Introduction

The Bently Nevada 990-05-XX-01-00 168251-01 is a loop-powered vibration transmitter engineered for reliable condition monitoring of industrial rotating machinery. It converts mechanical vibration signals into a standardized 4–20 mA output for seamless integration into automation and protection systems.

Its compact, integrated architecture eliminates the need for external signal conditioning modules, reducing installation complexity while maintaining stable and accurate vibration measurement performance. The model is widely used in OEM machinery applications where space efficiency, long-term reliability, and standardized control integration are essential.

Technical Specifications

Parameter	Specification
Product Model	990-05-XX-01-00
Configuration Code	168251-01
Full-scale Range	0–5 mils pp (0–125 μm pp)
System Length	5 m or 7 m (configuration dependent)
Mounting Type	DIN rail / bulkhead mounting
Output Signal	4–20 mA proportional vibration signal
Power Supply	2-wire loop powered
Input Voltage	12–35 VDC
Operating Temperature	-35°C to +85°C
Storage Temperature	-51°C to +100°C
Housing Material	Industrial-grade metal enclosure
Dimensions	100.1 × 73.9 × 53.3 mm
Weight	0.43 kg (0.95 lb)

Applications

The Bently Nevada 990-05-XX-01-00 168251-01 Vibration Transmitter is designed for continuous vibration monitoring of rotating machinery in industrial automation systems where reliable signal conversion and stable long-term performance are required.

Typical applications include:

Centrifugal and reciprocating compressors
Industrial pump systems and booster stations
HVAC ventilation and air handling units
Electric motors and drive assemblies
Turbine auxiliary systems
Petrochemical and refinery rotating machinery
Marine and offshore mechanical systems

It is widely used in OEM installations requiring compact integration and standardized 4–20 mA output for control and protection systems.

Advantages

Integrated vibration sensing and signal conditioning in a compact transmitter design
Direct 4–20 mA output for PLC and DCS integration
Reduced wiring complexity and simplified installation
Stable long-term signal performance for continuous monitoring
Strong immunity to industrial electromagnetic interference (EMI)
OEM-optimized mechanical structure for space-constrained equipment layouts
Supports predictive maintenance and condition-based monitoring strategies
Proven reliability in harsh industrial environments

Technical FAQs

Q1: What is the role of the 168251-01 code?
It is an internal configuration or assembly reference used to identify a specific OEM variant within the 990 transmitter series.

Q2: What does “XX” mean in the model number?
It represents configurable system length options (commonly 5 m or 7 m cable/probe assembly depending on configuration).

Q3: What output signal does this transmitter provide?
It provides a 4–20 mA analog output proportional to vibration amplitude.

Q4: What does the “05” represent?
It indicates a 0–5 mils peak-to-peak full-scale vibration measurement range.

Q5: Does it require external signal conditioning?
No, signal conditioning is fully integrated inside the transmitter.

Q6: What equipment is it typically used on?
It is used on pumps, compressors, motors, fans, and other rotating machinery.

Q7: Can it be used for continuous monitoring?
Yes, it is designed for continuous vibration trend monitoring.

Q8: Is it compatible with PLC and DCS systems?
Yes, it directly interfaces with standard industrial analog input systems.

Q9: Does it support waveform diagnostics?
No, it provides overall vibration amplitude rather than waveform-level analysis.

Q10: Is it suitable for harsh industrial environments?
Yes, it is designed for industrial environments with vibration, humidity, and temperature variations.

Look forward to your comments!Comment