1. The instrument appearance shall be clean and tidy, the nameplate shall be in good condition; All the parts shall be complete and no damage, their location shall be correct and the fasteners shall not be loosened. 

2. The accuracy is ± 0.5% of the range of transmitter, the error of indication is within the allowed basic error, the return error shall not be bigger than the absolute value of the allowed basic error. 

3. Sealing：The measurement parts of the transmitter shall not have leakage and damage phenomenon under the rated pressure. 

4. Insulation: The insulation resistance of internal electric circuits of the earthing terminal of the transmitter to the shell shall not be less than 20 megohm.