How to properly install, use, maintenance, pressure gauge?

How to properly install, use, maintenance, pressure gauge? There are eight points. 1. Before installation should check whether the instrument model, specifications, precision grade conform to the requirements of the instrument to use. Check the instrument and installation of the nipple which is female. 2. Pressure gauges shall be installed vertically, slope is generally not more than 30 & deg; , and strive to maintain the same level with measurement point, lest bring indication error. 3. After installation, in the case of without pressure, observe whether the pointer in the zero or close to the nail plate check, or unfavorable use. 4. Measurement of steam pressure, the lower pressure gauge shall be equipped with annular tube, used by the water to steam pressure, in order to avoid high temperature steam into spring tube, effect the precision of instrument, careless or melted the solder, causing leakage meter, accident or burns. 5. When used, should slowly open the valve, the pressure slowly up to the job position. If suddenly open the valve, such as the pressure out of control, more than measurement limit, can cause spring tube smashed, deformation or cause fan gear teeth and make the instrument lose function. 6. After using, should slow pressure relief, don't make the pointer suddenly dropped to zero, this pointer back to the house on the nail plate check, pointer will be bending even interrupt. 7. Instrument according to specified requirements for verification or maintenance. 8. Tear open come down to the instrument should be stored in dust, dry, no corrosion environment.