وصف
Bently Nevada 3300/55-03-01-15-15-00-00-01-00 Dual Velocity Monitor
Configured for casing vibration measurement in the Bently Nevada 3300 Machinery Protection System, the Bently Nevada 3300/55-03-01-15-15-00-00-01-00 (3300/55 Dual Velocity Monitor) provides direct physical execution of transducer signal acquisition and alarm relay switching.
Suffix Breakdown & Model Matrix
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Option Code
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Specification
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3300/55
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Dual Velocity Monitor Module
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-03
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Channel Input Option: Peak Velocity
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-01
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Transducer Type: Seismoprobe Velocity Transducer
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-15
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Channel A Full-Scale Range: 0 - 1.0 in/s Peak
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-15
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Channel B Full-Scale Range: 0 - 1.0 in/s Peak
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-00
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Agency Approval: None
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-00
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Safety Barrier: Not Installed
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-00
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Display Output: Standard Front-Panel Bargraph
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-01
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Relay Option: Epoxy-Sealed Relays
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-00
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Power Supply / System Type: Standard Rack
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Hardware Specifications
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Parameter
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Specification
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Brand
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Bently Nevada
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Origin
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United States
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Weight
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1.0 kg
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Dimensions
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Single Slot (3300 Series Rack)
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Operating Temp
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0 degC to +65 degC
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Storage Temp
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-40 degC to +85 degC
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Relative Humidity
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95% non-condensing
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Power Consumption
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8 W typical
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Input Impedance
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10 kOhm nominal
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Signal Accuracy
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+/-0.5% of full scale @ +25 degC
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Frequency Response
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3 Hz to 3000 Hz (jumper selectable)
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Recorder Output
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4-20 mA DC (Short-circuit protected)
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Relay Rating
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5 A @ 120 VAC / 24 VDC resistive
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Eddy-Current Probe Scaling and Gap Voltage Validation
The 3300/55 module interfaces with Seismoprobe velocity transducers which require precise scaling calibration against the monitor's full-scale range. For systems utilizing proximity probes alongside this monitor, gap voltage validation must target -10 VDC to ensure linear displacement measurement. The module incorporates cross-talk suppression circuitry between Channel A and Channel B to prevent signal interference when monitoring adjacent bearing housings on the same rotor train. This ensures that transient vibration events are isolated to the affected channel without inducing false Danger alarms on parallel monitoring paths.
Frequently Asked Questions
Q: Can the 3300/55 monitor be hot-swapped from the 3300 rack?
A: No. The module must be de-energized prior to removal or insertion to prevent arcing on the backplane connectors and to avoid false relay actuation.
Q: What is the recommended gap voltage for interfacing proximity probes with this monitor?
A: When used in mixed-transducer configurations, maintain a gap voltage target of -10 VDC to ensure operation within the linear range of the eddy-current probe driver.
Q: Does the epoxy-sealed relay option support 24 VDC inductive loads?
A: The standard epoxy-sealed relays are rated for 5 A resistive loads. For inductive loads, external suppression circuitry must be installed to prevent contact welding.
Field Installation Guidelines
Mount the module in a standard 3300 rack slot and secure the retaining screws to the chassis. Use shielded twisted-pair cable for transducer wiring; terminate the shield drain wire to the rack ground terminal only at the monitor end. Ensure that the velocity transducers are torqued to the manufacturer's specified mounting torque to prevent resonance artifacts. Verify jumper settings for low-pass and high-pass filters prior to energizing the system. Perform a functional loop check by applying a known calibration signal to confirm the 4-20 mA recorder output scaling matches the front-panel bargraph indication.
