| 摘要 |
<p>A pressure surge sensor has a body (10) having a cylinder passage (13), a magnetically actuated electrical switch (17) mounted on the body, and a piston member (20) movable along the passage relative to the switch. The piston member carries a magnet. When the cylinder passage (13) is coupled to a fluid pressure surge source, a fluid pressure surge applied causes the piston member to move along the cylinder passage relative to said switch, thereby actuating the switch. A breakable retainer element restrains the piston member against movement, and the piston is freely movable along the cylinder passage, after release by the retainer. The pressure surge sensor is suitable to be arranged downstream of a rupture disc, which releases overpressure of a pressurised apparatus, for example an extrusion apparatus, or a gas handling or gas storage system.</p> |
