U-type pressure vacuum gauge operation process
When the vacuum gauge is installed vertically on the equipment, the user can buy ￠ 5mm - ￠ 8mm copper pipe to weld with the copper pipe on the upper end of the vacuum gauge, and the other end to be welded with the vacuum valve. Please pay attention to the following matters when welding:
1. The temperature should not be too high to prevent the deformation of copper joint and affect the sealing performance.
2. The copper tube must be cleaned. It can be used if conditions permit. It can not be cleaned with oil.
3. Welding quality assurance, must weld two layers, no air leakage.
4. The "O" ring should be removed carefully and evenly during installation.
When vacuumizing, the vacuum valve must be closed tightly, and the vacuum valve can be opened slowly after the vacuum pump is running, so as to prevent the mercury in the vacuum from being pumped out at once. When shutting down, the vacuum valve should also be closed to prevent the atmospheric pressure from entering the glass tube of the vacuum gauge and breaking the glass tube.
There are two screws to adjust the "0" position in the middle of the dial plate, which have been adjusted before delivery, so the user does not need to adjust it. The medium in the glass tube --- mercury is easy to flow out. During assembly and disassembly, the vacuum gauge should be vertically disassembled and disassembled. If the "0" ring is found with scuffing defect, a new "0" ring should be replaced in time.