Electromagnetic flowmeter when the alarm phenomenon how to deal with?

When using an electromagnetic flow meter, an alarm will occasionally occur. The other party will naturally think that there is something wrong with the flow meter? In fact, specific problems need to be analyzed in detail. The alarm phenomenon of electromagnetic flowmeters often has the following three major misunderstandings:

Myth 1: The electromagnetic flowmeter excitation alarm and system alarm are the electromagnetic flowmeter broken?

System alarm: SYS - system excitation alarm, also called excitation alarm

In fact, excitation alarm and system alarm are the same thing, sometimes also called system excitation alarm, which belongs to intelligent electromagnetic When customers encounter such an alarm due to the excitation signal intelligently detected by the flow meter, it is mostly due to excessive vibration in the pipeline, or the excitation coil is open-circuited due to water and moisture in the wiring box during use.

Solution to electromagnetic flowmeter system alarm:

The solution is also very simple. Users can use a multimeter to detect the continuity of the excitation circuit to judge. The specific terminals are EXT+ and EXT—these two terminal, measure whether there is resistance, and determine the reason for the disconnection of the excitation circuit by judging the resistance. Specific judgment criteria: The resistance of the excitation coil will not exceed 200Ω. There is also a situation where the battery-powered electromagnetic flowmeter has an excitation alarm that detects the resistance of the excitation coil. Although an excitation alarm will occur, it will not affect the measurement results. Users can solve this phenomenon by setting the excitation method.

Myth 2: The empty pipe alarm of the electromagnetic flowmeter is a malfunction of the electromagnetic flowmeter?

Empty pipe alarm: FGP - Fluid empty pipe alarm

Smart electromagnetic flowmeters generally have empty pipe detection functions and do not require additional electrodes. When the user selects the empty pipe alarm, when the fluid in the pipe is lower than the measuring electrode, the intelligent electromagnetic flowmeter can detect an empty pipe state. When the empty pipe state is detected, the analog output and digital output signals of the instrument All are 0, and the meter flow rate display is also 0.

The significance of the electromagnetic flowmeter empty pipe alarm is that customers can know the flow status of the medium in the measured pipeline in real time, and even the status of the empty pipe and full pipe. It is especially suitable for those opaque pipe sections. It is useful for users to judge the pipeline. The fluid inside is more convenient and faster, which reflects the humanized and intelligent design of the intelligent flow meter. Therefore, the empty pipe alarm of the electromagnetic flowmeter is not a malfunction of the electromagnetic flowmeter, but a faithful reflection of the fluid conditions in the measurement pipe. Of course, users can choose to disable this setting as needed.

Misunderstanding 3: The upper limit alarm and lower flow limit alarm of the electromagnetic flowmeter mean that the electromagnetic flowmeter has exceeded the range?

The upper and lower flow limit alarms are calculated according to the percentage of the flow meter’s range. The parameter reflects whether the user exceeds the set range in a specific flow range. It does not mean that the electromagnetic flowmeter exceeds the measurement range. It can only be regarded as a percentage of the range set by the electromagnetic flowmeter. The setting is emphasized here because the electromagnetic flowmeterThe measuring range can be set, sometimes in order to improve the resolution of the electromagnetic flowmeter's output signal. Therefore, for the upper and lower limit alarm phenomena of the electromagnetic flowmeter, the user can set it according to the actual measurement needs. If it is not necessary, It can be optionally turned off and is mainly used as a reminder for customer-specific traffic. The specific solutions are as follows:

The lower limit alarm prompts that the output current, output frequency or pulse exceed the limit. After changing the flow range to a larger or smaller value, cancel the upper and lower limit alarms.