Bently Nevada 991-01-XX-01-CN MOD 284318-01 Thrust Transmitter
A region-specific modified 991 transmitter requiring exact calibration and approval-document matching.
Technical Summary
991-01-XX-01-CN MOD 284318-01 is a modified Bently Nevada 991 thrust-transmitter execution with a CN suffix. It converts axial shaft position from a compatible 3300 NSv chain into a two-wire current signal for the control system.
The public standard ordering table does not define the 01 range, XX length or CN suffix as a normal catalog combination. Selection must therefore retain the exact MOD identity and applicable regional documentation.
Specifications
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Complete Identification | 991-01-XX-01-CN MOD 284318-01 |
| Product Family | 991 thrust transmitter |
| Measured Variable | Axial shaft displacement |
| Range Field | 01; modification-specific |
| System-Length Field | XX; modification-specific |
| Mounting Field | 01; DIN-rail clips |
| Regional / Approval Field | CN; exact documentation required |
| Signal Type | Two-wire 4 to 20 mA DC |
| Sensor Input | One matching 3300 NSv chain |
| Diagnostic Connection | Non-isolated PROX OUT |
| Verification Basis | MOD certificate and installed labels |
Features
- Provides compact thrust-position conversion for a machinery-control input.
- Includes test input and non-interacting field adjustment.
- Makes sensor fault status available through the current loop.
- Supports diagnostic signal access when the correct isolation method is used.
Compatibility
- Confirm that the CN execution is acceptable for the destination and site documentation.
- Verify the modified range and total sensor length from the calibration record.
- Match target material, probe, extension cable and controller input as one system.
- Do not replace it with a standard 00, 01 or 05 approval suffix without an engineering review.
Replacement
- Retain the complete MOD and regional labels in the maintenance record.
- Record axial zero, allowed travel and existing alarm thresholds before removal.
- Use the approved probe-gapping and transmitter-adjustment sequence.
- Revalidate regional documentation and the final protection response after replacement.
FAQ
Can 991-01-XX-01-CN MOD 284318-01 be ordered as an ordinary 991-06 transmitter?
No. The nonstandard fields, CN suffix and MOD number must all be matched to the installed documentation.
What does CN mean for 991-01-XX-01-CN MOD 284318-01 purchasing?
Treat it as a region-specific execution and request the exact approval or compliance record rather than translating it to a standard suffix.
Which calibration evidence is needed for 991-01-XX-01-CN MOD 284318-01?
Provide the transmitter certificate or settings showing the axial range, center point, system length and output direction.
Why is probe adjustment critical for 991-01-XX-01-CN MOD 284318-01?
Incorrect gap can prevent the configured span from being available in both thrust directions.
Can the PROX OUT of 991-01-XX-01-CN MOD 284318-01 feed grounded equipment directly?
Use the recommended isolated test-adapter arrangement to protect signal integrity and avoid false alarms.
What final checks are required after replacing 991-01-XX-01-CN MOD 284318-01?
Prove regional-document applicability, axial direction, calibrated travel, not-OK behavior and all controller alarms and trips.
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