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Calisto 5

Oil standards

5 Fault Gases - Moisture

Avoid what could become a costly transformer failure by choosing our new generation of multi-gas on-line monitors. The Calisto 5 is a powerful tool for transformer condition assessment.

This generation of Calistos uses gas chromatography with proven reliable results.
This is a physical method of separation in which the components to be separated are distributed between two phases, one of which is stationary (stationary phase) while the other moves in a definite direction (mobile phase).


  • Identify arcing at the earliest onset
  • Add continuous Duval Triangle diagnosis to incipient fault detection
  • Ensure concurrence with laboratory data (short-term and long-term)
  • View data and monitor status on-site without tools or computers
  • Low ownership cost


  • Additional measurement of Duval Triangle gases
  • Acetylene measurement from 0.2 ppm
  • Automated self-calibration using certified primary grade gas
  • Intuitive front-panel display interface
  • Built-in oil circulation and flow monitoring
  • Continuous enclosure and oil conditioning
  • Communication protocols: DNP3, Modbus, IEC 61850 (optional)
  • Vacuum tolerant
  • Substation hardened communication electronics
  • Built-in moisture and solubility coefficients for all common insulating fluids


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Calisto 5 / Calisto 9 Technical Specifications - English