Bently Nevada 991-06-50-01-CN Vibration Transmitter

The 991-06-50-01-CN functions as a loop-powered vibration transmitter within the Bently Nevada 991 series. Reliability engineers use this device for continuous vibration monitoring on pumps, fans, and compressors. Consequently, it converts raw sensor signals into standard 4-20 mA outputs for control systems.

Technical Specifications

Parameter	Specification
Measurement Type	Velocity (RMS)
Frequency Range	10 Hz to 1 kHz
Output Signal	4-20 mA, loop-powered
Supply Voltage	12 to 30 VDC
Measurement Range	0 to 25.4 mm/s (0 to 1.0 in/s)
Mounting Thread	1/4-28 UNF
Weight	Approximately 150 g
Operating Temperature	-40 °C to +85 °C
Housing Material	Stainless steel
Connector Type	2-pin MIL-style
Accuracy	±5% of full scale
Isolation	Galvanically isolated

How the Transmitter Operates

This unit integrates a piezoelectric sensing element with signal conditioning electronics. The sensor detects casing vibration, and the internal circuit converts it into a proportional current loop. Meanwhile, the loop-powered design eliminates the need for separate supply wiring.

Interface and Mounting Options

The 991-06-50-01-CN connects directly to PLCs, DCS platforms, and SCADA systems. A 2-pin MIL-style connector provides robust field wiring. Furthermore, the 1/4-28 UNF stud mounts quickly onto machine housings.

Environmental and Application Notes

The stainless steel housing resists corrosion, moisture, and industrial contaminants. Additionally, the wide temperature range suits outdoor and high-heat installations. Therefore, this transmitter serves reliably in harsh plant environments.