Selects the measuring instrument should consider what respect?

The selection of temperature measuring instrument is an important work, if improper selection, not only can't meet the production requirements, and may cause accidents, losses caused by. Selects the measuring instrument should consider the following several aspects: first, choose the type of thermometer table according to the technical requirement of instrument type selection is to guarantee the normal work of the instrument and the important premise of safety in production. So before choosing instrument, be sure to in-depth understanding of the technological process and control process of the instrument. General should grasp the following process: 1, the temperature change of the measured object scope and speed of change; 2, the physical and chemical properties of the object to be tested, such as corrosive, oxidizing atmosphere and reducing atmosphere, and the size of the viscosity, degree of fouling, is flammable, explosive, toxic, etc; 3, the object to be tested is stationary or in motion, is a gaseous, liquid or solid temperature, measuring point temperature and average temperature; 4, whether to remote transmission, automatic recording, alarm signal; 5, instrument installation site environmental conditions, such as temperature, humidity, electromagnetic fields, vibrations, and so on and so forth. Second, the choice of temperature measuring instrument accuracy level instrument precision grade is based on the process on the allowed maximum error of measurement is used to determine. The choice of the temperature measuring instrument range for temperature measurement, the measurement accuracy is not only related to choose instrument accuracy grades, and associated with the range of instrument. That is to say, exactly the same grade, but the range of different instrument, its possible absolute error is different. So when choosing instrument range, the same precision level meter should choose as far as possible measure instrument and the measured temperature close to the limit, that is to say, in the operation of the instrument, try to make it work in the measurement limit. However, in order to ensure the safety of the instrument shall be some leeway, normal use of the measuring range is usually 30 ~ 90% of full scale.