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overview：
Bently Nevada 3300/40 eccentricity monitor is designed for online monitoring of shaft eccentricity at low speeds and is suitable for almost all types of rotating and reciprocating machinery.
It provides two eccentricity indications, namely direct eccentricity (instantaneous eccentricity value) and peak-to-peak eccentricity (the difference between the positive and negative extremes of rotor bending); it has online eccentricity monitoring capability, which can measure eccentricity in real time and continuously monitor shaft bending, helping to identify bending caused by thermal, gravity or mechanical factors;
Fuctions & Features:
- Rich measurement types: The 3300/40 Eccentricity Monitor provides two eccentricity indications, including direct eccentricity (i.e., instantaneous eccentricity value) and peak-to-peak eccentricity (i.e., the difference between the positive and negative extremes of rotor bending).
- Online eccentricity monitoring: The 3300/40 Eccentricity Monitor provides real-time eccentricity measurement, which can continuously monitor shaft bending and help identify thermal, gravity or mechanical bending.
- Comprehensive information: In addition to eccentricity measurement, the 3300/40 Eccentricity Monitor can also provide gap voltage and threshold voltage information to help fully understand the operating status of the equipment.
Specification：
| Category | Specifications |
|---|---|
| Inputs | |
| Signal | Accepts two proximity probe signals: one for eccentricity and one for Keyphasor. |
| Input Impedance | 10 kΩ. |
| Signal Scale Factor | 200 mV/mil (8 V/mm) or 100 mV/mil (4 V/mm), jumper selectable. |
| Keyphasor Input | |
| Duty Cycle | 5% minimum. |
| Input Impedance | 90 kΩ. |
| Frequency Range | |
| - Manual Threshold | 0.017 Hz to 10 Hz (1 to 600 cpm). |
| - Automatic Threshold | 1.69 Hz to 10 Hz (100 to 600 cpm). |
| - Simulated Update Rate | Every 60 seconds. |
| Power Consumption | Nominal consumption of 1.5 watts. |
| Signal Conditioning | |
| Frequency Response | |
| - Peak-to-Peak Eccentricity | 0.017 Hz to 10 Hz (1 to 600 cpm). |
| - Direct Eccentricity | 0 to 10 Hz (0 to 600 cpm). |
| Accuracy | Specified at +25°C (+77°F): ±0.33% of full-scale typical, ±1% maximum. |
| Outputs | |
| Recorder Output | User-programmable: +4 to +20 mA, 0 to -10 Vdc, or +1 to +5 Vdc. |
| Recorder Accuracy | Specified at +25°C (+77°F): |
| - +4 to +20 mA | ±0.7% of signal, ±0.09 mA offset. |
| - +1 to +5 Vdc | ±0.8% of signal, ±5 mV offset. |
| - 0 to -10 Vdc | ±0.7% of signal, ±10 mV offset. |
| Output Impedance (Voltage) | 100 Ω. Minimum load resistance is 10 kΩ. |
| Voltage Compliance (Current) | 0 to +12 Vdc range across load. Load resistance is 0 to 600 Ω for +4 to +20 mA. |
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