| 摘要 |
A device for continuously monitoring the difference in pressure of fluid in two closed spaces and separated by a dividing wall comprises an open-ended tubular housing which is secured to a rigid tube passing through and rotatably mounted in a horizontal passage in the wall with their axes inclined at an angle to one another. By rotably adjusting the housing with respect to the wall, the housing can be arranged to lie at a desired angle to the horizontal. The housing has a length three times its internal diameter and is transparent in end parts and opaque in a central part, each part being equal to a third of the total length of the housing. Two balls, each of a diameter slightly less than the internal diameter of the housing, are retained and free to roll within the housing, the ball remote from the wall being green and the other red. When fluid in the closed space into which the inclined housing protrudes is at a pressure a desired value below the pressure of fluid in the other closed space, the green ball will be urged by fluid pressure into the higher transparent end part of the housing and the red ball will be urged into the opaque central part of the housing, thereby giving a readily recognizable indication of the acceptable state of the fluid pressure differential.
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