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Technical specifications for 3300/20-01-01-02-01-00
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Manufacturer:Bently Nevada
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Product Category:Machinery Monitoring Systems
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Spare Part Number:3300/20-01-01-02-01-00
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Estimated shipping dimensions:5.1×32×20.5cm
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Weight:1.02 kg
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Tariff Code:8537101190
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Counliy of origin:USA
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Measurement channels:2 independent axial-position channels
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Position scale:25-0-25 mils
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Selected transducer sensitivity:200 mV/mil (approximately 8 V/mm)
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Signal input impedance:10 kΩ
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Nominal consumption:1.5 W
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Signal-conditioning accuracy at +25 °C:±0.33% full-scale typical; ±1% maximum
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Recorder output selections:4–20 mA; 1–5 V DC; 0 to -10 V DC
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Current recorder load:0–600 Ω
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Voltage recorder minimum load:10 kΩ
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Buffered output impedance:100 Ω
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Alarm setpoint adjustment:0–100% full-scale; normal and counter directions
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Alarm repeatability:Within 0.39% full-scale
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Alarm delay selections:0.1, 1, 3 or 6 s
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Relay construction:Hermetically sealed
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Safety barrier configuration:None
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Operating temperature:0 to +65 °C
Information
Overview
Manuals
Common Applications
Product Precautions
Bently Nevada 3300/20-01-01-02-01-00 compares two axial-position measurements with independently adjustable normal and counter-thrust alarm levels, helping detect movement toward either clearance boundary.
- Provides separate 63-segment position displays for the two channels.
- Offers bidirectional Alert and Danger thresholds.
- Supports AND voting for the dual-relay alarm arrangement.
- Provides a buffered transducer connection for each channel.
Two probes should observe the same thrust collar or shaft. An out-of-range gap signal can resemble actual axial movement, so dual-channel voting and correct probe adjustment are central to a dependable thrust-protection arrangement.
Important Notice: Verify the actual relay contact circuit and voting configuration before restoring protection. Hermetically sealed relays do not eliminate the need for two correctly adjusted proximity channels.
Bently Nevada 3300/20-01-01-02-01-00 Manuals & Downloads
Bently Nevada 3300/20-01-01-02-01-00 Official Technical Reference Excerpt (PDF)Bently Nevada 3300/20-01-01-02-01-00 Installation & Commissioning Guide (PDF)
The technical excerpt covers monitor characteristics and configuration choices. The installation guide addresses two-probe alignment, field connections, direction checks and alarm acceptance.
Thrust collar position
Measure axial displacement of the collar relative to bearing clearance.
Dual-channel thrust protection
Compare two probes observing the same collar or shaft.
Bidirectional axial travel
Apply normal and counter-thrust thresholds to the selected position scale.
Remote position recording
Send individually scaled channel outputs to a compatible receiver.
Check both axial-position channels and their alarm paths before returning Bently Nevada 3300/20-01-01-02-01-00 to service.
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Identify both probes and the thrust collar they observe.
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Record the current gap and normal-direction setting for each channel.
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Check the 25-0-25 mils scale against the machine travel requirement.
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Verify the 200 mV/mil input sensitivity and transducer supply.
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Retain the selected hermetically sealed relay arrangement.
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Confirm the intended unbarriered signal interface before reconnecting field wiring.
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Test normal and counter Alert and Danger thresholds under the maintenance procedure.
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Restore voting, reset, delay and bypass settings before returning protection to service.
Technical notes
Separate monitor accuracy, recorder-output accuracy, LCD resolution and alarm repeatability when assessing the complete measurement. The recorder-output error is additional to the signal-conditioning error.
FAQ View All FAQ
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Why can a failed probe produce a thrust alarm on 3300/20-01-01-02-01-00?The monitor derives position from probe gap voltage. A failed or out-of-range transducer can resemble shaft movement; two probes observing the same collar with AND voting reduce this vulnerability.
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Can 3300/20-01-01-02-01-00 alarm for movement on both sides of the zero position?Yes. Both Alert and Danger functions have normal and counter-thrust settings, adjustable from 0 to 100% of the selected full-scale range.
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What does the hermetically sealed relay selection change on 3300/20-01-01-02-01-00?It specifies the alarm relay hardware. The monitored position range remains 25-0-25 mils, and the dual-channel alarm logic still needs to be configured for the application.
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How much input-voltage change represents 10 mils of movement on 3300/20-01-01-02-01-00?At the selected 200 mV/mil sensitivity, 10 mils corresponds to a 2 V signal change. This is a calculated conversion; use the actual transducer polarity and normal-thrust setting to determine the indicated direction.
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If a recorder circuit shorts, will 3300/20-01-01-02-01-00 lose its monitoring function?No. Monitor operation is unaffected by short circuits on the recorder outputs. Investigate the recorder wiring separately from the monitor and transducer functions.
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How much load can the 4–20 mA output of 3300/20-01-01-02-01-00 drive?The stated load range is 0–600 Ω, with 0–12 V compliance across the load. Include the complete receiving-loop resistance when assessing the connection.
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Which alarm-delay choices are available on 3300/20-01-01-02-01-00?Plug-in jumpers select 0.1, 1, 3 or 6 seconds. Check the installed delay rather than assuming it from the relay type or full-scale range.
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What does a flashing Alert or Danger indicator identify on 3300/20-01-01-02-01-00?A flashing alarm LED indicates First Out when that function is enabled. Alert and Danger First Out indications are independent.
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