Electromagnetic flowmeter air tube alarm reason, in the general pipeline liquid measurement, the flowmeter only measurement of one-way liquid, if the liquid azimuth changes, the measurement can not be carried out.The flowmeter that can measure two-way total flow rate is rare, what we understand below normal circumstance has electromagnetism flowmeter and ultrasonic flowmeter, electromagnetism flowmeter positive and negative flow direction can undertake according to the setting.In horizontal installation, the total flow option provides a lot of convenience on the spot.But in vertical installation the liquid is only bottom up according to the flowmeter.Electromagnetic flowmeter is strictly regulated on the full tube. When the flow time of liquid through the full tube does not reach the regulation, the flowmeter will appear the air tube alarm, and the meter head shows no total flow.

Electromagnetic flowmeter in the application process will often encounter atc alarm condition, electromagnetic flowmeter atc alarm refers to the test to determine whether the liquid filled tube controller, detection of atc alarm occurs reason, we can according to use converter signal input terminal and ground wires to a 3 point short circuit, the results of the determination if atc is full, then the electromagnetic flowmeter converter under normal circumstances, the cause of the failure will be measured liquid conductivity low or atc error threshold Settings.In addition, if there is a problem with the electrode of the electromagnetic flowmeter, there will also be an air traffic alarm.

Atc alarm thresholds often complement each other for atc alarm applications.Atc alarm threshold, generally set at 500%, atc alarm is a relative value, it with full package status and dielectric conductivity is a direct relationship, atc alarm thresholds are size will determine the atc, the sensitivity of alarm before the atc alarm threshold is determined, the determination shall be * * * first is medium (that is, the conductivity) and the medium in the condition of full pipe resistance rate.Then consider the liquid wall hanging time and set the alarm response time appropriately, so the threshold of the air traffic control alarm should be an adjustable parameter.

In practical applications, the value of the resistor when the liquid is in the state of full tube is defined as 100%, that is, when the liquid is full tube, the measured value of the air tube is calibrated to 100% with the "air tube alarm threshold".When the liquid level in the pipeline is lower than the measuring electrode, the relative resistor will be increased. When it is higher than the alarm threshold of the atc, the instrument panel will display the atc alarm system.Theoretically, the atc alarm threshold is set at 900%. When the atc, the atc alarm can be displayed.The smaller the alarm threshold, the more sensitive the alarm.Each is set according to the demand on the spot.Treatment method for electromagnetic flowmeter when air traffic alarm occurs:

1. Determine whether the liquid fills the measuring tube;

2. Connect the converter signal to the terminals SIG1, SIG2 and SIGGDN3 with a wire to short-circuit. At this point, if the "atc" prompt is cancelled, it indicates that the liquid conductivity bottom or atc threshold and atc range under normal condition of the converter are set incorrectly;

3. Check whether the signal line is connected correctly;

4. Check whether the controller electrode is normal;

5. Make the total flow zero and observe that the conductance ratio should be less than 100%;

6, in the current circumstances, were determined terminal SIG1 and SIG2 SIGGDN Ω resistor should be less than 50 k.

At present, Shanghai porcelain flowmeter has been exported to more than 100 countries, involved in more than 100 industries.At the same time, the research and development of micro flowmeter also obtained the metrological certification.At home to fill the gap in the micro flowmeter, while breaking the monopoly of foreign enterprises.