Bently Nevada 991-25-70-01-01 Thrust Transmitter

The 991-25-70-01-01 operates as a loop-powered thrust transmitter within the Bently Nevada 991 series. Maintenance teams deploy this device for continuous axial position monitoring on steam turbines and centrifugal compressors. Consequently, it converts eddy current probe signals into standard 4-20 mA outputs.

Technical Specifications

Parameter	Specification
Measurement Type	Axial Thrust Position
Input Signal	Eddy current probe input
Output Signal	4-20 mA, loop-powered
Supply Voltage	12 to 30 VDC
Measurement Range	0 to 25.4 mm (0 to 1.0 in)
Mounting Type	DIN rail or panel mount
Weight	Approximately 400 g
Operating Temperature	-40 °C to +85 °C
Housing Material	Industrial-grade polymer
Terminal Type	Screw terminals
Accuracy	±1% of full scale
Isolation	Galvanically isolated

Operating Principle

This transmitter accepts input from a Bently Nevada proximity probe and oscillator-demodulator. It processes the displacement signal and generates a proportional current loop output. Meanwhile, the loop-powered configuration removes the need for separate power wiring.

Interface and System Integration

The 991-25-70-01-01 links directly to PLCs, DCS platforms, and plant protection systems. Screw terminals simplify field wiring and maintenance tasks. Furthermore, DIN rail mounting saves valuable cabinet space in control rooms.

Environmental and Application Notes

The industrial-grade housing resists dust, moisture, and typical plant contaminants. Additionally, the wide temperature range suits both indoor and outdoor installations. Therefore, this unit performs reliably in demanding industrial environments.