Description
The Vibro-Meter GSI127 244-127-000-017 is a galvanic separation unit used in Vibro-Meter vibration measurement chains. It provides electrical isolation between the sensor side and monitoring side while also supplying compatible sensors or signal conditioners. The manufacturer identifies 244-127-000-017 as the ordering number for the GSI127 family.
The unit is designed for signal transmission and isolation in machinery vibration-monitoring systems. It supports current-output and voltage-output measurement chains, including compatible Vibro-Meter signal conditioners, charge amplifiers, velocity sensors, and industry-standard IEPE vibration sensors.
Key Features
- Vibro-Meter GSI127 galvanic separation unit
- Part number 244-127-000-017
- Electrical isolation between sensor and monitor sides
- 4 kVRMS sensor-to-monitor galvanic separation
- 50 VRMS power-supply-to-output isolation
- DIN-rail mounting
- Removable screw-terminal connectors
- Current-to-voltage signal transfer
- Voltage-to-voltage signal transfer
- Compatible with IEPE vibration sensors
- Suitable for hazardous-area measurement chains when the appropriate Ex version is selected
- Designed for machinery condition monitoring and protection
Product Datasheet
| Parameter | Specification |
|---|---|
| Brand | Vibro-Meter / Meggitt |
| Model | GSI127 |
| Part Number | 244-127-000-017 |
| Product Type | Galvanic Separation Unit |
| Application | Vibration Monitoring / Measurement Chain |
| Sensor-to-Monitor Isolation | 4 kVRMS |
| Power-to-Output Isolation | 50 VRMS |
| Transfer Functions | 0.5 V/mA, 1 V/mA, 3.2 V/mA, 1 V/V, −1 V/V ±1% |
| Output Offset | 0, 7, 8 or 10 VDC ±0.2 VDC |
| Frequency Range | DC to 20 kHz |
| Linearity | <0.2% |
| Operating Temperature | −20 to +70°C |
| Storage Temperature | −40 to +85°C |
| Operating Humidity | Up to 90% RH, non-condensing |
| Mounting | DIN rail TH 35-7.5 |
| Safety | SIL 2 suitable versions available |
| Hazardous Area | Ex versions available |
| Typical Dimensions | Approx. 117 × 114 × 22.5 mm |
The transfer functions, isolation ratings, temperature range, frequency response, and mechanical dimensions are documented in the GSI127 technical material.
Functional Description
The GSI127 sits between a vibration sensor or signal conditioner and the downstream monitoring equipment. Its main job is galvanic isolation, reducing the effect of ground/frame voltage and providing an electrically separated signal path.
Different GSI127 ordering configurations are available depending on the environment and signal-transfer requirement. For example, the B02 configuration uses a 1 V/mA transfer function with defined zero-current offsets for compatible IPCxxx and VE210 current-output devices. Other variants are intended for CExxx, IQSxxx, voltage-output devices, or constant-current IEPE sensors.
Compatible Measurement Chains
The GSI127 can be used with several Vibro-Meter measurement-chain configurations, including:
- CExxx piezoelectric accelerometers
- IPCxxx signal conditioners
- IQSxxx signal conditioners
- VE210 velocity sensors
- TQ-series proximity measurement chains
- Industry-standard IEPE vibration sensors
- Compatible charge amplifiers and sensor electronics
The exact GSI127 suffix should be matched to the sensor output type and required transfer function.
Typical Applications
- Gas turbine vibration monitoring
- Steam turbine monitoring
- Compressor condition monitoring
- Pump vibration monitoring
- Generator monitoring
- Large motor predictive maintenance
- Centrifuge monitoring
- Rolling mill equipment
- Oil and gas machinery
- Petrochemical process equipment
- Ship and railway machinery monitoring
Installation & Configuration
- Verify the complete ordering number 244-127-000-017.
- Check the A/B configuration suffix on the actual unit.
- Confirm the connected sensor or signal conditioner.
- Select the correct transfer function for the measurement chain.
- Mount the GSI127 on the appropriate DIN rail.
- Connect sensor-side wiring according to the approved diagram.
- Connect the monitor-side output.
- Verify the sensor supply requirements.
- Check galvanic isolation and grounding arrangements.
- Power up the measurement chain.
- Confirm the expected output signal.
- Perform a vibration-loop or signal simulation test.
Commissioning Checklist
- Confirm GSI127 model
- Verify 244-127-000-017
- Record complete A/B suffix
- Identify sensor type
- Confirm current or voltage output
- Verify transfer function
- Check terminal connections
- Verify sensor excitation
- Check monitor-side output
- Confirm isolation
- Test signal transmission
- Review vibration-monitoring system diagnostics
⚠️ Important Replacement Note
244-127-000-017 is the base ordering number, not necessarily the complete configuration. The GSI127 uses additional environment and sensitivity/zero codes. The manufacturer documentation lists standard and explosive-environment versions and several signal-transfer configurations.
For example:
| Configuration | Function |
|---|---|
| A1-B01 | 1 V/mA, 5 mA → 7 V |
| A1-B02 | 1 V/mA, current-output measurement chain |
| A1-B03 | 3.2 V/mA |
| A1-B04 | 1 V/V |
| A1-B05 | −1 V/V |
| A1-B21 | 1 V/V for industry-standard IEPE sensors |
The exact suffix should therefore be matched before replacing an installed unit
