When the electromagnetic flowmeter is not in use when it is stopped, we must adopt scientific and reasonable maintenance and maintenance methods for the electromagnetic flowmeter.
In the electromagnetic flowmeter technical service for the user, it is often encountered that after the user purchases the electromagnetic flowmeter for a period of time, the use of the measured data is inaccurate again.
In fact, this is not a problem with the quality of the electromagnetic flowmeter itself. Because the user did not follow the instructions for the post-use maintenance and maintenance methods.
First, the electromagnetic flowmeter maintenance regularly checks the sensor electrical performance:
First, the inter-electrode resistance was roughly measured. Disconnect the signal between the sensor and the transducer. The sensor is filled with liquid. Use a multimeter to measure the resistance of the two electrodes and the ground. Whether it is within the range specified by the manufacturer and the measured values ​​are approximately the same.
Record the resistance value measured for the first time. This value is useful for determining the cause of the sensor failure later, such as whether the deposited layer is conductive or insulating.
Next, the sensor is vented to a liquid, the inner wall is wiped clean, and after being completely dried, the resistance between the two electrodes and the grounding terminal is measured with a megohmmeter.
Finally, check the insulation resistance of the excitation coil, remove the sensor excitation coil, connect the terminal and the converter, and measure the insulation resistance of the coil with a megohmmeter.
Second, the electromagnetic flowmeter maintenance zero check and adjustment:
Before the electromagnetic flowmeter is put into operation, after the power is turned on, the zero point must be adjusted when the electromagnetic flow sensor is filled with liquid. After the start of operation, zero-point check shall be conducted for the use of conditions to stop the flow regularly; in particular, for precipitation and easy-to-pollution electrodes, non-clean liquids containing solid phases shall be inspected at the initial stage of operation to obtain experience and determine the normal inspection cycle. Exciting electromagnetic flowmeters and square wave impulse ratios are more likely to cause zero drift, so more attention should be paid to inspection and adjustment.
An example of a faulty application error with two deposition layers. One is the oil drilling cementing project, the total flow of infusion cement slurry is an important process parameters, often using high-pressure electromagnetic flowmeter. The meter is used intermittently, and the measuring tube is rinsed with fresh water after completion and the remaining time is an empty tube. Due to incomplete cleaning, the residual cement slurry on the inner surface of the measuring tube solidified into a thin layer, which accumulated in the past two months to form an insulating layer, covering the entire surface of the electrode, resulting in abnormal operation and eventually failing to work.
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