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INSULOGIX-T3 Multichannel DIN Rail Mount FO Temperature Sensor Signal Conditioner for Transformer Hotspot Monitoring



Multichannel DIN Rail or Chassis Mount Signal Conditioner for Transformer and other Health Monitor Applications

The Weidmann modular INSULOGIX-T3 is the 3rd Generation multichannel transformer winding hot spot monitoring system for utility level transformer and reactor health monitoring. The INSULOGIX ® T provides monitoring capabilities which directly reduce the risk of transformer failure. It offers reliable fiber optic hot spot temperature monitoring, with the option to measure up to sixteen temperature points. Once installed, the InsuLogix® T continuously monitors winding temperatures, with no action required by the operators.

The measurement principle is based on the inherent optical properties of gallium arsenide (GaAs) with temperature. The TS Trafo temperature sensors and Winding Smart Spacers provide a turn-key solution for internal transformer mounting of sensors.

The fiber optic thermometer INSULOGIX-T3 is available with up to 16 measurement channels based on 4-Channel Modules. For connection into SCADA systems, the product overs options for either RS485/ModbusRTU or Ethernet/ModbusTCP interface. Every channel includes a 4-20mA output as well as  programmable control relay. Software support is available for interfacing into your network environment.


Number of Channels 4, 8, 12 or 16 Note: USB interface can only access up to 8 channels. Modbus can access all channels.
Power Supply 24 VDC, Max 40 W
Measuring Range

-200°C to +300°C NOTE: Actual measurement range depends on calibration option chosen and temperature range of selected TS sensor:
A2-Calibration= -40°C to +200°C, B-Calibration= -40°C to +300°C, C-Calibration= -200°C to +300°C

Accuracy Factory Calibration: < ±1°C
Resolution 0.1°C
Measuring Time per Channel 250 ms per active channel (1 sec update rate for 4 channels, 2 sec update rate for 8 channels, etc.) NOTE: Disable unused channels using supplied FOTEMP-Assistant software
Analog Output 4-20mA, 14-bit resolution, one per channel
Relays Contact Rating: 5A at 240 V AC or 0.3A /240V DC or 8A/24V DC, one per channel.
Interfaces Standard, both RS485/ModbusRTU and Ethernet/ModbusTCP built-in.
Protocol Modbus protocol, Protocol information available for custom programming applications.
Data logging USB interface supports ASCII protocol and compatible with supplied FOTEMP-Assistant data logging software. Output files are Excel compatible.
Optical Interface ST, compatible with all TS series fiber optic temperature probes
Temperature -20°C to +70°C
Dimensions/Weight 248 x 203.7 x 154.55 mm, 1.9 kg
Materials Aluminum housing
Mounting DIN Rail or Chassis Mount
Warranty 5 years
Calibration Interval Under normal use, the instrument does not require recalibration. When sensors and cables are changed, a One-Point Calibration is required. Recommended calibration interval is 24 months for ISO quality systems.

Specifications subject to change without notice


  • Robust & durable metal housing
  • Up to 16 measuring channels
  • Measuring range: -200°C to +300°C
  • High accuracy: ±0.2°C
  • LCD display
  • 4-20mA analog outputs
  • 4 control relays
  • USB plus Modbus (choice of RS485 or Ethernet)
  • Includes FOTEMP-ASSISTANT configuration and data logging software for PC-based USB applications


  • EMI, RFI and microwave environments
  • High voltage environments
  • Oil-filled transformer monitoring
  • Process monitoring
  • MRI and other low/high magnetic field applications


Call +1-805-389-6600 or email

Ordering Information

INSULOGIX-T3-X-Y-Z Fiber Optic Hot SPOT Temperature Monitor, where
X=No. of Channels: 4, 8, 12 or 16 channels
Y=Interface: P0=RS485/ModbusRTU + Ethernet/ModbusTCP
=Calibration Option: A2=Standard= -40°C to +200°C; B=HighTemp= -40°C to +300°C; C=Extended= -200°C to +300°C

Recommended Ordering Configurations

INSULOGIX-T3-8-P0-A 8 Channels, ModbusRTU+ModbusTCP, A2-Calibration= -40°C to +200°C
INSULOGIX-T3-12-P0-A 12 Channels, ModbusRTU+ModbusTCP, A2-Calibration= -40°C to +200°C
INSULOGIX-T3-16-P0-A 16 Channels, ModbusRTU+ModbusTCP, A2-Calibration= -40°C to +200°C
TS3 Sensors, General Purpose TS3-10MM-02 or TS3-10MM-06
TST Sensors (for use with SmartSpacer) TST2J-XX  for use with J-Spacer, TST2D-XX for use with Disk, where XX=Overall Sensor Length in meters, max length=20m
FO Extension Cables (length in meters) DIST-C900-03 or -05 or -10
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