...．3 取下测量板上的玻璃管清洁，由于玻璃管太脏，测量板上的光检测器无法探测到流经玻璃管的凹液面，故报flow error（流速错误），所以清洁玻璃管后故障排除。
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有些用户想要通过降低砂料流速降低运行成本，这是错误的。
It is wrong that some users want to reduce the operation cost through reducing the flow rate of sand.
如果由于回流或操作者的错误引起泄露的话，它还可能造成最高的泄露流速。对于危险产品，这一点须充分考虑到。
It also creates the highest release flow rate potential due to downstream leakage or operator error, which should be adequately addressed for hazardous products.
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