Temperature Sensors Workshop

Tempsens Instruments Pvt Ltd one of the largest manufacturer of temperature sensors in India with a long experience of more than 35 years in the field of measurement organized workshop on "Temperature Sensors". Here is the Glimpse of the workshop

Platinum in Glass industry

Use of platinum in glass industries today is very vital as platinum is only metal which is un

wetted to glass, so to improve the life of the assemblies which are in direct contact with

molten glass platinum is essentially used.

In this paper we will discuss about an alloy of platinum (called hardened platinum) which is

specially developed to be used in molten glass temperature measurement with thermocouples.

Platinum Thimbles for Thermocouples

Thimbles made of special platinum alloy containing 10% Rhodium with

small% of Zirconium oxide or yttrium oxide (as grain stabilizer), are

developed specially for the application in glass industries.

Theses materials offer significantly improved performance over

conventional platinum and its alloys.

It is a new class of materials and has optimized it for special

applications:

 High strength with good ductility in the high temperature range (up to 1700°C).

 Excellent weld ability while the strength is maintained.

 Exceptional corrosion resistance and a more stable microstructure over longer service

times.

 Less re-crystallization.

These characteristics allow for longer service lives for

the individual components and permit the precious

metals to be used more economically, for instance

through reduced wall thicknesses. The higher

strength of the material also has a stabilizing effect

on the equipment manufactured from it. Strengthening components of e. g. molybdenum,

ceramics or refractory metals thus become effectively redundant. The inclusion of finely

distributed zirconia as a dispersion impedes grain growth to a temperature just below the

melting point. Due to the modified, finer microstructure, it is considerably less sensitive to

corrosion processes along the grain boundaries than comparable materials. This ensures better

corrosion resistance

Ultra High Temperature Thermocouples

High-Temperature Thermocouples

Temperatures up to 2000°C and above 

Tempsens offers special Ultra high temperature thermocouples for high temperatures upto 2300 °C for highly corrosive and/or reducing atmospheres. These thermocouples are offered in either Pl atinum/Rhodium (t ypes R, S , or B)  Tungsten/Rhenium (types C or D) elements, with a variety of insulations and sheath materials. Depending upon the sheath material selected, these thermocouples are used in inert, oxidizing, reducing or vacuum conditions. The maximum temperature is based on the lowest max. temperature of the element, insulation and sheath material. The use of high-temperature sheath materials in an oxidizing atmosphere is possible only to a limited (low) temperature. Excluded from this are sheath materials of platinum alloys. The table on page 4 of this product information serves as an indication. To a large extent these thermocouples are used in Temperatures up to 2000°C and above aeronautics, research laboratories and in industry. Ultra High Temperature Thermocouples Ÿ Custom - tailored designs available for many applications Ÿ Suitable for oxidizing, reducing, Ÿ Neutral atmospheres and vacuum Ÿ Pressure-/vacuum-proof bushings available in many forms Ÿ Transition elements variable within a wide range Ÿ Profile thermocouples available on request Ÿ Calibration at high temperature in Inert or vacuum atmosphereSpecial Advantages :In the case of long thermocouples it can be advantageous for cost reasons to have a transition to a different material – e.g. Inconel or stainless steel. The insertion length of the part exposed to the high temperature can be dimensioned as requested. also compensating cables can be used after the transition sleeve.For special applications it is possible on request to mount several thermocouples into a common protection tube. The position of the measuring points for profile thermocouples can be chosen within a wide range.These thermocouples are supplied with tracable calibration and material certificates, in case required each of the thermocouple can be calibrated in specific inert or vacuum atmosphere.