Electromagnetic flowmeter exactly what skills, how to quickly install the following summary of the experience of the source instrument for everyone to analyze.
First, the installation of the sensor
1 ) When measuring the mixed phase fluid, choose a place that will not cause phase separation; when measuring a two-component liquid, avoid mixing in the mixture that is not yet uniform.
Downstream; when measuring chemical reaction pipelines, it should be installed downstream of the fully completed reaction section;
2 ) Avoid as much as possible negative pressure in the measuring tube;
3 ) Avoid large electric motors, large transformers, etc. nearby to avoid electromagnetic interference;
4 ) Avoid high concentrations of corrosive gases in the surrounding environment as much as possible;
5 ) Avoid direct sunlight as much as possible;
Second, the installation of straight pipe requirements
First of all, note that the sensor itself cannot serve as a support point for the load. It cannot support the adjacent work pipe and should have the pipe load holding it. In order to obtain normal measurement accuracy, the electromagnetic flow sensor must also have a straight pipe section of a certain length upstream, but its length is lower than that of most other flow meters. 90o elbow, T-tube, concentric reducer, and full-opening valve shall be 5 times the diameter (5D) of the straight pipe section from the sensor's inlet flange connection surface; valves with different opening degrees shall require 10D; the downstream straight pipe segment shall be (2 ~ 3) D; but to prevent the butterfly valve plate protruding into the sensor measuring tube. The lengths of the upstream and downstream straight pipe sections proposed by various standards or verification regulations are also inconsistent. As summarized in Table 2, the requirements are higher than usual. This is due to the requirement to achieve the current class 0.5 accuracy meter.
Third, the installation position and flow direction
The axis of the measuring electrode must be approximately horizontal;
The measuring pipe must be completely filled with liquid;
Flowmeter should have at least 5xD (D is the inner diameter of the flowmeter) in front of the flowmeter and at least 3xD behind (D is inside the flowmeter.
(Diameter) The length of the straight pipe section; for ease of installation and removal, pipe expansion joints can be installed after the flow meter.
The flow direction of the fluid is the same as the direction of the flowmeter arrow;
The presence of a vacuum in the pipe can damage the inner lining of the flowmeter and requires special attention;
There should be no strong electromagnetic field near the flowmeter; there should be sufficient space near the flowmeter for installation and maintenance;
If there is vibration in the measuring pipe, there should be a fixed bearing on both sides of the flowmeter;
When measuring the mixed liquid of different media, the distance between the mixing point and the flowmeter must be at least 30×D (D is the inner diameter of the flowmeter);
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