Network Transformer Monitoring with the VaultSafe Transformer Monitor

Network transformers are located in underground vaults in cities throughout the world. Catastrophic failure of a network transformer can cause serious harm to the public…but installing an expensive multi-gas monitoring system is difficult to justify given the relatively low cost of the transformer.

The VaultSafe Transformer Monitor is a low cost solution that serves as an early warning sign of incipient faults developing in network transformers. It samples the headspace in each compartment of a network transformer using a single hydrogen sensor.

VaultSafe Features and Benefits


  • Simple installation utilizing existing access point on the transformer.
  • Monitor is magnetic-mountable for easy retrofit applications.
  • Ethernet, serial and analog outputs are available.
  • Hydrogen sensor is calibrated to be representative of dissolved gas in oil readings.
  • Optional magnetic-mount RTD is available for temperature monitoring.
  • Four form C relays with NO, NC and COM terminals are available.


  • Provides continuous monitoring of the transformers main tank, switch compartment and cable compartment
    using only one sensor.
  • Monitors hydrogen gas and pressure in all transformer compartments which provides early detection of
    problems and greatly reduces the potential for failure
  • Monitor is maintenance free and self-calibrating.
  • Mitigates excessive pressure and vacuum conditions by equalizing pressure between all compartments
    using the unique design of the headspace adapters and manifold system.
  • Pressure is monitored across all three compartments preventing moisture or atmosphere ingress.
  • Monitor is completely submersible.