| 摘要 |
<p>A magnetic differential pressure indicator is provided for detecting and indicating a pressure differential thereacross that is greater than a predetermined value in a fluid system, having a port (23) that permits introduction or withdrawal of fluid for testing of operability under the predetermined pressure differential, and having a bimetallic element (60) that prevents false actuation of the element at abnormal temperature, and a deactuator (92) for the bimetallic element (60) that permits such testing of the indicator via the port (23) for operability even at such abnormal temperature.</p> |
