is a kind of high precision, high intelligence, automatic flow measurement device, so the instrument daily maintenance and maintenance is particularly important.
In some industrial production situation, we will encounter such a situation, is for the use of electromagnetic flowmeter is seasonal or mobility measurement, this kind of situation, how the instrumentation equipment maintenance is particularly want to pay attention to methods.
Intelligent electromagnetic flowmeter in downtime when not in use, we have to respond to flowmeter scientific and reasonable maintenance and maintenance method.
Electromagnetic flowmeter after buying into use for some time, will appear in the process of the measurement data is not accurate, but it is not quality problem caused by the electromagnetic flowmeter, often because they are not in accordance with the instructions in the method for maintenance and problems.
First, zero check and adjustment of the electromagnetic flowmeter maintenance intelligent electromagnetic flowmeter in operation before, after electrify must in the electromagnetic flow sensor with fluid under stationary state adjust the zero point.
After put into operation or to use condition periodically stop flow for zero check;
Especially on precipitation, easy pollution electrode, the cleaning liquid containing solid phase, at the beginning of the run should be checked, in order to obtain experience to determine the normal inspection cycle.
Ac excitation mode of electromagnetic flowmeter with rectangular wave excitation, are more likely to produce zero drift, so more attention should be paid to check and adjust.
Electromagnetic flowmeter maintenance downtime?
Two sedimentary malfunction application example of the error.
Cutting process is an electrolytic test device, saturated salt water flow is controlled by electromagnetic flowmeter, clearance after using a period found that traffic signal gradually weakened, 2 months after the signal is zero.
Reason is electrolytic iron deposition in the process of cutting tube wall, formation caused by short circuit.
Clear stratification is back to normal immediately.
The other one is engineering, oil drilling well cementing filling slurry is an important process parameters, the total flow often use high voltage electromagnetic flowmeter.
Instrument intermittent use, with finish to wash after sensor tube, the rest of the time are hollow tubes.
Due to inadequate cleaning, measuring residue slurry solidifying into a thin layer of tube wall, nearly two months accumulation form the insulating layer, covering the entire electrode surface, leading to run is not normal to not work.
Second, the intelligent electromagnetic flowmeter maintenance of regular inspection sensor performance intelligent electromagnetic flowmeter maintenance downtime?
* first, roughly measure resistance between electrodes.
Disconnect between the converter and signal connection of sensor and sensor inside fluid-filled, to the two electrodes and grounding resistance value is measured with a multimeter, e. range is in the factory, and measured by two values the same.
Record the * time measured resistance value, after this value to judge the sensor failure reason (
If sediment is conducting or insulating)
Secondly, sensor emptying liquid, wipe the lining, after being completely dry megohm meter was used to measure the resistance between the two electrodes and earthing terminal.
In this paper by embellish instrument technology co. , LTD. Arrange release.
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