We are looking for 1 precision. 0 of the bimetallic thermometer

Precision proximity on the part of the observed value and true value, it is a more important for measuring instrument parameters, is also one of the important indexes of measuring instrument quality fit and unfit quality. The accuracy of the bimetallic thermometer level commonly used in general is 1. 5, the other one. 0, 2. 0, 2. 5, 4. 0. In the national standard JB/T8803 - bimetallic thermometer There is clear regulation in 1998, the basic error of no more than basic error limits stipulated in the table below, the basic error in thermometer range expressed as percentage. Error is smaller, the higher the accuracy of the instrument, and the reference error is associated with the full-scale range of the instrument, therefore, when using the same precision level instrument, often take compression range scope, to reduce the measurement error. In order to meet the needs of the production, some industrial equipment using bimetallic thermometer on the accuracy grade of higher precision requirements 1. 0, namely & plusmn; 1. Below - 0%, example 40 ~ 80 ℃ measurement range, the error in 1. 2 degrees. Principle of the precision of the bimetallic thermometer, different structure is the same, the bimetallic thermometer is a round shape into threaded heat bimetallic strip as thermal devices, and put it in a protective sleeve tube, one end is fixed, known as the fixed end, the other end of the connection on a thin shaft, called the free end. Spool at the free end is equipped with a pointer. When the temperature changes, the resulting thermal devices the free end of the rotation, drive the thin axis from the Angle of the pointer changes, corresponding temperature indicator on the dial.