada 991 Two-Wire Thrust Transmitter may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 991-25-50-01-01 documentation and reference links.
Important Notice: Official Baker Hughes/Bently Nevada datasheet 141618 identifies this as a 991 Thrust Transmitter, not a 990 Vibration Transmitter. Confirm the complete nameplate, option codes, connected equipment and required controlled documents before replacement.
991-25-50-01-01 uses the documented 25–0–25 mils axial position range execution to convert axial shaft position into its 4–20 mA loop signal. Commission the receiving channel against this exact range, preserve polarity and engineering units, and retain the established thrust datum, alarms and trip logic.
991-25-50-01-01 records 5.0 m system length for the matched 3300 NSv probe and extension-cable chain. Confirm the combined electrical length, connector condition, probe gap and buffered Prox Out response before accepting the loop reading.
991-25-50-01-01 records 35 mm DIN-rail clips with CSA Division 2 approval. Match the physical mounting hardware, terminal access, grounding and approval marking, then prove the NOT OK response through the receiving system without changing protection setpoints.
