| 摘要 |
<p>A switch (1) comprises a first fluid inlet (3), a first set of electrical contacts (11a,7,11b) and means (4,6) responsive to the pressure at the first inlet (3) for switching the first set of electrical contacts from a first state to a second state when the fluid pressure at the first fluid inlet reaches a first predetermined level. The switch further comprises a second fluid inlet (19), a second set of electrical contacts (1 1a, 14,11b), and second means (17,18) responsive to the pressure at the second inlet for switching the second set of electrical contacts when the fluid pressure at the second fluid inlet reaches a second predetermined level. <IMAGE></p> |
