The installation of industrial bimetallic thermometer

Bimetallic thermometer with different expansion coefficient of solid combination together two pieces of metal heat element, generally made spiral wound, its one end fixed and the other end with a pointer. When the temperature changes, the thermal component of curvature change, free end rotation, drive the pointer indicates the temperature value on the dial. Many users in the use of bimetallic temperature time, installation without deep understanding of it, all feel just installed. In fact in the installation of the bimetallic thermometer still has a lot of knowledge, its measurement accuracy is determined by installing a big aspects. 1, the bimetallic thermometer should be installed on the straight pipe, the installation requirements of minimum diameter generally above DN80, expanding tube length should be not less than 250 mm. 2, can also be installed in vertical or inclined 45 & deg; Installation, tilted 45 & deg; When installation, should contact with the tube flow into a counter-current. 3, the appropriate installation height of 1. 2 to 1. 5m。 More than 2. 0 m best equipped with straight ladder into activity when the platform. For ease of maintenance, the minimum distance platform should not be less than 300 mm. 4, for a process with a branch pipe, the installation, pay special attention to installation positions and process flow, and try to avoid installed in the valve, elbow and pipe and equipment position near the corner, appendix. 5, bimetallic thermometer with a protection casing with heat transfer and heat loss, in order to reduce the measurement error, should have enough: (insert depth 1) For measuring pipeline fluid temperature at the centre of the thermometer, generally should be measuring end is inserted into the pipe center ( Vertical or inclined installation) 。 As the current body of pipe diameter is 200 mm, the insert depth should choose 100 mm; （ 2) For high temperature and high pressure and high velocity of temperature measurement, Such as main steam temperature) , in order to reduce cases of fluid resistance and prevent cases break under the action of a fluid, can be taken to protect shallow plug-in mode or use heat pipe. Shallow plug-in protection casing, and its depth into the steam pipe should be no less than 75 mm; Hot shell standard insert depth of 100 mm; （ 3) When measuring the original insertion depth of more than 1 m, shall be installed vertically, as far as possible or add racks and protect casing. At the time of installing metal thermometer, must master the correct method of use, so as to guarantee the normal use, the use of the maximum effect.