Temperature Measurement Products

Luxtron ThermAsset2

Effective Fiber Optic Hot Spot Monitor and Controller for Power Transformers

Advanced Energy's Luxtron ThermAsset2 is designed to measure transformer winding hot spots in real time and activate control of the cooling system.

  • Choice of two, four, six, or eight channels
  • Direct, accurate, and real-time transformer winding hot spot and temperature monitoring
  • Programmable setpoints and relays with individual LED alarm indicators
  • Overview
  • Technical Specs
  • Documents
  • Accessories
  • Service & Support
  • Distributors


The Luxtron® ThermAsset®2 controller is designed to measure transformer winding hot spots in real time and activate control of the cooling system. This allows for optimum operation of the transformer at safe load capacity during overload conditions.

The ThermAsset2 controller offers many of the reliable and proven features considered the standard for fiber optic temperature measurement of transformer windings in the power utility industry. The same-patented Fluoroptic® thermometer (FOT) technology is employed using a lifetime LED light source to activate the sensors. The ThermAsset2 utilizes Luxtron ruggedized probes, the toughest in the industry, which require no calibration over the life time of the transformer.


  • Protect against overloading
  • Activate cooling systems using actual winding hot spot temperatures
  • Utilize drift-free, calibration-free industry-leading ruggedized probes
  • Retain up to 300 days of data at 1-minute intervals on all channels
  • Leverage alarm status indicators for up to six customer-specific relay functions


  • Probes based on Fluoroptic technology which is immune to electromagnetic interference and high voltage
  • Direct, real-time, and accurate measurement of transformer winding
  • Probes require no calibration over the life time of the transformer
  • Available with up to 8 channels
  • Optional tank wall adapter plate with feedthroughs
  • Performance


    2, 4, 6, or 8

    Temperature Range

    -30 to 200°C (-22 to 392°F)




    All ring-lug terminals


    Accepts all Luxtron Quality and DipTip rugged probes

    LED Alarm Indicators

    One for each relay

    System Fault Status Indicator

    2 LEDs: green = OK, red = faulty condition

  • Environmental Specifications

    Operating Temperature Range

    -40 to 70°C (-40 to 158°F)

    Storage Temperature Range

    -30 to 75°C (-22 to 167°F)

  • Communication

    Serial Output

    RS232 and RS485


    Modbus and DNP3 options available

    Number of Relays

    6 form-C programmable cooling control and alarm setpoints either factory programmed or via RS232 and RS482 from computer

    Temperature Data Storage

    Retains 300 days of data at 1 minute intervals on all channels and maximum temperature for each channel retained until reset by user

    Front Panel Display

    Large 1" LED for each channel

    Probe Signal Strength Readout

    Single push button accessible for all channels

  • Electrical

    Input Power

    Universal AC/DC (90-265 VAC/DC)

    Analog Output

    4 to 20 mA or 0 to 1 mA

    Surge Protection

    3000V (IEEE C37.90.1-1989)

  • Typical Applications

    • Winding hot spot monitoring

Specifications are subject to change without notice. Not all options and accessories are available for all models and configurations. Dimensions listed generally refer to standard configurations and module bodies only. Please confirm technical specifications and customizations with a sales representative. Advanced Energy is not responsible for errors or omissions.



Luxtron Fiber Optic Probes

Patented Fluoroptic Probes that are Chemically Resistant and Immune to Electromagnetic Interference

Tank Wall Plates

Luxtron Tank Wall Plate

ThermAsset2 Tank Wall Plate - Bolted or Welded Design

Global Support & Services

Maximize fab productivity and capital equipment ROI with world-class support through each product lifecycle stage — from startup to long-term operation. Our service offerings are based on more than three decades of precision power and applications expertise.

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Product Support

U.S.: +1 800 446 9167
Asia: +86 29 8874 1895
China: 400 8899 130
EMEA: +44 800 032 1546
U.K.: 08000 321 546

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