Infrared Temperature Measurement | Combustion & Environmental Monitoring

FAQs: Glass

Container Glass

1. Melt Tank

The NIR Borescope for continuous monitoring of the refractory temperature with 32 thousand measurement points and for routine spot checks the Cyclops 100 L (2F)
The NIR Borescope whilst providing continuous temperature monitoring provides a high quality visual image than can be used to optimise flame length
By utilising a high accuracy thermal imaging device like the NIR Borescope to measure, monitor and log refractory temperature trends allows instantaneous information to trigger key alarms as well as long term trend analysis. Positioning an ARC thermal imaging camera underneath the glass tank to detect for hot spots allows early warning of potential weak spots.
The high quality image produce by the NIR Borescope allows real time data to be streamed in time lapse modes to allow the Process Engineers to visualise the flow of the glass melt batch over the process time. This allows statistical levels and alarms to be set in the control equipment on optimum glass quality production.

2. Forehearth

The Model FG fibre-optic thermometer is the standard industry choice for Forehearth applications allowing correlation against triple X themorcouples to provide a dynamic temperature feedback of the Forehearth. The model FG is exceptionally stable over time compared to thermocouple solutions and will provide you a consistent datum to allow offsets to be applied to the system. Particularly of benefit for use in coloured glass applications where measuring the near surface temperature will avoid the top becoming frozen during cooling operations.

3. Glass Gob

Using a fixed or portable spot infrared thermometer depending on visual access to the gob. Typically a Cyclops 100L or ratio (two colour) fixed point infrared thermometer eg. R1 or R100.
The weight of the Gob can be directly correlated from the temperature, utilising the Cyclops 100L or a ratio infrared thermometer like the R1 or R100.

4. Glass Mould

The Glass Mould Thermometer (GMT) is a portable instrument designed to make this measurement. Temperature reading can be logged and analysed.

Flat/Float Glass

1. Lehr

There are two options; either a row of highly correlated fixed spot infrared thermometers measuring lines down the Lehr or the more accurate line scanning solution. The line scanner utilise one fixed spot infrared thermometer that is rotated using a mirror arrangement to view a 80 degree scan angle with up to 150 scan lines per second builds a complete thermal image of the Lehr being scanned. Utilising a nominal 5 micron wavelength, the LSP-HD 50 is optimised for measuring glass temperature and allows optimisation of the Lehr heating and cooling to ensure optimum throughput and quality
There are two options either a row of highly correlated fixed spot infrared thermometers measuring lines down the Lehr or the more accurate line scanning solution. The line scanner utilise one fixed spot infrared thermometer that is rotated using a mirror arrangement to view a 80 degree scan angle with up to 150 scan lines per second builds a complete thermal image of the Lehr being scanned. Utilising a nominal 5 micron wavelength, the LSP-HD 50 is optimised for measuring glass temperature and allows optimisation of the Lehr heating and cooling to ensure optimum throughput and quality

Glass Tempering/Toughening

The key to glass tempering is highly accurate temperature profiles across the glass line being tempered. The LAND solution is to utilise a single 5 micron wavelength detector fitted in a line scanning device which uses rotating mirrors to image the whole of the glass lite being tempered. This allows visual images of the temperature profile to be viewed by the operators and control either manually of by feedback into the PLC of the speed of the conveyor system or the rate of cooling exiting the tempering furnace. The LSP-HD 50 range is specifically optimised for this type of application and is placed between the exit of the furnace and the air quench.
Using a LSP-HD 50 line scanning device to measure the low emissivity glass from the top and the use of underside infrared temperature thermometers, typically the Solonet due to its compact form, provide underside temperature correction for the glass lites being measured.