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Bently Nevada 3300/50-01-02-03-02 Tachometer Monitor

The Bently Nevada 3300/50-01-02-03-02, also cataloged as the 3300/50 Tachometer Monitor, operates as a dedicated hardware component for shaft speed measurement, acceleration monitoring, and zero speed detection within the Bently Nevada 3300 Monitoring System.

Hardware Specifications

Parameter	Specification
Model	3300/50-01-02-03-02
Brand	Bently Nevada
Origin	USA
Product Type	Tachometer Monitor Module
System Platform	3300 Machinery Protection System
Input Type	Proximity probe and magnetic pickup signals
Input Channels	Up to 2 transducer inputs with voting logic
Input Impedance	10 kOhm nominal
Speed Measurement Range	1 to 99,999 rpm
Rotor Acceleration Range	-9,999 to 9,999 rpm/min
Zero Speed Detection	Typically below 100 rpm
Accuracy	Within +/-1 rpm for speed display; within +/-20 rpm/min for acceleration display at 25 deg C
Buffered Output	Front panel coaxial output per transducer channel
Buffered Output Impedance	100 Ohm
Recorder Output	4-20 mA DC proportional output
Display Type	7-segment LCD display
Alarm Functions	Alert and Danger adjustable setpoints
Relay Operation	Normally energized/de-energized, latching or non-latching modes
Power Consumption	2.5 Watts nominal
Operating Temp	0 deg C to +65 deg C
Storage Temp	-40 deg C to +85 deg C
Relative Humidity	Up to 95%, non-condensing

TSI Signal Processing and Rotor Dynamics Features

The Bently Nevada 3300/50-01-02-03-02 processes rotational speed signals from eddy-current probes or magnetic pickups and converts pulse inputs into shaft speed and acceleration values. The module applies tachometer signal conditioning to maintain measurement accuracy during changing rotor operating conditions.

Furthermore, the module supports eddy-current probe scaling and gap voltage validation principles used in Bently Nevada machinery monitoring systems. The transducer interface evaluates input signal amplitude and operating point conditions to maintain correct measurement conversion.

The module architecture supports rotor dynamics monitoring by tracking speed variation, acceleration behavior, and zero speed conditions. Additionally, the buffered outputs provide isolated access for external diagnostic equipment while maintaining front panel signal availability.

Frequently Asked Questions

Q: Does the 3300/50-01-02-03-02 support dual transducer inputs?
A: Yes. The module accepts up to two transducer inputs and uses internal voting logic to reduce false trip conditions caused by individual signal disturbances.

Q: What output signal does the recorder interface provide?
A: The module provides a proportional 4-20 mA DC recorder output for connection to external PLC, DCS, or data acquisition systems.

Q: Can the module monitor zero speed conditions?
A: Yes. The tachometer function supports zero speed monitoring applications and typically operates below 100 rpm for low-speed detection.

Field Installation Guidelines

Install the 3300/50-01-02-03-02 module inside the designated 3300 rack slot according to the system configuration requirements.

Use shielded signal wiring for proximity probe and magnetic pickup connections. Connect cable shields according to the plant grounding standard to reduce electromagnetic interference.

Maintain proper separation between tachometer signal cables and high-current power wiring. Avoid routing sensor cables near motor feeders, variable frequency drive outputs, or switching power sources.

Verify transducer polarity, signal amplitude, and mechanical target condition before commissioning. For eddy-current probe installations, confirm the probe gap voltage and scaling parameters match the configured monitoring range.

Check relay logic configuration, alarm setpoints, and 4-20 mA output scaling before placing the machinery protection channel into service.

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