当 流量控制仪表 系统的指示值达到最小的时侯，先检查现场检测仪表运作状况，运作正常说明故障在显示仪表上： 1. When the indicated value of the flow control instrument system reaches the minimum, first check the operation status of the on-site detection instrument. If the operation is normal, the fault is indicated on the display instrument:
）当现场检测仪表指示值显示最小时，需要检查调节阀开度，倘若调节阀开度为零时，一般是调节阀与调节器之间故障。 ( 1 ) When the indication value of the on-site testing instrument shows the smallest value, it is necessary to check the opening degree of the regulating valve. If the opening degree of the regulating valve is zero, there is usually a failure between the regulating valve and the regulator.
）当现场检测仪表指示值显示最小时，然而调节阀开度正常时，说明极大可能是操作不当，系统压力不够，泵不上量，系统管路堵塞，介质结晶等原因造成故障原因。 ( 2 ) When the indication value of the on-site testing instrument shows the smallest value, but when the opening degree of the regulating valve is normal, it indicates that it is most likely that the operation is improper, the system pressure is insufficient, the pump cannot be measured, the system pipeline is blocked, and the medium is crystallized. .
）若是仪表方面的故障，可能是孔板差压流量计正压引压导管堵 ， 差压变送器正压室漏 ， 机械式流量计是齿轮卡死或过滤网堵等原因。 ( 3 ) If it is a fault in the instrument, the positive pressure induced pressure conduit of the orifice differential pressure flow meter may be blocked , the positive pressure chamber of the differential pressure transmitter may be leaked , and the mechanical flow meter may be blocked by gears or blocked by a filter.
当流量控制仪 表 系统的指示值达到最大的时侯，往往检测仪表也会指示最大。 2. When the indication value of the flow control instrument system reaches the maximum, often the detection instrument will also indicate the maximum. At this time, the size of the valve can be adjusted by manual remote control. The flow of the process can be reduced due to the process operation, and the flow value cannot be reduced due to the instrument system. ; 检查仪表测量引压系统是不是正常 ; 检查仪表信号传送系统是不是正常。 Check whether the control valve of the flow control instrument system is working ; check whether the instrument measuring pressure system is normal ; check whether the instrument signal transmission system is normal.
当 流量控制仪表 系统指示值出现频繁波动的时候，将控制改至手动，仪表方面的原因或是仪表控制参数 PID 不合适时会造成波动减小；工艺操作方面原因会造成波动仍频繁。 3. When the indication value of the flow control instrument system frequently fluctuates, change the control to manual. The instrumental cause or the instrument control parameter PID is not appropriate will cause the fluctuation to decrease; the process operation cause the fluctuation to be frequent.