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FLT5B - Float Line

Accurate and flexible infrared thermometer measurements for measuring glass surface temperature in the tin bath and annealing lehr on float lines. 
  • Overview +

    The FLT5B is a standalone thermometer offering precision measurement of the surface temperature of glass float lines, ensuring consistently high product quality throughout the process.

    Offering excellent precision and long-term stability, the FLT5B’s extensive measurement range removes the need to use a range of temperature monitoring instruments on the float line, simplifying system integration and operation.

    Accurate temperature measurement is vital in ensuring uniformity across the entire width of the glass.  The FLT5B measures glass surface temperature in the range 250 °C to 1300 °C / 482 °F to 2372 °F, with excellent precision and long-term stability.

    High measurement precision is achieved using AMETEK Land’s leading-edge infrared technology, which gives a highly accurate, non-contact measurement with 1m fixed-focus 50:1 optical field of view.

    Custom-designed for use in float lines in the glass production, the FLT5B is suitable for use through the process: from the initial floating and forming in the bath, to the cooling and annealing sections in the tin bath and annealing lehr.

    Providing a spectral response from 4.8 to 5.2µm, the FLT5B measures from 250 to 1300 °C / 482 to 2372 °F. This means the thermometer can be used at more points on the line, reducing the number of different types of device needed.

    With low ‘penetration’ into the glass, the thermometer’s 50:1 optics and fixed 1m focus ensure 98% energy from the 20mm target spot. This gives precise, stable results for surface temperature, even in conditions of high atmospheric humidity.

    The 4-20mA loop-powered thermometer is quickly demountable from a cooling jacket, and is compatible with an extensive range of mountings and accessories including System 4 range, enabling use in harsh conditions

    The FLT5B is AMETEK Land’s infrared thermometer dedicated to the tin bath and annealing lehr on glass float line applications.


  • Specifications +

    Models Measurement Range:
     FLT5/B C 250 °C - 1100 °C
     FLT51/B C 400 °C - 1300 °C
     FLT5/B F 500 °F - 2000 °F
    Spectral Response  4.8 to 5.2 µm 
    Field of View  50:1 at 1m focus (fixed) 
    Output  4 to 20 mA current loop
    Response Time (0-95%)  1 to 10 seconds adjustable
    Emissivity Adjustment  0.1 to 1.09 in steps of 0.01
    Interchangeability :
     1 °C
    Resolution 0.2 °C 
    Stability  0.023% of span per 1 °C change in ambient temperature 
    Accuracy 0.25 %K or 5 °C
    0.25 %K or 9 °F
    (Whichever is higher)
    Ambient Limits 0 to 60 °C specified; -10 to 80 °C operating 
    EMC  EN 50 082-2 (immunity); 
    EN 50 081-1 (emission);
    IEC 1010 (safety) 
    Sealing To requirements of IP65/NEMA 4X 
    Vibration  3g (10 to 300Hz) 
    Power Supply  12 to 45V d.c.

  • Documentation +

  • Related Applications +

    • Tin bath
      Tin Bath (Flat)

      To produce glass of consistently high quality, it is vital to understand the temperature profile at this point where the glass solidifies on molten tin. A FLT5A thermometer is recommended.

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    • Tin Bath Exit
      Tin Bath Exit

      Measurements at the exit of the tin bath provide important product quality information ahead of the annealing process. Our recommended solutions are the LSP-HD 50 linescanner and FLT5A thermometer.

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    • Annealing Lehr
      Annealing Lehr

      Accurate measurement of the temperature profile is vital during cooling. The FLT5A thermometer, LSP-HD 5FL linescanner and JRG/A application-specific thermometer are recommended to provide this essential monitoring.

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    • Annealing Lehr Entry and Exit
      Annealing Lehr Entry and Exit

      The lehr must be sufficiently heated to prevent cracking or stress points in the glass. The LWIR-640 measures the cooling product at each end of this process to detect problems.

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