Bently Nevada 3300/50-03-01-00-00 Rotor Acceleration

Product Overview

The Bently Nevada 3300/50-03-01-00-00 is a single-channel rotor acceleration tachometer for the 3300 machinery monitoring system. It measures shaft rotational speed and the rate at which rotor speed increases or decreases. Although it is a single-channel monitor, the module accepts two transducer signals. Internal voting logic helps reduce false indications if one input signal fails. The front display can show speed in RPM, rotor acceleration or deceleration in RPM/MIN, and transducer gap values. Proportional recorder outputs support plant data acquisition and trend recording, while the epoxy-sealed alert relay can operate an external annunciator. This monitor is intended for indication and monitoring; it must not be used independently for speed control or overspeed protection.

Order Number Breakdown
3300/50--Bently Nevada 3300 System Tachometer
03--Rotor Acceleration Tachometer
01--Epoxy-Sealed Alert Relay
00--Agency Approval Not Required
00--No External Safety Barrier

Technical Information

Benefits&Features

• Measures shaft speed and rotor acceleration or deceleration
• Speed measurement range from 1 to 99,999 RPM
• Acceleration range from −9,999 to +9,999 RPM/MIN
• Accepts two transducer inputs with internal voting logic
• Supports 3300, 7200 and 3000 Series proximity probe systems
• Can also operate with compatible magnetic pickup inputs
• Displays RPM, RPM/MIN and probe gap information
• Programmable 4–20 mA, 1–5 VDC or 0 to −10 VDC recorder outputs
• Adjustable events-per-revolution configuration
• Front-panel buffered outputs simplify signal testing
• Epoxy-sealed alert relay provides external annunciation
• Nonvolatile memory retains programmed alarm settings  

Application Areas

-Turbine speed monitoring during startup and shutdown
-Rotor acceleration and deceleration trending
-Compressor and generator shaft-speed monitoring
-Large motor run-up and coast-down observation
-Machinery speed data transmission to plant recording systems
-External alarm annunciation based on speed or acceleration conditions
-Maintenance analysis of abnormal rotor speed changes  

Main brands

Frequently Asked Questions

1. What does the 3300/50-03-01-00-00 measure?
It measures shaft rotational speed from 1 to 99,999 RPM and rotor acceleration or deceleration from −9,999 to +9,999 RPM/MIN.

2. What does the “03” option identify?
The “03” code identifies the Rotor Acceleration Tachometer version. It provides both shaft-speed and rate-of-speed-change measurements.

3. How many transducer signals can the monitor accept?
It accepts two transducer signals. Internal voting logic compares the inputs and helps minimize false indications caused by the failure of one transducer.

4. What recorder outputs are available?
The recorder output can be programmed for 4–20 mA, 1–5 VDC or 0 to −10 VDC. Separate proportional outputs are provided for shaft speed and rotor acceleration.