Bently Nevada 991-06-70-01-00 Thrust Transmitter
A metric bidirectional axial-position transmitter configured for the longer standard 3300 NSv system.
Product Identification
991-06-70-01-00 is a Bently Nevada loop-powered thrust transmitter for one seven-metre 3300 NSv probe-and-cable chain. It conditions shaft axial position into a proportional signal for the machinery control system.
Its longer system-length code differentiates it from 991-06-50-01-00 even though the range, DIN mounting and general-purpose approval execution are otherwise aligned.
Engineering Data
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Complete Model | 991-06-70-01-00 |
| Product Family | 991 thrust transmitter |
| Full-Scale Range | −0.6 to 0 to +0.6 mm |
| System Length | 7.0 m (23.0 ft) |
| Mounting Option | 35 mm DIN-rail clips |
| Approval Option | Not required |
| Input | One matched 3300 NSv system |
| Loop Output | 4 to 20 mA DC |
| Not-OK Output | Below 3.6 mA |
| Operating Temperature | −35 to +85 °C |
Functions
- Measures axial position in both directions around the established center point.
- Provides non-isolated diagnostic access plus zero and span controls.
- Detects invalid sensor-chain conditions and defeats the normal loop signal.
- Supports compact DIN-rail installation for OEM machinery panels.
Applications
- Longer-run compressor thrust measurement
- Pump and motor axial-position trending
- DIN-panel control loops using a remote proximity probe
Lifecycle
- Keep the complete seven-metre chain together in spare records.
- Recheck center position after mechanical maintenance.
- Inspect connectors and shielding during planned outages.
FAQ
Can 991-06-70-01-00 replace 991-06-50-01-00 using the same probe cable?
No. The longer total system length requires the corresponding matched probe-and-extension-cable configuration.
What should the control system do with a 991-06-70-01-00 not-OK signal?
Treat the under-range current as invalid measurement status and apply the site’s defined fault and protection logic.
Why is axial center setup important for 991-06-70-01-00?
It determines usable travel in both directions and the validity of alarm or trip thresholds.
Can 991-06-70-01-00 serve as a complete plant-wide diagnostic monitor?
It provides a practical thrust variable, but it does not reproduce every bypass, channel-management and diagnostic function of a dedicated monitoring system.
What equipment is recommended for powered diagnostic testing of 991-06-70-01-00?
Use the specified isolated test-adapter arrangement when connecting grounded AC-powered instruments to PROX OUT.
What should a 991-06-70-01-00 enquiry include?
Provide the transmitter, probe and cable labels, target, gap, thrust direction, controller scaling and installation classification.
