rapid-response expendable thermocouple plastic accessories Positherm thermocouple insert

It shows a cut-away view of a standard Positherm Immersion Thermocouple.
It consists of:
- Thermocouple wires, which are rigorously selected in order to guarantee an accuracy of 0 to + 3 °C at 1554 °C (Pd melting point). Positherm thermocouples are available in type S, R or B calibrations.
- a quartz tube, protecting and positioning the thermocouple wires.
- a compensated Connector, assuring good contact between the thermocouple and the Contact Block mounted on the immersion Lance.
- a ceramic housing, protecting the thermocouple assembly.
- refractory cement, insulating the thermocouple wires and the cold junction so that its temperature remains below 200 °C during the measurement.
- a metal cap, which protects the quartz tube during transport and avoids that slag may adhere to the quartz tube when passing through the possible slag layer on top of the molten metal. This cap is made of steel for application in steel melts. For application in low temperature steel, cast iron and aluminium alloys, it is made of aluminium. A copper cap is used for measurements in copper alloys.
- a cardboard tube, protecting the contact block, probe holder and compensated inner cable during the measurement. Cardboard tubes are available in different lengths to suit different applications.