VIBRO-METER GSI127 244-127-000-017-A2-B02

Core Technical Specifications

1. Isolation Performance: 4kV RMS galvanic isolation between sensor side and monitoring system side; 50V RMS isolation between power supply and signal output
2. Transfer Function (B02): 12mA sensor input current converts to 7VDC linear output voltage
3. Power Input: 18–30VDC industrial auxiliary power; consumption ≤120mA under full sensor load
4. Signal Compatibility: Fully compatible with Vibro-Meter CExxx IEPE accelerometers, IPC707 charge amplifiers, TQ9xx proximity probes
5. Output Drive Capacity: Max 10kΩ load resistance; short-circuit protected output circuit
6. Environmental Spec: Operating temperature -40°C ~ +85°C; humidity 5–95% non-condensing
7. Mounting Form: Standard 35mm DIN rail mount; removable screw terminal blocks for wiring
8. Physical Data: 110mm(W) × 75mm(H) × 32mm(D); net weight 120g

Function Features

• Ultra-high electrical isolation eliminates ground loop noise that distorts low-amplitude vibration measurement signals
• Built-in transient surge protection suppresses high-voltage spikes from motor switching and lightning grid interference
• Fixed linear transfer function for direct conversion of sensor current output to standard voltage monitoring signal
• Passive signal amplification without external power booster for long-distance sensor cable transmission (up to 800m)
• SIL safety certification eligible for turbine safety critical vibration protection loops
• Plug-and-play modular design for quick replacement without reconfiguring vibration monitoring system parameters
• Wide temperature tolerance for outdoor fan, hydro turbine, and offshore rotating equipment monitoring cabinets

Working Principle

1. Low-level current vibration signal from piezoelectric accelerometer enters the sensor-side isolated input cavity
2. Internal high-frequency transformer galvanically decouples sensor circuit and monitoring side circuit to break ground potential difference loops
3. Precision op-amp circuit executes fixed 12mA → 7V linear signal scaling per B02 transfer function coding
4. Isolated output voltage signal transmits to central vibration monitoring rack or PLC analog input module
5. Internal TVS transient diodes clamp overvoltage surges to protect sensitive measurement electronics from burnout
6. Isolated auxiliary power supply channel provides stable excitation current to remote IEPE vibration sensors

Material & Structural Characteristics

• DIN Rail Enclosure: Black flame-retardant PA66 plastic with anti-static surface treatment
• Isolation Transformer Core: High-permeability ferrite core wrapped with 4kV reinforced insulation film
• Terminal Blocks: Nickel-plated copper screw terminals with spring wire retention for vibration resistance
• Circuit PCB: Double-sided high-isolation FR4 board with separated sensor, power, and output signal zones
• Internal Potting: Non-conductive silicone potting compound filling to resist condensation and mechanical shock

Installation Requirements

1. Mount horizontally on DIN rail inside vibration monitoring cabinet; maintain 10mm clearance between adjacent isolation units
2. Sensor-side cable uses shielded twisted pair; shield grounded only at GSI127 input terminal (single-end grounding rule)
3. Separate sensor signal cables from high-voltage motor power cables by minimum 30cm distance
4. Auxiliary 24VDC power wiring fitted with 0.5A fast-blow fuse for circuit overload protection
5. Connect unit protective earth lug to cabinet low-impedance grounding bar

Usage Precautions

• Do not mix A-series and Ex-series GSI127 units in the same measurement chain without cross-verifying transfer function coding
• Avoid installation near high-current contactors, inverters, or large transformers generating strong electromagnetic fields
• Visually inspect silicone potting monthly for cracking if deployed in severe vibration turbine enclosures
• Never apply input signal current exceeding 15mA to prevent internal op-amp saturation and signal distortion
• Replace unit if output signal offset drifts more than ±0.5V full scale after zero calibration