CCPI Europe presents the Low Drift MI Thermocouples at Heat Treat 17
25 October 2017 By Robert Godley
CCPI Europe presents Low Drift Base Metal Mineral Insulated Thermocouple Cable and Thermocouples for high temperature applications – Ohio October 17
This week, our Technical Director, Trevor Ford, attended the presentation in Ohio – USA, to present the exciting data from new Low Drift Base Metal Mineral Insulated Thermocouple Cable and Thermocouples for high temperature applications.
History of the project
Over 10 years ago, a student studying at the University of Cambridge a project looking temperature measurement using contact sensors, He conducted the thesis on the drift characteristics on base metal thermocouples and studied the reason why base metal thermocouples drift. The new Mineral Insulated Thermocouple Cable has been created directly from this research.
Initially the study looked at the causes of drift in type K thermocouples.
He conducted a lot of work on bare wire thermocouples and the causes of drift, however this presentation looks at the work done on drift in mineral insulated (MI) thermocouple designs. This work showed one of the main causes of drift in MI constructions (that could be improved) was due to contamination from the other sheath.
It would be difficult to change the outer sheath material (properties were required in operation) By using a barrier between the outer sheath and conductors to reduce migration.
The project and the new low drift prototypes then underwent vigorous testing at various high temperature cycles to continue the research. The results seemed too good to be true, and again they underwent high temperature testing and again, the same results.
The new low drift cables had over 80% drift reduction at 1200℃ and over 90% at 1300℃.
The bulk of the laboratory test under the EMPRESS project on the dual wall MI cable will be conducted under the direction of the University of Cambridge.
In addition, a number of field trial will be conducted, these are currently underway, at various industrial sites.
Two in particular are being conducted at heat treatment sites in the UK and Europe. These will involve dual wall MI thermocouples being used as the operational measurement sensors at high temperature under real life operational industrial conditions.