Product Short Description
Product Overview
VM-701BNB1TRPTB1 is a 4-channel rack-mount machinery monitoring module manufactured by Shinkawa (Vibro-Meter cooperative series), dedicated to continuous measurement of shaft relative vibration, thrust bearing axial displacement and rotor thermal expansion for steam turbines and centrifugal compressors. Model suffix breakdown: NB1 = non-incendive hazardous area certification; TRP = tropicalized high-humidity conformal coating circuit board; TB1 = heavy-duty screw terminal transducer interface. The module provides real-time analog output and threshold alarm relay signals compliant with API 670 standard for heavy process industry rotating equipment safety protection.
Description
Core Technical Specifications
- Input Channel Count: 4 independent eddy-current proximity probe input channels
- Measuring Parameters: Shaft radial vibration, thrust axial displacement, rotor differential expansion, bearing eccentricity
- Probe Excitation: -24 VDC constant current excitation for standard eddy current transducers
- Frequency Bandwidth: 10 Hz ~ 10 kHz adjustable high/low pass digital filtering
- Alarm Thresholds: Dual-stage programmable warning and trip limits per channel
- Output Signals: 0~10 VDC analog raw signal output, SPST alarm dry contact relays
- Certification Grade: NB1 non-incendive, Class I Division 2 hazardous gas zone approved
- Environmental Rating: TRP tropicalized coating, operating humidity 5%~98% non-condensing, -20°C ~ +70°C
- Communication Interface: Front-panel USB local configuration, RJ45 Ethernet remote Modbus TCP data upload
- Mounting Form: 19-inch standard rack 3U height, hot-swap pluggable
- Transducer Terminal: TB1 heavy-duty 15-pin screw terminal block, anti-vibration locking structure
- Measurement Accuracy: ±0.2% full scale linearity error
Functional Features
- Four fully isolated eddy-current input channels supporting all standard shaft displacement proximity probe brands
- Tropicalized PCB conformal coating prevents circuit corrosion in coastal high-salt, high-humidity tropical plant environments
- NB1 non-incendive circuit design allows direct installation inside Division 2 hazardous control cabinets without explosion-proof enclosures
- Front-panel USB port for offline parameter configuration and waveform data storage without host system connection
- Built-in digital band-pass filters customizable for low-speed turbine and high-speed compressor measurement requirements
- Per-channel front panel LED indicators for OK status, warning alarm and trip fault conditions
- Hot-swap capability; module replacement without entire monitoring rack power shutdown
- Real-time Ethernet Modbus TCP communication to plant DCS/SCADA for remote condition data visualization
Working Principle
Module internal power circuit supplies constant negative excitation current to eddy-current proximity probes mounted near rotating shafts. Probe generates alternating magnetic field; metal shaft surface induces eddy current, altering probe coil impedance proportional to shaft-probe clearance distance. VM-701BNB1TRPTB1 signal conditioning circuit converts impedance variation into linear voltage signal, digital DSP chip filters and calculates peak-to-peak vibration displacement, axial thrust position and expansion value. Internal comparator compares measured value against programmed warning/trip thresholds, driving relay contact actuation for external interlock circuits while outputting standardized analog signals to DCS acquisition cards.
Material & Structural Characteristics
- Circuit Substrate: FR4 PCB with polyurethane tropicalization conformal coating (TRP variant anti-mold, anti-salt spray)
- Front Panel: Die-cast aluminum alloy, corrosion-resistant powder coating
- Transducer Terminals: TB1 brass screw terminals with spring locking washers, flame-retardant PA plastic housing
- Internal Relay: Sealed industrial low-signal relay for alarm contact output
- Rack Connector: Gold-plated edge connector with vibration-resistant spring contact strips
- Housing Sealing: IP54 front panel dust/water splash protection for cabinet installation
Installation Requirements
- Install into standard 19-inch control rack with minimum 2U vertical clearance above/below module for air convection cooling
- All proximity probe coaxial cables must be double-shielded; connect outer cable shield single-end to VM-701 rack chassis ground
- In Division 2 hazardous cabinets, maintain minimum 30 mm clearance between module and high-power frequency converter drives
- Ground rack chassis with 6 mm² copper earth braid connected to plant unified protective earth grid
- Front-panel USB port must be covered with factory rubber dust cap during permanent operation to avoid humidity ingress
- Ethernet communication cable routed separately from transducer coaxial signal cables with ≥15 cm separation distance
Application Scenarios
- Coastal petrochemical plant high-humidity tropical area centrifugal compressors shaft vibration monitoring
- Refinery Class I Division 2 hazardous gas zone steam turbine thrust bearing displacement protection
- Sugar mill, paper mill tropical factory large steam turbine rotor expansion measurement
- Offshore platform gas turbine non-incendive cabinet machinery condition monitoring
- Fertilizer plant ammonia compressor shaft eccentricity and bearing fault early warning
Operation & Maintenance Precautions
- Do not operate module without TRP dust cap installed on front panel USB interface in high-humidity environments
- Conduct annual cleaning of PCB conformal coating inspection in salt-spray coastal sites; re-coat if coating peeling occurs
- Probe coaxial cable joints must use sealed BNC connectors; exposed wiring leads to signal drift and measurement error
- Avoid mounting rack adjacent to cooling water pipework; condensation dripping causes internal circuit short-circuit
- Re-calibrate channel linearity every 12 months using standard eddy current calibration test rig
- Disconnect Ethernet communication cable before performing hot-swap module replacement to prevent backplane bus surge damage
Reviews
There are no reviews yet.