FLT5A – Float line thermometer

Float line thermometer | Land InstrumentsIn order to achieve consistent product quality on glass float lines, the temperature across the width of the glass must be kept as uniform as possible.  This applies throughout the process: from the initial floating and forming in the bath, to the cooling and annealing sections in the lehr.

The FLT5A measures temperatures from 250 to 1100 °C, reducing the number of different instruments on the line.

Accurate temperature measurement is vital in ensuring uniformity across the entire width of the glass. The Land FLT5A is designed specifically for use in float lines. FLT5A measures glass surface temperature in the range 250 to 1100°C,with excellent precision and long-term stability. In the past, Land has specified SOLO 5 instruments for float line applications. The FLT5A supersedes SOLO 5, offering improved performance from an appreciably more cost-effective and user-friendly package.

It has exactly the same spectral response as the SOLO 5 (4.8 to 5.2 µm) – i.e. it has the same low penetration into the glass and the same insensitivity to atmospheric humidity. The thermometer features 50:1 optics, fixed focus at 1 metre, with 98% energy guaranteed from within the 20mm target spot.

The thermometer is quickly demountable from a cooling jacket and is compatible with a comprehensive range of mountings and accessories, enabling use in the most hostile of environments.

The thermometer operates on a two-wire, 4 to 20mA current loop and is compatible with industry standard indicators and recorders.

FLT5A Float line thermometer – Gallery

FLT5A Float Line Thermometer FLT5A Float Line Thermometer Installation FLT5A Float Line Thermometer Overview
Flat Glass Float Line
FLT5A Float Line Thermometer in housing
Float Line Thermometer Installation Locations


FLT5A Float line thermometer – Technical Specifications

Range 250 to 1100°C
Spectral response 4.8 to 5.2µm
Field of view 50:1 (98% energy) at 1m focus (fixed)
Output 4 to 20mA current loop
Response time (0-95%) 1 to 10 seconds adjustable
Emissivity adjustment 0.3 to 1.10 in 0.01 steps
Resolution 0.2°C
Stability 0.023% of span per 1°C change in ambient temperature
Accuracy (absolute) 0.5%T (K) + 1°C
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.


FLT5A Float line thermometer – Information

FLT5A Float Line Thermometer – Datasheet

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