What are the bimetallic thermometer calibration project?

Bimetallic thermometer is the most commonly used a thermometer in the thermometer, especially in industry, bimetallic thermometer is to test after production well, but need to check what, this is a lot of people don't know! Instrument to introduce to everyone today: bimetallic thermometer calibration project can be divided into four: ( 1) Appearance inspection, including the scale lines on the dial, Numbers, and other marks shall be complete, clear; The glass should be transparent and without obstruction of the defect of reading; Each connection parts should be strong. （ 2) Check value: the value of the thermometer error should be no more than allow foundation, namely, level 1, 1. Level 5, 2. 5, 4 were not greater than the range & plusmn; 1%,± 1. 5%,± 2. 5%,± 4%. （ 3) Poor poor back: the back of the thermometer should be no more than allow basic error absolute value. （ 4) Repetitive inspection, only for the new product to the factory checking. The repeatability error of the thermometer should be not more than half the fundamental error absolute value allowed. ( 5) Stability check, just for the new product to the factory checking. The thermometer in the measurement after the prescribed time limit, it shall be no more than allow of error of fundamental error.