Bently Nevada 990-05-70-02-01 Vibration Transmitter

Integrated Vibration Sensing with the 990-05-70-02-01

The 990-05-70-02-01 converts seismic vibration into a proportional 4–20 mA signal for plant control systems. This transmitter integrates the sensor and signal conditioning inside one sealed housing. Reliability engineers therefore mount it directly on bearing housings and machine frames. Its threaded body installs quickly without separate probe drivers or extension cables.

Detailed Technical Parameters

Signal conditioning defines , because the internal circuit converts acceleration into a stable current loop output. The sealed housing protects the electronics from oil mist and moisture. Meanwhile, the terminal chamber accepts standard field wiring without special connectors. Review the essential specifications in the table below.

Parameter	Specification
Function	Seismic vibration transmitter with current loop output
Output signal	4–20 mA proportional to vibration
Measurement range	0–25 mm/s velocity
Dimensions (W × H × D)	35 × 75 × 35 mm
Weight	Approximately 0.25 kg
Interface	Two-wire 4–20 mA loop connection
Component count	Sensor element plus signal conditioning circuit
Energy storage	None (loop-powered device)
Operating temperature	-25 °C to 85 °C

Integration into Plant Systems

The threads into the machine housing and connects through a two-wire loop. Technicians therefore complete installation without extra junction boxes or drivers. Consequently, vibration monitoring starts within minutes during commissioning. The transmitter draws power directly from the current loop and requires no separate supply. Furthermore, the wide temperature range suits outdoor pump skids and compressor stations.

Why Plants Choose This Transmitter

Many facilities still rely on loop-powered vibration monitoring for proven machine protection. Hence, the 990-05-70-02-01 serves as a practical spare for keeping protection channels online. Its standardized thread format simplifies stock management across multiple sites. In addition, the sealed construction withstands washdown and dusty environments. This transmitter keeps vibration data flowing and maintenance schedules on track.