Electromagnetic flowmeters are widely used in the flow detection of conductive liquid media. The following is a brief introduction by the technicians of Xudong Instrument Factory. The reason and treatment method of the electromagnetic flowmeter when the flow rate shows a negative value during installation or operation.
There are several reasons why the flow rate of the electromagnetic flowmeter shows a negative value:
1. The sensor is not installed according to the flow direction indicator, resulting in the opposite measurement direction. Solution: Reinstall.
2. The sensor signal line is reversed. Since the electromagnetic flowmeter has a forward and reverse flow measurement function, the reverse flow is displayed. Solution: Change the signal line.
3. The pipe is empty or not filled, and there is gas. At this time, the flow meter will display negative or flow values. Treatment method: Fill the pipeline with the measured medium, so that the flowmeter has the measurement conditions.
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RJ45 interface can be used to connect RJ-45 connectors. It is suitable for the network constructed by twisted pair. This port is the most common port, which is generally provided by Ethernet hub. The number of hubs we usually talk about is the number of RJ-45 ports.
RJ45 is a type of different connectors (for example: RJ11 is also a type of connector, but it is used on the telephone); there are two different ways to arrange the RJ-45 connector: one is white orange, orange, white green, blue, white blue, green, white brown, brown; the other is white green, green, white orange, blue, white blue, orange, white brown, brown; therefore, there are also wires with RJ45 connector There are two kinds: straight line and interleaved line.
The RJ-45 port of the hub can be directly connected to terminal devices such as computers and network printers, and can also be connected with other hub equipment and routers such as switches and hubs. It should be noted that when connecting to different devices, the jumper method of twisted pair cable used is different.
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