What is the principle and use method of food thermometer?

Often use thermometer friends can know, food thermometer according to different purpose, has been designed and manufactured a variety of thermometer. The basis of its design are: the use of solid, liquid and gas is influenced by temperature and heat bilges cold shrink phenomenon; Under the condition of constant volume, gas ( Or steam) The pressure due to different temperature change; The role of thermoelectric effect; The change of resistance with temperature changes; The influence of thermal radiation, etc. Generally speaking, any physical properties of all matter, as long as it along with the change of temperature and drab, significant changes in, and made available to signal temperature thermometer. Glass rod thermometer right using method is as follows: 1. First observation range, dividing value and 0 points, the measured liquid temperature cannot exceed range; 2. All the glass bulb thermometer into the liquid by side, don't touch the bottom of the container or the container wall; ； 3. Glass bulb thermometer immersed in liquid after being tested to wait for a moment, with a thermometer readings stability after reading; 4. Reading thermometer glass bulb to remain in the liquid, the liquid column in the line of sight with thermometer faces flat above. Instrument here warm prompt: before the temperature never left! This will affect the accuracy! Bimetallic thermometer right using method is as follows: 1, the temperature of the instrument often work best to 1/2 to 3/4 in scale range. 2, instrument should be in - Within 30 c ~ 80 c ambient temperature to work normally. 3, WSS series bimetallic thermometer in custody, installation, use and transportation process, should try to avoid collision protection tube, don't make the protection tube bending, deformation. When installation, it is forbidden to twist the instrument shell.