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Bently Nevada 991-25-50-01-00 Thrust Transmitter

Configured for axial shaft displacement measurement in rotating machinery, the Bently Nevada 991-25-50-01-00 (991 Thrust Transmitter) provides direct physical/electrical signal conversion for thrust position monitoring within Bently Nevada TSI monitoring architectures.

Hardware Specifications

Parameter	Specification
Model	991-25-50-01-00
Brand	Bently Nevada
Product Type	Thrust Transmitter
Origin	USA
Full-scale Option	25-0-25 mils
System Length Option	5.0 metres (16.4 feet)
Mounting Option	35 mm DIN-rail clips
Agency Approval Option	Not required
Measurement Function	Axial shaft position / thrust displacement transmission
Output Interface	4-20 mA proportional transmitter output
Input System	Bently Nevada proximity probe system interface

Eddy-Current Probe Scaling and Gap Voltage Validation

The 991 series Thrust Transmitter processes displacement signals from eddy-current probe systems and converts probe movement into a proportional current output. The transmitter scaling corresponds to the configured full-scale range, allowing axial position changes to be represented within the monitoring loop.

The system operation depends on correct probe gap positioning and signal conditioning. Gap voltage validation follows Bently Nevada proximity measurement principles, including the typical -10 VDC target reference used for probe operating verification. Proper probe scaling supports accurate thrust position interpretation and rotor axial movement analysis.

Frequently Asked Questions

Q: What type of measurement does the 991-25-50-01-00 perform?
A: The transmitter measures axial shaft displacement using a compatible eddy-current proximity probe system and converts the signal into a 4-20 mA output.

Q: What mounting method is specified for this model?
A: This model includes a 35 mm DIN-rail clip mounting option for cabinet installation.

Q: Does this model include agency approval certification?
A: The 991-25-50-01-00 configuration specifies that agency approval is not required.

Field Installation Guidelines

Install the transmitter on a stable DIN rail surface inside an appropriate control cabinet enclosure. Maintain separation between probe signal wiring and high-voltage power cables to reduce electrical interference.

Verify the proximity probe connection, extension cable compatibility, and probe gap voltage before commissioning. Use proper shield termination practices according to site grounding requirements.

Confirm the configured full-scale range and system cable length before integrating the 4-20 mA output into the monitoring or control system. Avoid mechanical stress on field wiring and ensure terminal connections remain secure during operation.

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