1. Instrument engineering should be loop tested before the system is put into use.

2. The power supply and air supply for instrument loop test shall be provided by regular power supply and air supply.

3. Calibration standard instruments and meters shall have valid metrological verification certificates, and the absolute value of their basic errors shall not exceed 1/3 of the absolute value of the basic errors of the calibrated instruments.

4. The calibration points of a single instrument should be evenly selected within the full range of the instrument, generally not less than 5 points. During loop test, the calibration point of the instrument should not be less than 3 points.

5. The field bus instrument should use the bus communicator to check the internal parameters of the equipment.

6. The integrated control system shall be tested in the control room before loop test and system test.

7. The programmable controller system with analog control should be tested for analog input and output, and at the same time, the operation and control functions should be tested.

8. Fieldbus control system should also carry out bus address allocation check and bus system power supply check and test.

Summary:

This knowledge point is familiar and easy to be assessed in the form of multiple-choice questions.