Straight thermocouples with metal and ceramic protecting tubes are widely used in a variety of processes between –200 °C and 2320 °C. The maximum operating temperatures given in the catalogue apply to the air where there are no corrosive gases.
EMF characteristics of the thermocouples in this catalog conform to DIN 43710 and IEC 60584 standards.
In order to increase the life-span of thermocouples the materials for the thermocouple, element wire insulator, protecting tube and connection head must be selected according to operating conditions. The maximum operating temperatures given in the catalogue apply to the conditions where operating medium is air.
Although the exceeding of the maximum temperature limits specified for short periods do not effect the results, they will reduce the life of the thermocouples. Corrosive substances in the process also causes the upper temperature limit to be lower for the protecting tube.
Protecting tubes must be selected in accordance with the conditions of the process. As a rule, metal protecting tubes are used up to 1200 °C and ceramic tubes are used over 1200°C.