"> PCB Piezotronics PCB-MAR-4ch 4-20mA
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PCB Piezotronics

PCB-MAR-4ch 4-20mA

PCB Piezotronics PCB-MAR-4ch 4-20mA is a shipboard unit in the Vibration Monitoring group, classified in the source as Vibration Monitoring System. It is normally installed on rotating machinery with sensors mounted at bearings, casings or shafts and processing units in local or central control cabinets. Its primary duty is to detect abnormal vibration and support condition monitoring of engines, turbines, pumps, compressors, gearboxes or shafts. In service it interfaces with accelerometers/proximity probes, tachometer references, signal conditioners, monitoring racks and the vessel automation/alarm system. Compared with neighboring entries in the same product family, this record is the exact PCB Piezotronics PCB-MAR-4ch 4-20mA variant; the model designation should be retained unchanged when matching onboard documentation and spares. For exact limits, settings, test values and approved maintenance criteria, refer to the manufacturer documentation for the exact figure.

Components & Design

Component data being added…

Technical Data

channels 4
measurement type velocity/acceleration
frequency range hz 1-20000
connectivity 4-20mA
portable or online portable

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Common failures & inspection points

Sensor or cable damage from heat, vibration or poor mounting, typically indicated by open-circuit/channel fault or erratic readings
Loose sensor mounting, typically indicated by unstable or artificially high vibration values
Signal conditioner/channel electronics fault, typically indicated by frozen values, channel alarms or loss of trend data
Reference/tachometer signal loss, typically indicated by missing phase/speed information or analysis errors
Configuration/calibration error, typically indicated by incorrect scaling or nuisance alarms

Service & Maintenance

Inspect sensor mounting and cabling, verify channel health, compare trends with machinery condition, check reference signals and confirm alarm interfaces; exact alarm limits must come from approved machinery/manufacturer data.

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Replacement Parts

Keep compatible sensors, extension cables, connectors, signal-conditioning modules and critical power supplies/interface cards.
Equipment Model #74226 · ✓ still in production