Multi-Channel Monitor and Controller for Distribution Transformer Applications

The LumaSHIELD® is a multi-channel signal conditioner compatible with any of LumaSense’s GaAs-based fiber optic temperature sensors. At the heart of the LumaSHIELD® is the LumaSense Semiconductor Band Gap (SCBG) technology which performs measurements using the temperature-dependent bandgap shift of a Gallium Arsenide (GaAs) crystal.

LumaSHIELD<sup>®</sup> Front View

Key Features

  • Up to 16 measurement channels
  • Total system accuracy (± 0.8 °C)
  • Internal reference to guarantee reliability
  • No drift, no calibration required
  • IEC 61850 compliant
  • Light source lasts the life of the transformer
  • Local and remote data acquisition
  • RS-232, RS-485 and Ethernet1 output with SCPI, ModBus, DNP3 protocols
  • Relays and analog output options available
  • LCD display with user-definable description for each optical channel
  • Use with LumaSense Gallium Arsenide (GaAs) Semiconductor Band Gap (SCBG) fiber optic temperature sensors


The LumaSHIELD, designed for Smart Grid integration, is fitted with an internal reference that allows regular self-verification and correction of its fully traceable calibration. The internal reference provides long- term accuracy in the adverse conditions encountered in a distribution transformer environment, such as temperature variations, component aging, mechanical shocks and transformer vibrations.

The LumaSHIELD is equipped with a simple LCD display. Communication options include IEC61850/Ethernet¹, DNP3/Ethernet¹, SCPI and Modbus over RS-232 or RS-485 interface. SPDT-type relays and analog outputs (one per optical channel) are optionally available. A PLC controller is also available to offer extended control capabilities through a wide range of input/outputs.

The LumaSHIELD has a channel sampling rate of 50 Hz. It is used with standard 62.5/125 micron optical fiber temperature sensors (The LumaSense OTG-T /OTG-TC2 sensors). It also has the ability to read Neoptix, Fiso and Nortech fiber optics. A version is available for 200/230 micron optical fiber sensor models, as well.

¹Ethernet for IEC61850 or DNP3 communication

Typical Applications

  • Distribution Transformers and Small Power Tranformers
  • Smart Grid Temperature Monitoring
  • EMI, RFI and Microwave Environments
  • Nuclear and Hazardous EnvironmentsMulti-point long-term monitoring


The Best-in-Class GaAs-Based Solution for Winding Hot Spots

The Best-in-Class GaAs-Based Solution for Winding Hot Spots


Technical Data



Number of Channels

3 up to 16

Temperature Range -40 to +230°C (other ranges available upon request)
Accuracy ± 0.8°C (Total system accuracy at typical transformer temperatures including signal conditioner and sensor errors)

Response Time

0.5 s Typical

Measurement Resolution 0.1ºC
Light Source Life Span Life of the transformer
EMI/RFI Susceptibility Complete immunity
Display LCD screen display standard
Probe Signal Strength Readout User-definable description for each optical channel
Calibration Fully Traceable
Environmental Specifications
Operating Temperature -40 to +75 °C
Operating Humidity 0 to 100% non condensing
Analog Output

4-20 mA or 0-1 mA

Serial Output RS-232 and RS-485 standard, Ethernet optional


6 C-Form SPDT relays, 5 A @ 250 VAC or 30 VDC, 6 relay status indicators


SCPI and Modbus standard, DNP3 and IEC61850 optional

Probes OTG-T, OTG-T+ and OTG-A fiber optic sensors

T° Data Storage

> 2,000,000 temperature measurement points

Input Power 12 to 24 VDC
Surge Protection 3000V (1EEE C37.90.1-2002)
Consumption 2.5 W typical

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