IPC704 244-704-000-042

FAQS

• What is vibro-meter IPC704?
  It is a configurable Meggitt signal conditioner/charge converter for CA piezoelectric accelerometers and CP piezoelectric dynamic-pressure sensors.
• Is 244-704-000-042 a complete IPC704 ordering number?
  No. Official Meggitt examples append A-I option codes; the base number alone does not identify one complete electrical configuration.
• What signal enters the IPC704?
  A charge-based signal from the selected CA accelerometer or CP dynamic-pressure sensor enters through the approved low-noise sensor cable.
• What output does IPC704 provide?
  Depending on the ordered configuration, it provides a current-modulated two-wire or voltage-modulated three-wire analogue output.
• What frequency range does the IPC704 family cover?
  Meggitt's official sensor-system brochure states configurable high-pass and low-pass filters across 0.5 Hz to 20 kHz; the actual ordered limits require the full option code.
• Can IPC704 produce velocity output?
  An optional integrator can provide a velocity-related output, but its presence and scaling cannot be confirmed from the incomplete base P/N.
• Which sensors can be used?
  Meggitt documents CA piezoelectric accelerometers and CP piezoelectric dynamic-pressure sensors; the exact sensor model, sensitivity and cable must match the full IPC704 configuration.
• Can it transmit over a long distance?
  Meggitt documents current-output, two-wire IPC704 chains with a GSI127 galvanic-separation unit for high-quality long-distance signal transmission.
• Why must the IPC704 housing be insulated from ground?
  The manufacturer states that its conductive housing is connected to COM, so isolation from ground is required to eliminate earth loops and help ensure correct measurements.
• Is every IPC704 suitable for a hazardous area?
  No. Standard and Ex versions were configuration choices made at ordering; use requires the full P/N, nameplate approval and exact hazardous-area installation design.
• What replaced IPC704?
  Meggitt announced IPC707 as the fully backward-compatible replacement in January 2019, but the complete IPC704 option code is still required for correct conversion.
• Does IPC704 make alarm or trip decisions?
  No. It conditions and transmits the measurement signal; the external machinery protection/monitoring system performs measurements, alarms, trips and diagnostics according to its configuration.
• Which applications are officially documented?
  Meggitt application flyers document bearing absolute vibration, combustion-chamber casing vibration and combustor dynamic-pressure chains on several gas-turbine models, using different complete IPC704 configurations.
• What must be checked before replacement?
  Verify the full A-I code, sensor and cable, current/voltage output, transfer sensitivity and units, filters, integrator, power, grounding, Ex approvals, housing, GSI127 and receiving-monitor channel scaling.