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DTT - Drawing Tower

AMETEK Land Fixed Spot Non-Contact Thermometers / Pyrometers - DTT - Drawing Tower
A short-wavelength infrared thermometer providing precise and stable temperature measurement for control of optical fibre drawing tower furnaces. 
  • Overview +

    A highly accurate temperature measurement of optical fibre drawing tower furnaces, DTT is a Drawing Tower Thermometer that enables production of high quality, low loss optical fibre to the required strength and attenuation.

    As AMETEK Land’s market-leading infrared technology avoids the practical issues associated with contact measurement methods in high temperatures, DTT improves process control to ensure a high-quality product is made without unnecessary waste.

    As the furnace lining can get close to melting point in the process, the furnace temperature is used as the heating control parameter. DTT’s silicon cell detector offers the high stability, rapid response, and sensitivity to temperature change needed to monitor temperature accurately and safely.

    Designed for standalone operation and available in two models optimised for different temperature ranges, DTT provides the communications fibre optic industry a highly precise temperature measurement solution for optical fibre production.

    Designed to operate in furnaces with typical temperatures of 2200 °C (4000 °F), the DTT uses a short wavelength and silicon cell detector to provide a stable measurement which responds quickly and sensitively to temperature changes.

    The thermometer only needs a small target size to make an accurate reading, making it easy to install and flexible to position in induction heated furnaces or graphite resistance furnaces, where fields of view are limited.

    With a rugged, flexible and modular design, the DTT uses industry standard outputs, meaning it suits any process monitoring, recording or control system. It has conventional industry mountings, and can be individually certified traceable to National Standards.

    The DTT is AMETEK Land’s non-contact solution designed for optical fibre drawing tower furnaces.


  • Specifications +

    Model  DTT 800/2600C DTT 1500/4700F
    Temperature Range
       Operating 800 to 2600 °C  1500 to 4700 °F 
       Specified 1000 to 2600 °C  1830 to 4700 °F 
    Wavelength 1μm 
    Response Time Adjustable 5ms to 5s (0 to 95%) 
    Emissivity Emissivity adjustable 0.10 to 1.00 
    Output 4 to 20mA 
    Field of View (Nominal)
    Target Dia 
       DT1 Optic Head 4mm at 450mm   0.15in at 17.7in 
       Repeatability <2 °C / 4 °F 
       Absolute <0.75%K 
       Temperature 0.3°/°amb 
       Time 2 °C/year   4 °F/year 
    3g any axis, 10 to 300Hz 
    Humidity  0 to 99% non condensing 
    Sealing  To IP65 requirements  To NEMA 4X requirements 
    Ambient Temperature 
       Optic Head 200 °C  392 °F 
       Lightguide 200 °C  392 °F 
       Specified 0 to 70 °C  32 to 158 °F 
       Operating  -10 to 80 °C 14 to 176 °F 
    Weight  1.7kg  3.75lb 
    EN 50-082-2 (immunity), EN 50-081-1 (emission), IEC 1010 (safety) 
  • Documentation +

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      The quality and performance of fibre-optic communications depends on accurate temperature monitoring during production. AMETEK Land offers dedicated solutions for the essential measurement points.

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