Description

GSI127 A1‑B02 (244‑127‑000‑017) Galvanic Separation Unit

Technical Specifications

• Part Number: GSI127 A1‑B02 / 244‑127‑000‑017
• Brand: Vibro‑Meter (Meggitt)MOORE AUTO…
• Warranty: One Year
• Input Voltage: 24 VDC ±20 %; max 150 mA power draw from system supply
• Operating Temperature: ‑20 °C ~ +70 °C DIN‑rail cabinet mounting
• Storage Temperature: ‑40 °C ~ +85 °C
• Response Time: Frequency bandwidth DC‑20 kHz for high‑speed vibration / dynamic‑pressure signal transmission
• Protection Class: DIN‑rail TS35 mount; IP20 module housing; 4 kV RMS galvanic isolation between sensor side and monitor side
• Accuracy Class: Transfer function 1 V/mA; output offset 7 VDC; gain accuracy ±1 %
• Output Frequency: Passes high‑frequency AC dynamic sensor signals; no internal signal generation
• Rated Current Range: Sensor‑side supply up to 22 mA for field signal‑conditioners / pre‑amplifiers
• Communication Interface: Removable screw‑clamp terminal blocks for sensor‑field side and VM600 monitor‑side wiring; status LED indicators
• Supported Protocols: Signal interface for Vibro‑Meter VM600 machinery monitoring system; compatible with proximity probes, piezoelectric accelerometers, dynamic‑pressure sensors, IEPE sensors
• Overload Capacity: Floating isolated output; strong frame‑voltage ground‑noise suppression; transient‑voltage surge protection; no internal field‑side fuses
• Dimensions: 22.5 mm × 117 mm × 115 mm; weight approx 0.15 kg

Product Overview

The GSI127 A1‑B02 is a standard‑grade galvanic separation isolation module for Meggitt Vibro‑Meter VM600 machinery‑protection systems. It supplies power to field‑mounted pre‑amplifiers and sensors, provides high‑voltage galvanic isolation between noisy field‑sensor circuits and VM600 monitor rack electronics, converts current‑mode sensor signals into voltage‑mode signals, and rejects large ground‑loop frame‑voltage noise over long cable runs. A1‑B02 denotes standard non‑Ex environment version with 1 V/mA transfer characteristic and 7 V offset output.

This isolation unit addresses machinery‑monitoring challenges: elimination of ground‑loop interference in turbine‑compressor measurement chains, isolated power supply for remote sensor pre‑amplifiers, and drop‑in spare‑part compatibility for legacy VM600 retrofit & maintenance projects. Turbomachinery‑protection engineers, power‑plant and oil‑gas‑site maintenance technicians and retrofit integrators benefit most. It is widely deployed for radial‑vibration, casing‑vibration and dynamic‑pressure measurement loops on gas‑turbines, steam‑turbines and centrifugal‑compressors in refineries, compressor‑stations and power‑generation facilitiesMOORE AUTO….

Key Application Notes

• DIN‑rail mounted signal‑conditioning module; must wire between field sensors/pre‑amplifiers and VM600 monitor‑cards; cannot operate standalone
• A1 = standard non‑hazardous‑area version; B02 = gain setting 1 V/mA with 7 VDC offset; not for Ex‑hazardous zone wiring (use GSI127‑Ex variant instead)
• Provides 4 kV RMS isolation breaking ground‑loops caused by potential difference between field‑sensor ground and control‑system ground
• Supports proximity probes, IEPE accelerometers, dynamic‑pressure transducers and 4‑20 mA loop‑powered transmitters within specification limits
• Removable screw terminals allow module replacement without undoing field‑cable terminations
• Not hot‑swap: remove 24 VDC supply before module replacement
• Origin: Switzerland; OEM active production; common spare for VM600 machinery‑protection system maintenance projects