Pyrosales' Glass Industry Sensors
Our products are constantly being updated to meet the challenging and ever-changing production techniques of glass manufacture. We specialise in custom designed and engineered solutions.
The viscosity of glass in a container forehearth has a major effect on the flow rates and gob weight. Installation of thermocouples across the forehearth allows for accurate monitoring and control of the glass temperature. As the viscosity is temperature dependent, it results in an homogenous glass flow.
For the glassmaker, there are a number of benefits to this accurate control:
- Optimum weight of each container
- Reduction in tank wear, which increases the tank life
- Overall cost savings by higher yield of containers per batch
Molten glass is a very harsh environment and any thermocouple immersed in it must be able to withstand the severe conditions.
The Tri-level assembly is:
- protected from the aggressive nature of the glass by an outer sheath of ODS® Platinum or a Platinum/Rhodium alloy
- has three measuring points spaced to give readings of top, middle and bottom temperatures.
- allows for accurate control of heating and cooling to give a homogeneous glass flow.
Tri-levels are arranged along and across the forehearth to suit the complexity of the control system. Each Tri-level is designed to suit the individual forehearth.
Careful attention is paid to optimising the life expectancy with the overall cost of each assembly.
Tri-levels are available with the following calibrations:
- Type 'R' ( Pt/Pt 13%Rh)
- Type 'S' (Pt/Pt10%Rh)
- Type 'B' (Pt6%Rh/Pt30%Rh)
Pyrosales uses Fibro® Platinum in both Type 'R' and 'S' Tri-levels to improve element strength and increase overall assembly life.
Types of Glass Industry Sensors
Pyrosales supplies three main styles of glass industry sensors:
- Ceramic Design: a lightweight design that typically uses a short platinum thimble, thus reducing the amount of platinum required for the sensor. One needs to take a great deal more care with this design as the ceramic sheath is prone to thermal shock, which can cause the thermocouple to fail and the platinum thimble to be lost in the forehearth.
- Fully Welded Design: the most rugged design of all the different styles available. As long as the transition point to the support sleeve is kept out of the furnace, the platinum sheath will remain intact for the life of the thermocouple, thus enabling the thimble to be recycled.
- Single-Point In-Glass Thermocouples: some applications only require single-point measurement. The same design style as a tri-level can be used but with only one thermocouple junction. This junction can either be at the bottom or at some other elevated point.