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Keterangan
Bently Nevada 177230 Seismic Velocity Transmitter
Configured for casing vibration monitoring in machinery protection networks, the Bently Nevada 177230-00-02-05 (177230 Series Seismic Velocity Transmitter) provides direct physical execution of velocity measurement via a 2‑wire, loop‑powered 4‑20 mA current interface to PLC, DCS, or SCADA systems without waveform output capability.
Hardware Specifications
Parameter
Specification
Model Brand
Bently Nevada 177230-00-02-05
Origin
USA
Weight
Approx. 0.35 kg
Dimensions
75 mm dia × 95 mm length
Operating Temp
-40 degC to +85 degC
Power Consumption
< 22 mA @ 24 VDC loop power
Output Signal
4‑20 mA DC proportional to velocity
Measurement Range
0 to 2 in/s peak
Frequency Response
10 Hz to 1 kHz ±3 dB
Excitation Voltage
12 to 30 VDC
Velocity Sensitivity
±10% factory calibrated
Axis Orientation
Omnidirectional
Enclosure Rating
IP66 / IP67
Case Material
316L stainless steel
Connector Type
3‑pin MIL‑C‑5015 top connector
Mounting Thread
1/2‑20 UNF stud mount
Hazardous Area Approval
ATEX, IECEx, CSA/US/C (Class I Div 2 / Zone 2)
Eddy‑Current Probe Scaling and Gap Voltage Validation
In TSI architectures, the 177230 integrates with eddy‑current probe scaling factors defined by probe sensitivity (typically 7.87 mV/μm or 200 mV/mil). Gap voltage validation targets a nominal -10 VDC bias under static mounting conditions to ensure linear displacement measurement and prevent probe‑to‑shaft contact. Cross‑talk suppression is achieved via shielded twisted pair cabling and single‑point grounding at the termination panel to reduce capacitive coupling from adjacent sensor loops.
Frequently Asked Questions
Q: Can the 177230 transmit raw vibration waveform data?
A: No. The device outputs only a scaled 4‑20 mA analog signal representing overall velocity amplitude; no time‑waveform or FFT data are available.
Q: Is hot‑swap supported during live system operation?
A: No. Loop power must be de‑energized before removal or installation to prevent transient overcurrent in the process control loop.
Q: What is the minimum cable shielding requirement?
A: Use braided shield cable rated ≥85% coverage, grounded at one end only to the system earth bus.
Field Installation Guidelines
Mount the transmitter using the 1/2‑20 UNF stud directly to a clean, flat, vibration‑accessible surface on the machine casing. Apply thread-locking compound to prevent loosening under cyclic loading. Route the 2‑wire loop cable separately from high‑voltage conductors, maintaining at least 300 mm separation. Terminate shield at the PLC/DCS input terminal block only; do not connect shield at the sensor end. Verify loop continuity and current output at zero and full scale before commissioning.
