Technical & Performance Specifications
- Matched Exclusive Probe Type: Short-tip PR6422 micro eddy current probes
- Fixed Linear Measurement Air Gap: 0 mm – 4 mm
- Frequency Response Bandwidth (-3dB): 0 Hz ~ 20 kHz
- Signal Rise Time: <15 μs
- Input Power Supply: -24 V DC nominal, operating range -23 V DC ~ -32 V DC
- Analog Output Signal: -4 V DC ~ -20 V DC linear proportional voltage
- Full Scale Linearity Error: ≤0.25% FS
- Vibration Resistance Rating: 5 g continuous sine vibration 10 Hz–2 kHz
- Operating Ambient Temperature: -30°C ~ +100°C
- Protection Rating: IP20 indoor cabinet use only
- Unit Weight: 120 g
- Terminal Maximum Wire Gauge: 1.5 mm² copper wire
- Probe Connection: LEMO self-locking circular plug
- Certifications: CE, ATEX IECEx, CSA safety certification
Function Features
- Ultra-precise factory narrow-range linearity calibration optimized for 0–4 mm small shaft-probe clearance
- High 20 kHz full bandwidth captures ultra-high speed bearing defect vibration signatures
- Real-time open probe, short cable fault detection with output voltage clamping for safety interlock
- Full galvanic isolation between probe input and analog output to eliminate ground loop interference
- Compact lightweight housing supports dense multi-channel rack mounting for multi-point precision shaft monitoring
- Negative DC power architecture fully compatible with standard industrial machinery protection rack power distribution
Working Principle
Internal high-frequency precision oscillator generates stable excitation signal to paired short-tip micro eddy current probe. The probe induces tiny eddy currents on small-diameter high-speed rotating shafts; reflected electromagnetic field strength varies sharply within the 0–4 mm calibrated air gap window. High-resolution demodulation circuit extracts displacement signal, applies dedicated 916-160 factory linearity correction parameters, then outputs standardized -4 V ~ -20 V analog voltage representing exact shaft clearance to upper monitoring and protection modules.
Material & Structural Composition
- Housing: LMgSi lightweight die-cast aluminum alloy with integrated heat sink ribs
- Main Circuit Board: Multi-layer FR4 low-drift precision PCB with temperature-compensated calibration resistors unique to 916-160 model
- Connectors: Nickel-plated LEMO circular probe connector; tin-plated copper screw terminal blocks for power and signal wiring
- Internal Thermal Structure: Bonded aluminum heat sink attached to oscillator circuit core for high-temperature ambient heat dissipation
Advantage Highlights
- Narrow calibrated air gap delivers maximum displacement resolution for micro high-speed shafts
- Ultra-low linearity error ensures high precision measurement for critical turbine safety protection systems
- 20 kHz full bandwidth meets high-speed rotor vibration frequency capture requirements
- ATEX hazardous area certification allows deployment inside chemical, power generation classified cabinets
- Compact footprint enables dense multi-channel layout on machinery monitoring racks
- Pre-custom factory calibration eliminates on-site linearity adjustment steps during field commissioning
Applicable Industries
Micro gas turbine test benches, high-speed generator spindle monitoring, turbocharger test equipment, precision aerospace turbomachinery, small high-speed centrifugal compressors
Installation Requirements
- Mounting Options: Direct panel mounting via M5 screws or 35 mm DIN rail with matching adapter bracket
- Probe Cable Standard: Double-shielded PTFE eddy current dedicated cable, single-point grounding only at converter LEMO connector
- Power Wiring: Twisted shielded pair cable for -24 V DC supply, separate routing away from high-current power lines
- Cabinet Spacing: Minimum 10 mm gap between adjacent converters to avoid mutual thermal interference
Operation & Maintenance Notes
- Model 916-160 converter can only pair with designated short-tip PR6422 probes; mismatched probes cause permanent measurement deviation
- Annual precision calibration with certified 0–4 mm air gap test fixture mandatory to retain measurement accuracy
- Probe wiring must maintain minimum 10 cm separation distance from VFD high-current power cables
- LEMO connector locking mechanism inspection required every 12 months to prevent vibration-induced loose contact
- Ambient cabinet temperature exceeding +100°C activates thermal protection and disables valid measurement output
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