How to use the outer wall of full stainless steel bimetallic thermometer to measure electric kettle temperature

All stainless steel bimetallic thermometer is the use of pressed together different pieces of metal heated by two different metal expansion coefficient leads to the principle of bending, the temperature change, the greater the bending are more serious, converts it into a pointer value is temperature. Will be full of water heating electric kettle plugged in, make electric kettle of outside wall temperature gradually raised, find a thickness of 15 ~ 20 cm plastic foam sponge clingy wall outside the electric kettle ( This reduces the temperature loss, more close to actual situation) And on the plastic foam dig two holes close to the outer wall of electric kettle. The measurement end of full stainless steel bimetallic thermometer inserted in a hole in the head, make the bimetallic thermometer WenDuan top wall outside the electric kettle; Using standard platinum rhodium - 10 Platinum thermocouple ( S degree) As a standard, the standard platinum rhodium - 10 Platinum thermocouple WenDuan measurement is close to in the external walls of electric kettle, and fixed well, from plastic foam sponge lead arise out of a hole in the ice kettle. Can approximatively think stainless steel electric kettle bimetallic thermometer measured coal mill bearing outer wall temperature and test temperature of same situation after electrify, electric kettle outer wall temperature gradually raised, on the bimetallic thermometer and electronic potentiometer data respectively.