Accessories for smart transformers - eDevices

Temperature indicators for smart transformers

Winding and liquid temperature are key health parameters in the transformer. You need to monitor and control the temperature variations to assure reliable and safe transformer operation.

Choose one of our liquid and winding temperature indicators type eOTI/eWTI, an evolution of our conventional temperature indicators, and continuously monitor the liquid & winding temperature. It will allow you to keep any unexpected temperature rise that may lead to a transformer failure under control. Our accessories fit all transformer designs. Personalize the value settings for alarms and switches to fit your specific needs. The operator can monitor the preset values remotely or check the values on-site through the easy-to-read dial and decide on the best transformer maintenance schedule.

The indicators are equipped with a digital interface for easy connection to smart grid applications and can be integrated into a system through a central control unit. They are compatible with our complete eDevice family, can be connected also to third-party devices, and be part of our modular monitoring ecosystem for transformer diagnostics – MeDICA.

Contact us and get support with the product selection.

Why buy

  • Proven technology with robust design
  • Continuous online monitoring enables the end-users to adopt a condition-based maintenance approach and driving asset health management remotely
  • Visual indicator enables easy on-site control of the operating status to the transformer operators
  • Accurate and stable measurement based on proven and reliable Bourdon working principle
  • Customizable mounting flange to fit all transformer designs
  • Adjustable value settings for alarms and switches
  • Easy installation
  • Maintenance-free


  • Smart grid applications
  • Liquid-filled transformers
  • Suitable for new installations and retrofits
  • Suitable for offshore environment
  • Suitable for tropical climates
  • Part of our MeDICA solution

Technical data at a glance

StandardIEC 60076-22-1 and JB/T 6302-2005
HousingAll the external parts are resistant to oils, salt fog and UV rays
InstallationIndoor, outdoor and Tropical proof
Capillary and bulbCapillary tube: copper or stainless steel
Bulb: bronze or stainles steel
Capillary tube protectionCopper tube Flexible AISI 304 stainless steel amouring or Rilsan
LensPolycarbonate, multistrate glass or tempered glass
Ambient temperatureFrom -40°C up to +70°C
Degree of protectionIP66
Ventilation valve2; to prevent the formation of condensation
Cable glandUp to 3; M25x1.5
Micro switchesUp to 4
Supply voltage24 V dc ±10% polarized
Power consumption0,5 W
Measuring rangeeWTI: 0°C/+150°C; 0°C/+160°C; 0°C/+180°C; -50°C/+150°C
eOTI: -50°C/+150°C; -20°C/+130°C; -20°C/+140°C; 0°C/+120°C; 0°C/+150°C; 0°C/+160°C
Measuring tolerance1.5% of full scale
Accuracy switch1.5% of full scale
Analog output4-20 mA
Digital outputModbus RTU
Data logger

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