| 摘要 |
PURPOSE:To measure exactly specific gravity of a mother liquor by connecting a pressure leading pipe to a charging pipe inserted from a tank wall and making water of a fixed quantity flow, in two parts being different in a depth from the surface of an ammonium sulfate mother liquor of a crystallizing tank, and by a back pressure difference and a depth difference of an inflow water of the two parts by a differential pressure transmitter connected to the pressure leading pipe. CONSTITUTION:Charging pipes 21, 22 inserted through tank walls of each different depth such as h1 and h2 from the surface of a mother liquor or an ammonium sulfate crystallizing tank 1 are provided, and pressure leading pipes 31, 32 are cnnected to each of them. A fixed little quantity of water is made to flow in the pressure leading pipes 31, 32 through flow meters 4, 4 from a water supply pipe 5, and a differential pressure transmitter 6 is provided on the way of the pressure leading pipes 31, 32. By using such a device, water of a fixed quantity is made to flow into a motor liquor from the tips of the charging pipes 21, 22, and a differential pressure P2-P1 of both the pipes is measured continuously. In this way, it does not occur that the mother liquor flows in from the tips of the charging pipes 21, 22, and the crystal closes the pipe end, and accordingly, the specific gravity can always be measured continuously and stably and with a high accuracy without executing an operation stop, etc. |
