求翻译：仪表安装前先检查浮球与摆杆是否灵活可靠，按图三法兰的安装位置，应保证浮球在水平位置能沿铅垂方向而摆动，将两法兰对接后，用螺栓紧固。是什么意思？

The instrument installed before check float and the pendulum is flexible, reliable, flange mounting position, should ensure that the float along the vertical direction in the horizontal position and swing after the docking of the two flanges with bolts.

Instrument installation to check before floating ball and swing is flexible, reliable, and figure 3 of the flange mounting position, you should ensure that float in a horizontal position to lead, follow, and the swing direction, will be two flanged, tighten the bolts.

Before the measuring appliance installment inspects the float and the swing link first whether nimble reliable, according to Figure three flange installment positions, should guarantee the float swings in the horizontal potential energy along the normal direction, after two flange docking, is tight

Instrument installation before you inspect the float ball and swing for flexible and reliable, according to the figure three flange installation location should ensure that floating balls in a horizontal position along the vertical direction swing, two flange after docking, using bolt.

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