| 摘要 |
An instrument installation system is provided which uses interchangeable hardware components and improved methods to connect differential pressure transducers to process piping. The system is designed to permit the instrument to be close coupled, direct mounted to the process connection or close coupled, support mounted using substantially the same system in both designs with simply the addition/subtraction of interchangeable components. Close coupling and very close coupling ensure that maximum accuracy in the measurement is possible. Pre-aligned root valve pairs and flange adapters pairs are provided, along with further adapters used when needed, to allow a rigid pipe, direct mounting of the transducer to the process connection without flange alignment problems. The installation system forces the rigid pipe impulse lines into a horizontal coplanar alignment with the centerlines of the high and low pressure ports of the differential transducer to minimize measurement errors of the kind associated with prior art remote mounted instrument installations. An improved feature of the system over the prior art is also the elimination, if desired, of threaded connections in contact with the process fluid. The interchangeable hardware components are provided in different combinations that form instrument installation kits which provide substantial economies in design, procurement, installation, maintenance and servicing of process instrumentation.
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