Thermometer targets glass industry

01 September 2007

Calex has targeted the glass industry with an infrared thermometer, claimed to eliminate problematic reflections.

The Thermosight GL is a handheld infrared thermometer that measures at specific wavelengths to obtain consistent and accurate readings.

Using a narrow band 5.14µm spectral filter, the thermometer can measure 1.5m into the glass, which is claimed to eliminate the reflections that can hamper more traditional 8 to 14µm instruments.

Sheet glass can be particularly problematic as it is highly reflective and often surrounded by objects significantly hotter than itself. This typically occurs during the annealing process when the sheet passes through a double row of heaters. Although virtually impossible for an 8 to 14µm pyrometer, this situation is tackled by the Thermosight thermometer. Its measurement from 1.5mm inside the surface of the glass bypasses any possible reflections, allowing it to provide an accurate reading of the glass and nothing else.

Furthermore it can be difficult to measure on the float line with standard sensors. This can be due to the presence of hot refractories or flames that can give rise to false readings because of their high temperature reflections. The Thermosight GL is claimed to be immune to these reflections, whether they are constant or varying.

With a temperature range from 150°C to 1800°C, the thermometer can handle all stages of the glass production, from furnaces and melt tanks through Gobs and Moulds and into the Lehr. With a narrow 50:1 field of view, and concentric laser sighting to highlight exactly the area being measured, this model can pinpoint small targets at long distances, allowing operators to remain far from potentially dangerous high temperature processes.

A USB interface allows connection to a PC. This can be used in conjunction with a tripod for continuous data recording, or for downloading the stored measurement values of the Thermosight GL Plus model.

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