Overview
The Bently Nevada 3300/50-02-02-00-00, also cataloged as the 3300/50 Tachometer Monitor Module, 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 | 3300/50-02-02-00-00 |
| Brand | Bently Nevada |
| Origin | USA |
| Product Type | Tachometer Monitor Modules |
| Measurement Function | Shaft rotational speed, acceleration, and zero-speed detection |
| System Platform | Bently Nevada 3300 Monitoring System |
| Input Channels | 2 proximity transducer inputs or magnetic pickup inputs |
| Input Impedance | 10 kOhm nominal |
| Speed Measurement Range | 1 to 99,999 rpm |
| Zero Speed Detection | Below 100 rpm threshold |
| Acceleration Range | -9,999 to +9,999 rpm/min |
| Display Accuracy | +/- 1 rpm at +25 deg C |
| Display Type | Dual 5-digit LCD display |
| Display Parameters | rpm, acceleration, probe gap voltage, zero-speed status |
| Recorder Output | Programmable +4 to +20 mA, 0 to -10 VDC, or +1 to +5 VDC |
| Buffered Transducer Output | Front panel coaxial output, 100 Ohm output impedance |
| Relay Type | Hermetically sealed Alert/Danger relay contacts |
| 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 |
| Rack Position | 1 slot in Bently Nevada 3300 rack |
| Weight | Approx. 1.0 kg |
| Power Consumption | 2.5 Watts nominal |
| Dimensions | Not specified in provided technical data |
Eddy-Current Probe Scaling and Rotor Dynamics Monitoring
The 3300/50 module processes input signals from Bently Nevada proximity transducers and magnetic pickups to calculate shaft rotational speed and acceleration values. Furthermore, the monitor applies eddy-current probe scaling principles to convert probe signals into measurable rotational parameters.
The module accepts two independent transducer signals and compares both inputs through internal voting logic. Therefore, the system reduces incorrect zero-speed indications caused by a single sensor malfunction. The buffered outputs allow technicians to analyze raw probe signals and verify rotor dynamics behavior during commissioning and troubleshooting.
The module also supports probe gap voltage monitoring. In Bently Nevada proximity systems, technicians can validate eddy-current probe operation by checking gap voltage conditions, including standard -10 VDC target references used for probe calibration and signal verification.
Frequently Asked Questions
Q: Can the 3300/50-02-02-00-00 monitor zero-speed conditions directly?
A: Yes. The module detects shaft speeds below 100 rpm and provides zero-speed status through the monitor display and relay outputs.
Q: What type of field sensors can connect to this tachometer monitor?
A: The module accepts Bently Nevada 3300, 7200, and 3000 series proximity transducers or compatible magnetic pickup inputs.
Q: Does the module provide raw transducer signal access?
A: Yes. The front panel provides buffered transducer outputs through coaxial connectors for signal analysis and troubleshooting.
Field Installation Guidelines
- Install the module only in an approved Bently Nevada 3300 rack slot. Do not use slots reserved for the power supply or system monitor.
- Connect proximity probe wiring according to Bently Nevada signal grounding and shielding practices.
- Maintain separation between probe signal cables and high-current power wiring to reduce electrical interference.
- Verify probe gap voltage before machine operation to confirm correct eddy-current probe installation.
- Confirm relay wiring polarity and external control circuit requirements before applying operating power.
- Inspect coaxial buffered outputs during commissioning to verify clean sensor waveform transmission.
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