In a digital weir, open loop digital control is applied, and the method is simple and reliable. And it can give accurate flow according to the given process curve.

数字量水堰是开环控制方式，方法简便可靠，可以按给定的过程曲线精确可靠地施放流量。

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Masters champion Mike Weir lies second on level par, with Open champion Ben Curtis one over and USPGA winner Shaun Micheel two strokes back.

BBC: SPORT | Golf | Furyk storms clear

Canada's Mike Weir looked like he might challenge for the Open after a strong opening, but a poor inward nine saw him slip back to three over.

BBC: SPORT | Golf | Levet, Weir challenge fades

"My history is not good here, " said Weir, who missed the cut in his first nine attempts at his national open.

BBC: Waite out in front