| 摘要 |
A housing for a pressure switch is coupled to a pipeline. The housing has a tubular body with an explosion-proof enclosure attached to the body with a retainer sleeve inserted through an opening in the enclosure and threaded into the body to secure the enclosure to the body in an axial direction. The body of the housing may be coupled to the pipeline via an interstitial trim device. The body and trim are preferably coupled together using left-hand threads. The enclosure is further secured to the body by a pin that extends from the enclosure into a corresponding pin receptacle in the body. The pin opposes rotation of the enclosure with respect to the body and prevents attempts by field personnel to remove the pressure switch from a pipeline by simply turning the enclosure. This arrangement also avoids disruption of the calibration of micro-switch components contained within the enclosure. In addition, the left-hand threads in the junction between the body and the trim keep the body from being loosened from the trim.
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