Bently Nevada 991-25-70-01-00 Thrust Transmitter
A two-wire loop-powered axial-position transmitter with DIN-rail clips and no agency-approval option.
Overview
991-25-70-01-00 is a Bently Nevada 991 Thrust Transmitter configured for a 25-0-25 mil measurement range and a 7 m 3300 NSv transducer system. Its mounting option supplies 35 mm DIN-rail clips.
The transmitter integrates Proximitor Sensor electronics and converts axial position into a 4–20 mA loop signal for machinery monitoring or control systems.
Specs
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Complete Model | 991-25-70-01-00 |
| Product Family | 991 Thrust Transmitter |
| Measurement Range | 25-0-25 mils |
| Transducer System Length | 7.0 m |
| Mounting Hardware | 35 mm DIN-rail clips |
| Agency Approval Option | Not required |
| Output | 4–20 mA proportional to axial position |
| Loop Power | 12 to 35 V DC |
| Matched Sensor Input | One 3300 NSv probe and extension cable |
Features
- Two-wire operation carries power and measurement on the same current loop.
- Front-access zero and span controls support field calibration of the selected range.
- PROX OUT and COM connections provide direct diagnostic access to the transducer signal.
- A power-up inhibit and fast Not OK response help prevent misleading current output during fault conditions.
Applications
- Axial-position monitoring on small centrifugal compressors and pumps.
- Thrust observation on motors, fans and original-equipment machinery.
- Retrofit loops that require a standard 4–20 mA signal from a matched NSv proximity system.
Lifecycle
- Record the installed probe, extension cable, target material and physical gap before removal.
- Confirm that probe plus extension-cable length totals 7 m.
- Preserve loop scaling, alarm thresholds and polarity in the receiving control system.
- Perform zero, span, Not OK and diagnostic-signal checks after replacement.
FAQ
What is the most important compatibility check for 991-25-70-01-00?
The 3300 NSv probe and extension cable must form the specified 7 m system and be suitable for the target and installed geometry.
Does 991-25-70-01-00 include hazardous-area approvals?
No. The final 00 selects no agency approval; use the exact approved execution when the site classification requires it.
Can 991-25-70-01-00 replace a metric-range 991 transmitter?
No direct substitution should be made because span, calibration and receiving-system scaling would differ.
What loop data should accompany a request for 991-25-70-01-00?
Provide supply voltage, loop resistance, controller input scaling, alarm setpoints and any barriers or isolators.
Which tests should be documented after installing 991-25-70-01-00?
Document mechanical gap, zero and span response, 4–20 mA scaling, fault current behavior and the diagnostic signal.
Is a nearby 991 suffix equivalent to 991-25-70-01-00?
No. Range, total system length, mounting kit and approval code are all functional ordering fields.
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