Configured for absolute vibration measurement in Turbine Supervisory Instrumentation (TSI) networks, the Bently Nevada 9200-06-02-01-00 (base model 9200 Velocity Seismoprobe) provides direct electromechanical signal generation without external excitation power.
Body Diameter: 31.8 mm (1.25 in); Height: 63.5 mm (2.5 in)
Operating Temp
-29 degC to +121 degC (-20 degF to +250 degF)
Power Consumption
N/A (Self-generating, passive device)
Sensitivity
20 mV/mm/s (500 mV/in/s) +/- 5%
Freq Response
10 Hz to 1 kHz (+0, -3 dB)
Velocity Range
0 to 25 mm/s peak
Coil Resistance
1.25 kOhm +/- 5%
Output Signal
Analog Voltage (AC)
Eddy-Current Probe Scaling and Gap Validation
The 9200 series interfaces directly with Bently Nevada 3300 and 3500 monitor racks. Calibration requires strict adherence to the 500 mV/in/s scale factor. Unlike proximity probes, this seismoprobe measures absolute casing motion relative to free space. When integrating with TSI logic solvers, ensure the monitor channel is configured for "Velocity" input type, not "Proximity". Cross-talk suppression is achieved via shielded twisted pair cabling, maintaining separation from AC power conductors by a minimum of 300 mm to prevent ground loop induction on the 1.25 kOhm coil circuit.
Frequently Asked Questions
Q: Does the 9200-06-02-01-00 require loop power from the monitoring system?
A: No. This is a passive, moving-coil transducer. It generates its own voltage signal based on the velocity of the vibration; no external DC power is required.
Q: What is the termination requirement for the 74712 series cable?
A: The transducer must be terminated with the correct impedance matching connector or terminal block as specified in the 3300/3500 rack documentation to maintain the +/- 5% sensitivity tolerance.
Q: Can this unit measure displacement directly?
A: No. The output is velocity. To obtain displacement (peak-to-peak), a Velocity-to-Displacement Converter (VDC) module or integration function within the monitor card must be utilized.
Field Installation Guidelines
Mounting Torque: Secure the transducer using the 1/4-20 UNC stud. Apply a torque of 1.7 N-m (15 in-lb) to ensure rigid mechanical coupling to the bearing housing.
Connector Engagement: Use the side-exit connector. Ensure the coupling nut is fully seated and hand-tightened to prevent moisture ingress into the coil assembly.
Grounding: Terminate the cable shield drain wire at the monitor end only. Do not ground the shield at the transducer body to avoid creating ground loops.
Orientation: Verify the mounting angle aligns with the primary vibration axis of the machine. The 9200-06 suffix allows for 0 deg orientation; misalignment will reduce the effective sensitivity.
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