Configured for absolute casing vibration measurement in API 670 compliant machinery protection systems, the Bently Nevada 9200-01-01-01-00 (base model 9200) provides direct physical execution of seismic velocity transduction via a moving-coil mechanism.
Suffix Breakdown & Model Matrix
Code Segment
Definition
9200
Standard Temperature Two-Wire Velocity Seismoprobe
A01
Vertical Orientation (0 deg +/- 2.5 deg), 4.5 Hz Min Frequency
B01
Top Exit Connector
C01
Circular Base with 1/4-20 UNC Stud
D00
No Agency Approvals (Standard)
Hardware Specifications
Parameter
Specification
Model Brand
Bently Nevada (Baker Hughes)
Origin
United States
Weight
300 g (10.5 oz)
Dimensions
41 mm Dia x 102 mm Height (1.6 in x 4.0 in)
Operating Temp
-29 degC to +121 degC (-20 degF to +250 degF)
Power Consumption
Passive Device (Self-generated EMF)
Sensitivity
20 mV/mm/s (500 mV/in/s) +/- 5%
Frequency Response
4.5 Hz to 1000 Hz (+0, -3 dB)
Coil Resistance
1.25 kOhm +/- 5%
Max Lead Length
305 m (1000 ft)
Eddy-Current Probe Scaling and Rotor Dynamics
Integration with Bently Nevada 3300 or 3500 monitoring racks requires validation of gap voltage targets, typically maintained at -10 VDC for proximity probes sharing the same machinery train. The 9200 series provides raw velocity data essential for rotor dynamic analysis, specifically tracking 1X and 2X vibration vectors. Signal cross-talk suppression is achieved through shielded twisted pair cabling terminated with proper ground reference at the monitor input module.
Frequently Asked Questions
Q: What is the maximum lead wire length supported for signal transmission to the monitor?
A: The transducer supports lead wire lengths up to 305 meters (1000 feet) without significant signal degradation, provided the loop resistance remains within the monitor's input impedance specifications.
Q: Is this specific model (D00) approved for installation in hazardous locations?
A: No. The D00 suffix indicates no agency approvals. This unit is rated for standard, non-hazardous industrial environments only.
Q: How does the mounting torque affect the sensitivity of the C01 base?
A: Insufficient torque (< 5.6 N-m) can result in mechanical resonance and erroneous readings. Over-tightening can distort the aluminum housing. Maintain torque at 5.6 N-m (50 in-lb).
Field Installation Guidelines
Mount the transducer to a smooth, rigid surface perpendicular to the primary vibration axis. Ensure the 1/4-20 UNC stud engages a minimum of 5 full threads into the machine casing. For top-exit connectors (B01), route the cable away from high-voltage power lines to prevent electromagnetic interference. Terminate the shield drain wire at the monitor end only to avoid ground loops. Verify output polarity: Pin A goes positive relative to Pin B when the case moves toward the connector.
