Float Glass model

Model FG - Fibroptic Float Glass Temperature Measurement SystemThe Land Fibroptic Model FG (Float Glass) radiation thermometer is a fibre optics based 2-wire temperature sensor which has been specifically designed to solve measurement problems and improve control of process temperatures in the float glass industry. Float Glass Model FG is primarily intended for monitoring and controlling glass or refractory temperatures in the forehearth, but also in the regenerator, tank and refiner. However, it can also be used for cost effective temperature measurement in a range of other applications.

The Land Fibre optic cable Model FG fulfils the Float Glass industry’s need for a simple, cost effective alternative to other types of radiation thermometers which normally require water cooling. It also readily permits upgrade from existing thermocouple installations. A versatile adjustable mounting assembly, complete with quick release adapter and air purge, facilitates ease of installation and removal for inspection purposes.

The signal processor unit is located remotely from the high ambient temperatures encountered at the optic head, linked by a sealed 6.1m long fibre optics light guide eliminating the need for water cooling. The processor provides high accuracy linearization of the detector signal, adjustable emissivity compensation, a self test function and a low drift 4 to 20mA output suitable for use with process computers and distributed control systems.

Several models are available with temperature measurement spans to suit the particular application.

Model FG – Float Glass Temperature – Key Benefits

  • Minimal services – no water cooling required.
  • Simple 2-wire 4-20mA current loop installation.
  • Accurate and reliable measurement up to 1650°C.
  • Built-in test facility.
  • Emissivity adjustment.
  • No on-line calibration required.
  • Continuous measurement – rapid interchangeability of system.
  • Calibration traceable to National Standards, backed by.


Model FG Glass Temperature - Loop Power 4...20mA Model FG Glass Temperature - Typical Locations  Model FG Glass Temperature - Foreheat
Loop Power 4…20mA

Model FG Glass Temperature – Technical Specifications

FG 9.8/13C
FG 10/14C
FG 12/16.5C
980°C to 1300°C
1000 to 1400°C
1200 to 1650°C
Linearization conformity:
Temp. coefficient:
<0.04°C/°C – mid span
<0.07°C/°C – span extremities 5°C
Output 4 to 20mA (linear)
Response Time 0.5s (to 98%)
Spectral response 0.7 to 1.0 m
Emissivity 0.10 to 1.00 (adjustable) (factory set to 1.00)
Max Temp Optic head
Max Temp Light guide
Max Temp Processor:
10 to 60°C
Power requirement 24V d.c. (nominal) 18 to 40V d.c.
Over voltage protection 250V a.c.


Model FG Glass Temperature – Information

Land Instruments Datasheet Model FG Glass Temperature – Datasheet

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