The Model 414 Annealing Furnace is designed to heat, anneal and cool SPRTs (Standard Platinum Resistance Thermometers) prior to calibration. The temperature range of the furnace - from ambient to 1000°C - enables all types of SPRTs to be annealed.
One of the duties of a calibration laboratory manager is to ensure that the SPRTs used are fully annealed and still within specification. Merely using the thermometers within the laboratory will cause work-hardening in the platinum coil of the SPRT. Therefore, regular annealing is required to ensure the SPRTs are in an ideal condition.
In 1990, the then-new temperature scale, ITS-90, specified the use of SPRTs up to the Silver point (961.78°C). At these temperatures, quartz is very porous, and in reducing atmospheres the SPRTs can quickly become contaminated.
The Isotech Annealing Furnace offers a safe solution for those who wish to anneal SPRTs up to 1000°C
To prevent contamination at high temperatures, a constant flux of pre-heated air passes the SPRTs being annealed.
A comprehensive handbook accompanies the Furnace.
This Furnace is installed simply and requires no maintenance.