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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 244-127-000-017-A2-B02 |
| Transfer Function (B02) | 1 V/mA; 12 mA → 7 V, 13 mA → 8 V |
| Galvanic Isolation (Sensor to Monitor) | 4 kV RMS |
| Galvanic Isolation (Power to Output) | 50 V RMS (floating output) |
| Power Supply | 18–30 VDC (nominal 24 VDC) |
| Current Consumption | ≤80 mA (no load); ≤120 mA (20 mA sensor load) |
| Frequency Range | DC to 20 kHz |
| Linearity | <0.2% |
| Output Voltage Range | Typically 2–20 VDC (10 kΩ load) |
| Operating Temperature | 0 to 70 °C (32 to 158 °F) |
| Storage Temperature | −20 to +85 °C (−4 to 185 °F) |
| Mounting | DIN rail (TH 35) with removable screw terminals |
| Hazardous Area | Ex nA [ia Ga] IIC T4 Gc (ATEX/IECEx/cCSAus) |
4. Product Introduction
The Meggitt Vibro-Meter GSI127 244-127-000-017-A2-B02 is a galvanic separation unit that supplies power and isolates signals from current-output sensors or conditioners such as IPC70x charge amplifiers and VE210 velocity sensors. It converts the sensor-side current signal to a voltage output while providing 4 kV RMS isolation between the sensor side and the monitoring system.
This A2-B02 variant is certified for explosive atmospheres and uses the 1 V/mA transfer function matched to IPC and VE210 current chains. It rejects frame voltage noise and supports transmission distances up to 1 km in current mode. The unit mounts on standard DIN rail with removable screw terminals and requires no separate ground connection.
GSI127 244-127-000-017-A2-B02
GSI127 244-127-000-017-A2-B02
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No output voltage / dead unit | Missing or incorrect 24 VDC supply | ✅ High | Measure 18–30 VDC at power terminals with multimeter | Confirm supply voltage and polarity before replacing unit |
| Output stuck near 0 V or saturated high | Sensor open/short or wrong B-code match | ✅ High | Measure sensor-side current (expect ~12 mA idle for B02); verify transfer function matches existing chain | Confirm B02 is correct for your IPC/VE210; check sensor wiring |
| High noise or intermittent signal | Frame voltage or poor isolation | ✅ Medium | Check for ground loops; verify isolation with insulation tester if safe | Ensure floating output is maintained; do not bond sensor ground to monitor ground |
| ERR or diagnostic indication (if monitored) | Sensor-side overload or internal fault | ✅ High | Measure sensor current (should stay <26 mA); check for shorted transmission line | Remove sensor load; if unit still fails, replace |
| Unit powers but no AC vibration signal | Sensor or conditioner failure upstream | ❌ Low | Bypass GSI127 temporarily with direct short-distance test if safe | Issue is usually the sensor or IPC/IQS unit, not the GSI127 |
If diagnostics remain unclear, send clear photos of the terminal wiring, measured voltages/currents, and any diagnostic buffer data to technical support.
6. Frequently Asked Questions (FAQ)
Q: Is the 244-127-000-017-A2-B02 still available new, or has it been discontinued?
A: The 017 series is the older version. Meggitt introduced the fully compatible 244-127-000-021 as the form-fit-function replacement with SIL 2 capability and wider temperature range. Genuine 017 units are still available as new surplus from authorized channels, but stock is limited. Verify the exact A2-B02 configuration before ordering.
Q: Can I directly replace an existing GSI127 with this unit without changing wiring or software?
A: Yes for the same A2-B02 option. The pinout, mounting, and transfer function are identical. Always photograph the existing terminal connections and confirm the B-code matches your sensor chain (B02 is specifically for IPC current-output or VE210). Do not assume a different B-code will work.
Q: What happens if I use the wrong B-code (e.g., B01 or B03) on an IPC chain?
A: The zero offset and sensitivity will be wrong. You will get incorrect DC bias and scaled vibration amplitude. The monitoring system may show constant offsets or false alarms. Match the B-code exactly to the sensor/conditioner type.
Q: Does this unit support hot-swapping?
A: No. Power down the 24 VDC supply before connecting or disconnecting. Hot-plugging can damage the isolation barrier or the connected sensor electronics.
Q: Why is the secondary-market price lower than a new factory unit from Meggitt?
A: This is new original / new surplus stock of the previous-generation 017 series. It is fully functional and Ex-certified, but the current production version is the 021. Warranty on surplus units is typically 12 months from the seller; factory new carries the full OEM warranty.
Q: Can I use this with standard IEPE accelerometers?
A: Yes. The GSI127 supports industry-standard IEPE sensors in addition to Vibro-Meter IPC, IQS, CE, and VE chains. Confirm the transfer function and current draw stay within the unit’s ratings.
Q: What is the maximum cable length on the sensor side?
A: In current-transmission mode the GSI127 supports high-quality signal transmission up to approximately 1 km. Voltage mode is intended for shorter runs. Always follow the specific sensor installation manual for cable capacitance and resistance limits.
