1. The instrument must be vertical: a 17mm wrench should be used to tighten it during installation, and the case should not be forcefully twisted; Collisions should be avoided during transportation;

2. The instrument should be used in an ambient temperature of -25~55 ℃;

3. The vibration frequency of the working environment is less than 25Hz, and the amplitude is not greater than 1mm;

4. If the ambient temperature is too high during use, and the indicated value of the instrument does not return to zero or exceeds the tolerance, the sealing rubber plug on the upper part of the meter casing can be cut open to make the inner chamber of the instrument open to the atmosphere;

5. The range of instrument use should be between 1/3 and 2/3 of the upper limit;

6. Isolation devices should be added when measuring corrosive media, media that may crystallize, and media with high viscosity;

7. Instruments should be regularly calibrated (at least once every three months), and any malfunctions should be promptly repaired;

8. If the instrument fails or is damaged due to poor manufacturing quality under normal storage and use conditions within six months from the date of delivery, the company shall be responsible for repairing or replacing it;

9. Instruments for measuring corrosive media should be specified with the required conditions when ordering.