Patent EA-005170-B1 (EA)
Title: Pressure transmitter installation in a process line of a process facility
IPC: G01L19/00
Filed: 2002-08-01
Abstract: 1. A pressure transducer assembly for measuring the pressure in a process circuit of a process plant, comprising a process line connecting flange and a downstream pressure measuring line, a primary shut-off device is arranged as a primary element in the pressure measuring line, said device being connected from the inlet to the process line, wherein the primary shut-off valve has a locating chamber in a shut-off valve housing block, in which a shut-off regulating movable valve is located, wherein said regulating valve can be regulated from a passage position for allowing flow from said inlet of said valve chamber to said outlet of said valve chamber, and a closed position for preventing flow through said valve chamber, a pressure measuring cell (17; 41) comprising a pressure sensor and measuring electronics (22; 39) connected thereto, characterized in that no other shut-off devices are required and the pressure measuring cell (17; 41) is directly integrated in a closed shut-off chamber (15; 41) with minimized dead space, which is located directly after the shut-off regulating element (9; 33, 34) of the primary shut-off device (5; 33, 34). 2. The pressure transducer of claim 1 wherein the locating chamber of the shut-off valve is in the form of pressure measuring cell (17) said pressure carried by a detachable cover element. 3. The pressure transducer of claim 1 or 2 wherein said pressure sensor comprises a pressure membrane extending traversly across said closed pressure circuit at said outlet. 4. The pressure transducer of any one of claims 1-3 wherein the measuring electronics (22; 39) is in the measuring electronics housing, which is mechanically connected to the primary shut-off device. 5. The pressure transducer of claim 4 wherein said electronics housing (21) is mechanically connected to the said detachable cover element of the pressure measuring cell (17). 6. The pressure transducer of any one of claims 1-5 wherein designed as a differential pressure sensor unit (23) with two pressure measuring circuits (29, 30), each of them is connected to one of the shut-off regulating element (33, 34) in, at least in one unit (35, 36) of the shut-off valve housing, and no other shut-off devices are required and the pressure measuring cell (17; 41) is directly integrated in a closed shut-off chamber (15; 41) with minimized dead space, wherein both circuits no other shut-off devices are required and the pressure measuring cell (17; 41) is directly integrated in a closed shut-off chamber (15; 41) with minimized dead space, wherein pressure measuring circuits (29, 30) are each connected to one side of the differential pressure sensor (38). 7. The pressure transducer of claim 6 wherein each of said closed pressure circuits extends parallel, at least, in one unit (35, 36) of the shut-off valve housing outgoing from its connecting flange (27, 28) and are then brought towards each other to end on opposite sides of said differential pressure sensor (38) at said central differential pressure cell (37). 8. The pressure transducer of claim 6 or 7 wherein the unit (35, 36) of the shut-off valve housing adapted for adjoining to each other in the region of said central differential pressure cell and are capable of being separated to provide access to said central pressure cell.