On line instruments, such as turbine meter, vortex meter and positive displacement meter are usually used for crude oil metering in oil fields.
计量分离器中常用涡轮流量计、涡街流量计或齿轮流量计等在线式仪表计量原油产量。
Problems in running a water fee system are focused on fields to reduce the period of water meter data gathering, accelerate the fund flow and improve the service for users.
缩短抄表时间，加快资金回笼，改善用户服务是研究供水企业营业收费系统的焦点问题。
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