Electromagnetic flow meter selection and installation of the rules:
First, the primary clarity of the measurement needs of this unit
There is a number of clear metrology requirements, mainly: measurement media, flow M3 / h (minimum, work point, maximum), medium temperature ° C, dielectric pressure MPa, device mode (pipeline or puncture), etc.
Second, the conditional conditions for selecting (electromagnetic flow meter)
1. It is necessary to test the conductivity liquid (i.e., the voltage measured by the fluid having a low limit of ZUI).
2. The test medium should not be rich in ferromagnetic media or a lot of bubbles.
Third, you should know the principle of measurement of electromagnetic flowmeter
The principle of the measurement is based on the Law of the Lati-based electromagnetic induction, that is, the flow of fluid flows through the magnetic field perpendicular to the moving direction, and induces a voltage proportional to the uniform flow rate (also known as volume flow), the voltage signal through the voltage signal. Two electrodes that are directly touched by the fluid and transferred to the amplifier through the cable, and then transform it into an output signal.
Fourth, you should know the main features of electromagnetic flow meters
Its main features are:
(1) There is basically no compression damage in the measurement, which is not easy to block, and the amount of the slurry has a common adaptability;
(2) The demand of direct pipe sections is low;
(3) low frequency rectangular wave excitation, unaffected by work frequencies and on-site distribution disturbances, and the operation is secure;
⑷ Transmitter body can be used in whole stainless steel, and has an anticrapic, anticine, and anti-corrosion.
⑸ On-site appearance converter can be used for dedicated smart chips, convenient parameters;
The inside of the transmitter can be set in the catalyst, and the transmitter constant and the factory check value can be self-careful, which is convenient for debugging and maintenance;
The measurement is wide, and the full-scale flow rate can be set within 0.3m / s-12m / s scale;
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⑼用 Wide range: can be used for chemical, metallurgy, paper, food, oil, urban water supply and other categories.
V. Custom of the type of type
1, the first clear is to select the pipeline ") electromagnetic flowmeter '), or a piercing electromagnetic flowmeter.
2. Normally, select the site without showing the current electromagnetic flowmeter, the output 4-20mA (or 0-10mA) current signal to the secondary appearance of the control chamber and can appear flow and total amount.
3. If the flow of the pipeline is investigated, the on-site display electromagnetic flowmeter can be selected.
4, when the environmental demand or the amount of measurement is high, the safety voltage intelligent electromagnetic flowmeter can be selected.
5. The flow of 200mm or more large tube diameter flows or uncovering conditions can be preferred to select a piercing or enhanced piercing electromagnetic flowmeter.
6. Choice key for sensor caliber
1. Select the caliber of the sensor as the tuner diameter of the connection, the length of which is convenient for the device (without the need for a weapon); its condition is that the flow rate of the fluid in the tube must be in 0.3m / s-10m / s scale; its applicable The fluid flow rate in the project is in a low state.
2, select the caliber and connection of the sensor to the connection of the technical pipeline, its applicable status: (1) The flow rate is low, the traffic is stable: (2) Decreased price ratio:
Selection key for seven, fabric data
According to the corrosive, wear and temperature of the company, the wear, and temperature is selected by the subscriber, and the "fabric data function and applicable scale table" supplied by each manufacturer can be found.
Eight, the selection of electrode materials
According to the corrosiveness of the company, the subscriber is selected, and the "electrode data corrosion resistance function table" supplied by each manufacturer can be found.
Nine, protect the level of protection
According to national standard GB4208-84, the housing protection level is: If the outer table device is under the ground and is often flooded, it should be selected; if the outer table device is selected, it is appropriate to select a spray water.
Ten, the choice of upper limit traffic
1, usually select the passage of the transmitter as the piping path of the connection. Since there is a strict function, the flow rate and the flow rate will be selected, see the electromagnetic flowmeter upper limit flow table supplied by the manufacturer, and select the upper limit stream at the corresponding path.
2, because the flow rate of the technical piping is less than the ZUI small upper limit stream value in "1" in the "1" in the "1", the transmitter can be selected, that is, the transmitter is less than the transmitter. Accepting radius.
XI, the selection of the way
1. Overall style: Some of the sensing of the flowmeter and some of the transformations are integrated, and the strength is easy to facilitate the device.
2, other leaves: Some of the sensing of the traffic gauge is on the tubular pipe, and some devices are converted into indoors for easy operation. Suitable for situations where the live environment is poor (but the length should be less than 30m).
12, the selection of the grounding ring
If the pipeline of the interface is insulated from the test medium, it is necessary to select the ground ring.
Thirteen, the selection conditions of the ball valve
Regarding the problem of fluid flow in the technical demand pipe, the demand is not overflowing, and the ball valve is required. For the loading and relief flow timing, the aggregation of the flow (or the loading operation does not affect the pipe operation), the flow meter is directly mounted on the flange short tube without adding the ball valve.
XIV, the device pays attention to the key
1. The electrode axis is necessary to adhere to the approximate level.
2. Guaranteed that the measurement tube is necessary to finish every time.
3, in the tube flange proximity to ensure that the device space that is satisfied with the nut is left.
4. There is a pipeline support in the pipe section of the lavage flowmeter to reduce the pipeline operation oscillation.
5, the flowmeter should prevent strong electromagnetic fields adjacent.
6, long line, should control valve and cutting valve at the flow meter.
7. In case of "opening feed or emission", the low-region device of the pipe should appearance.
8. The imported linear tube section is greater than or equal to 5 times the tube with the electrode axis, and the outlet pipe is greater than or equal to 2 times the tube.
Fifteen, (flow meter) grounding needs
The sensor should have an outstanding ground wire (copper core cross section ≥16mm2), which is grounded electrical resistance <10 ohm;="" when="" the="" insulating="" layer="" is="" applied="" or="" non-metal="" pipes,="" the="" sensor="" should="" be="" provided="" on="" both="" sides="" of="" the="" sensor="" (ground="" wire="" copper).="" the="" core="" section="" is="" ≥16mm2).="" xvi,="" cable="" and="" electrical="" connection="" pay="" attention="" to="" key="" other="" parallel="" cables="" (signal="" transmission="" and="" excitation),="" the="" shorter,="" the="" shorter="" from="" cutting="" disturbances="" and="" saving="" funds,="" better.="" typically,="" the="" conductivity="" of="" the="" media,="" the="" cross="" section="" of="" the="" excitation="" cable,="" the="" type="" of="" signal="" cable="" (core,="" layer,="" shield).="">
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