The bimetallic thermometer which error is acceptable?

Bimetallic thermometer is a kind of measuring instrument, in the process of actual measurement, can allow a reasonable error. What are the error of the bimetallic thermometer is acceptable? 1. Basic error, error of the thermometer range expressed as percentage. Provisions shall not exceed the table below: 2. Angle adjustment error, adjustable Angle thermometer Angle adjustment caused by the change should be no more than a thermometer range value of 1. 0%. 3. Back to the poor, the back of the thermometer should be no greater than the absolute value of basic error limits. 4. Repeatability error, and the repeatability error of the thermometer should not be greater than the absolute value of basic error limits 1/2. 5. Electric contact thermometer, its set point error should not exceed the basic error of 1. 5 times. 6. Switch, electric contact thermometer, the change-over difference should be not greater than the basic error absolute value of 1. 5 times. 7. Repeatability error, switch electric contact thermometer, its switching repeatability error should not exceed the basic error absolute value of 1/2. 8. Thermal stability, the detecting element in the measurement of the thermometer upper limit in the table below after the stipulated time, throw should comply with the provisions of the basic error. 9. Time constant, the time constant of the thermometer should be no more than 40 s. 10. Long running performance of electric contact thermometer under the rules of non inductive load, to electrical flow, maximum allowable time interval 2 s to 5 s, carries on the cumulative frequency of 1. 50000 times the closing of the disconnect cycling test, should be no damage. Thus, the error of the bimetallic thermometer as long as in a reasonable range, which can be accepted.