Configured for absolute machine housing vibration monitoring in 3300 Series systems, the Bently Nevada 3300/25-XX-15-15-00-00-03-02 (3300/25 Dual Accelerometer Monitor) provides direct physical/electrical execution. The module processes acceleration inputs over two independent channels, applying configurable high-pass and low-pass filter combinations to isolate target mechanical frequencies and output continuous proportional tracking signals to the system backplane matrix.

Option Options & Matrix Selection

• 3300/25: Base module model code for the dual-channel accelerometer monitoring interface.
• XX: Full-scale range engineering unit configuration indicator.
• 15: Channel A full-scale scale select, designated at 0-25 mm/s peak value.
• 15: Channel B full-scale scale select, designated at 0-25 mm/s peak value.
• 00: Agency safety certification option selecting standard base rating parameters.
• 00: Internal barrier implementation configuration specifying no internal barriers.
• 03: Internal high-pass/low-pass filter configuration selection matrix.
• 02: Backplane connector architecture format for rack grounding and terminal attachment.

Module Parameters Matrix

Machinery Monitoring & Rotor Dynamics Integration

Integration within the Machinery Protection System architecture allows the module to evaluate high-frequency casing motion parameters, augmenting standard proximity-based rotor dynamics instrumentation loops. The configuration filters raw structural vibration components to identify rolling-element bearing degradation and structural resonance zones. Continuous cross-talk suppression keeps parallel accelerometer signal links clean along crowded field wireways, while standard gap voltage validation interfaces allow technicians to monitor transducer health and circuit paths without interrupting protection loop status.

Hardware Packing Matrix

• 1 x 3300/25-XX-15-15-00-00-03-02 Dual Accelerometer Monitor Module
• 2 x Rear Terminal Block Identification Label Covers

Field Mounting Guidelines

Chassis Insertion and Rack Ground Alignment

• Slide the monitor module completely into the selected 3300 chassis slot along the guide tracks, locking the top and bottom screws down to secure the rear backplane interface.
• Check the grounding connection on the rear terminal block to see that the shield paths tie to the designated rack instrument common earth point.

Transducer Wiring and Signal Line Isolation

• Connect the 100 mV/g field accelerometer inputs through twisted shielded pairs, separating sensor runs from any high-voltage control or motor power wiring conduits.
• Configure the onboard high-pass and low-pass internal jumpers to match the exact machinery operating speed profile before powering up the system loop.

Reference Technical Q&A

• Can this dual accelerometer monitor be pulled out of the rack chassis while the backplane is live?

  No, hot-swap separation of this active monitor requires a complete rack shutdown or bypassing the active protection relays to prevent generating false trip signals or damaging the logic loops.

• How does the system architecture process the 10,000 distinct internal filter configurations?

  Onboard jumper matrices allow field technicians to choose specific high-pass and low-pass frequency cutoffs, isolating specific machinery components like gears or blades from background noise.

• What problem develops if the external transducer input sensitivity drifts away from the 100 mV/g benchmark?

  A shift in transducer sensitivity directly skews the input calibration, causing the monitor to compute incorrect vibration amplitudes that exceed the standard 1.6% full-scale tracking limits.

• What physical tracking metric does this monitor measure compared to standard proximity systems?

  This unit tracks absolute casing vibration using housing acceleration inputs, whereas proximity probes evaluate relative shaft motion within the fluid film bearing clearance envelope.

• How is cross-talk suppression managed across the dual independent channels within the same module?

  The internal circuit boards feature physical copper trace barriers and independent differential input stages to block signal migration between Channel A and Channel B paths.

• What occurs if an integrated accelerometer field circuit path develops an open circuit or shorts out?

  The module identifies the electrical fault condition, illuminates the front-panel NOT OK light indicator, and opens the OK relay contact to prevent false machinery trip actions.

• Does this module supply constant current power directly to the field accelerometers?

  Yes, the hardware incorporates internal current sources to drive connected passive transducers, eliminating the need to add external signal conditioning power interfaces.

• How does setting the full-scale range configuration to 0-25 mm/s peak impact alert trip calculations?

  The full-scale choice sets the operational voltage span limit, which means setpoint tracking calculations scale proportionally across that specific velocity range.