Infrared Temperature Measurement | Combustion & Environmental Monitoring

Container Glass

Temperature measurement is critical for the glass making process. The relationship between weight and temperature of molten glass is very linear, making accurate temperature measurements is very important for quality container glass characteristics.

Click on the different sections on the diagram to see which Land products are most suited for each step of the process.

Container-glass-schematic-v1 A-regenerator B-portarch C-tankroof E-tankbase D-melttankexit F-canal G-forehearth H-gob K-annealinglehr
Regenerator Port Arch Melt Tank Melt Tank Base Melt Tank Exit Canal/Refiner Glass Forehearth Gob Annealing Lehr


550-3000 °C (1022 to 5432 °F)

Accurate and reliable temperature measurement of the crown and packing is essential for this important and vulnerable area of the tank. Thermocouples, despite their lower initial cost, can rapidly deteriorate. Infrared thermometers provide a long-term, cost effective and more reliable measurement.

Tankdiagram Tankspot

Port Arch

550-3000 °C (1022 to 5432 °F)

Measurement of the port arches, especially in cross-fired furnaces, can provide important information on basic firing conditions, giving early indication of an incorrect or unbalanced firing situation.


Melt Tank

Thermocouples have been used for many years for this crucial measurement. However, at the high temperatures at which they operate deterioration can be rapid and often undetectable due to contamination of the element and migration of elementary materials from one wire to the other. With the NIR-B Glass it is possible to use the proven technology of the NIR Thermal Imager to accurately and continuously profile the temperature of the entire furnace, including glass, refractory walls and port arches and the crown/roof, with only a small opening in the wall.


Melt Tank Base

100-1000 °C (212 to 1832 °F)

The condition and safety of the furnace refractories are vitally important, especially as the end of a campaign approaches. An Arc radiometric thermal imager can continuously measure temperatures of the refractories and provide both warnings and alarms to minimize the possibility of glass break-out or refractory failure.

Arc Melt-tank-base-screenshot

Melt Tank Exit

The AMETEK Land Fibre-optic Model FG radiation thermometer is a 2-wire temperature sensor which has been specifically designed to solve measurement problems and improve control of process temperatures in the glass industry.


980-1300 °C (1800 to 2400 °F)

The temperature of glass emerging from the Refiner and Canal can be critical. As in many other areas of the process, thermocouples can be easily damaged and have a limited useful life. They can also introduce "seeding". Radiation thermometers are non-intrusive and can give many years of trouble free operation.


Glass Forehearth

Delivering the glass, in an homogeneous condition and at a precise temperature makes accurate and consistent temperature control in the forehearth vital. The silicon cell detector used in so many radiation thermometers in the glass industry is at the heart of the fibre optic Model FG thermometer, custom designed for this application. Water cooling is not required and installation is simple.



It is vital to obtain an accurate measurement of gob temperature to maintain the relationship between glass viscosity and gob weight. Both portable thermometers such as the Cyclops 100L and on-line thermometers such as SPOT M100 fibre optic are available, and have been proven over many years to improve the reliability of the measurement and therefore product quality.


Annealing Lehr

A low temperature thermometer at loading point views the conveyor chains to ensure that they are heated sufficiently to prevent cracking or build up of stress in the glass. Defects in finished product may only become evident when it leaves the annealing lehr. LAND provide a high speed process imaging capable of thermally mapping the surface of the cooling glass product. Our LSP_HD 50 thermal scanners are ideally suited to this application.