Have you ever encountered such a situation as an instrument? In the use of electromagnetic flowmeter, "the meter is not energized or yellow screen, there is flow through but no flow display, the display is unstable, the number of upper and lower turns or no output", urgently contact the factory after-sales personnel, and then start each A kind of blabla... description of the scene, due to the lack of accuracy and organization, the result of the other party heard a confused. If the manufacturer has a service point in the local area, it can also be rushed to the scene in a short time, otherwise the fastest is about 24 hours, the result can only be anxious.

Then, in order to improve the communication efficiency of the after-sales personnel, as the field instrument staff, what kind of homework can we do for different fault situations before contacting the after-sales service and communication? The following Xiao Xun brings you the electromagnetic flowmeter troubleshooting dry goods, hurry and learn!

First, the meter is not powered or yellow screen

1. Determine whether the instrument has been used normally before the fault, and assist the after-sales personnel to judge whether the instrument is damaged before leaving the factory;

2. Check whether the fuse is in good condition, and check whether the fuse is damaged during the power-on process;

3. Check whether the terminal and voltage are correct, and make sure that the power cord is connected according to the instructions;

4. Measure the input voltage of the power terminal of the meter with a multimeter to eliminate the fault caused by the unstable voltage;

5. Verify the number of power load devices and eliminate the voltage drop caused by voltage division;

6. Check if the header board has obvious burnt black marks? Is the capacitor exploded? And photograph the circuit board to the after-sales personnel to eliminate the situation of high voltage breakdown;

7. Clearly photograph the circuit board and send it to the after-sales personnel, which is convenient for the after-sales personnel to initially judge the solder joint path and facilitate subsequent voltage detection.

Second, there is traffic but no traffic

1. Determine the daily average or historical instantaneous amount, that is, the empirical flow value, and accurately state it to the after-sales personnel. The purpose is to help the after-sales personnel to eliminate the situation that the on-site flow is lower than the lower limit of the instrument flow;

2. Inform the meter to measure the medium, help the after-sales personnel to determine whether the meter is suitable for electromagnetic flowmeter measurement, and exclude non-conductive media;

3. Check whether the front and rear valves are all open, and eliminate the flow meter caused by the operation error, and the meter does not display the flow meter;

4. Whether there is a FGP or SYS alarm sign (small bell) on the meter head, check the air traffic control situation;

5. Whether the height of the outlet end of the flowmeter installation position is higher than the inlet end, check the dissatisfaction caused by the wrong installation.

Third, the number is not stable, the number of up and down

1. Inform the after-sales personnel to install the on-site pipeline material, plastic or metal, to help the after-sales personnel to check whether there is any non-metallic pipeline ungrounded;

2. Check whether there is a grounding ring installed and the grounding condition. If necessary, take photos and send it to the after-sales personnel to help the after-sales personnel to determine whether there is a grounding ring problem.

3. Inform whether the normal operation has been performed before, and help the after-sales personnel to judge whether there is a factory problem;

4. Inform the measurement medium to eliminate the electrode problem caused by the medium;

5, clear fluctuation range, from zero to positive, or from negative to positive, to further determine the fluid instability caused by poor grounding, or caused by excitation damage, a large range of hops;

6. Check whether there is an excitation alarm display on the meter head to eliminate the instability caused by water soaking;

7. Check whether the ground wire and the grounding screw are turned on to eliminate the ground wire from being broken.

8. Photographing the installation location and the flow direction of the media, so that the after-sales personnel can preclude in advance whether the number of indicators indicated by the installation position is unstable.

Fourth, not allowed

1. Whether it is too large or too small, it is convenient for the after-sales personnel to make judgments;

2. Determining the theoretical flow and the actual flow respectively, and excluding the case that the flow rate is lower than the lower limit;

4, clear display is not allowed, or output is not allowed, to exclude information output problems;

5. Determine whether the pipeline is a plastic pipe, and whether there is any inaccuracy caused by lack of grounding;

6. Whether the flowmeter installation is at the high point of zui, eliminate the dissatisfaction of the tube, and carry out on-site photos when necessary to facilitate communication with the after-sales personnel;

7. Determine whether the vertical installation and the flow direction of the medium exclude the measurement of the dissatisfied tube;

Five, no output

1. What is the clear output method? Is current, 485, pulse, or GPRS wireless;

2. Whether there is instantaneous display of the meter head, if not, refer to the flow through the no-display processing mode to help the after-sales personnel to judge the table problem, or output module problem;

3. No output of current: whether the DC current of the IOUT and COMM terminals of the meter is removed after the load is removed;

4. No output of pulse: whether the POUT and COMM terminals of the meter have a straight voltage after the load is removed;

5, 485 no output:

(1) Check whether the parameter "communication address" in the header is correct;

(2) Check if the data address in the communication protocol is correct;

(3) Test with the 485 test software provided by the manufacturer, is it normal;

6, GPRS:

(1) Identify the date and time of the last successful communication;

(2) Defining whether the antenna part of the installation site is covered by water;

(3) Determining whether the antenna position is below the iron manhole cover;

(4) Determining whether there is a mobile phone signal in the underground, and judging that there is no signal caused by no signal;

(5) Check if the parameter settings meet the requirements.

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Calcium carbide is an inorganic substance, the chemical formula is CaC2, the main component of calcium carbide, white crystals, industrial products are gray-black lumps, and the cross section is purple or gray. It reacts violently when encountering water, generating acetylene and releasing heat. Calcium carbide is an important basic chemical raw material, mainly used to produce acetylene gas. Also used in organic synthesis, oxyacetylene welding, etc.

Acetylene produced by the reaction of calcium carbide with water can synthesize many organic compounds such as synthetic rubber, synthetic resin, acetone, ketene, carbon black, etc.; at the same time, acetylene-oxygen flame is widely used in metal welding and cutting.

Store in a cool, dry and well-ventilated warehouse. Keep away from fire and heat sources. The relative humidity is kept below 75%. The packaging must be sealed and protected from moisture. It should be stored separately from acids and alcohols, and avoid mixed storage. The storage area should be equipped with suitable materials to contain the leakage.

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