| 摘要 |
A method and apparatus for precise measurement of low differential pressures existing between known high reference pressures and high test pressures. One or more scanner modules are used, each module enabling a reference pressure to be applied to a set of differential pressure sensors located in the module. Adding a second module allows a different reference pressure to be applied to a second set of sensors located in the second module, and using additional modules allows additional reference pressures to be applied to more sets of sensors. Each module enables the application of known calibration pressures to the sensors incorporated in the module. The present method and apparatus are more economical and less complex compared to prior art systems in which manifolds and associated valving are not integral with the modules but are located in separate patch panels and have to be connected to each sensor module by a multiplicity of pneumatic jumper lines.
|
