流速仪测流时发生的故障,往往可以借助信号发出的情况即时发現,并判断出是什么毛病,以便及时排除,現分別敘述如下: (一) 流速仪軸纏草有两种情况:一是流速仪軸被較大的水草缠住,这时旋杯馬上不轉,故障可以即时发現;另一是仪器被细线般的水草根須缠入軸中,这时,仪器的信号由未被缠住前的較快而均匀的情况,突然变慢,有时是信号漸漸地慢下去,这表明水草仍在继續卷入,有时是信号慢而均匀,这表明水草已不再缠入。但是无論怎样,只要发現了这些故障,均应立卽将仪器提出水面,檢查仪器軸有无缠草或杂 Flow meter flow when the fault occurred, often with the signal issued by the real-time discovery, and determine what is wrong, in order to exclude, are described as follows: (A) of the flow meter shaft wrapped in two cases: one Is the axis of the flow meter was entangled in larger plants, then immediately turn the cup does not turn, the fault can be found immediately; the other is the thin wire-like plant roots entangled in the shaft, then the signal from the instrument The faster and more uniform condition before being entangled suddenly abruptly, sometimes the signal slowly fades, indicating that the plants are still getting involved, sometimes slow and even, indicating that the plants are no longer entangled . However, no matter what, as long as these faults are found, they should be erected to raise the water surface of the instrument, check whether the instrument shaft is not wrapped with grass or miscellaneous