Electromagnetic flowmeter alarm phenomenon and solution

When the user uses an electromagnetic flow meter, an alarm phenomenon may occasionally occur. The other party naturally thinks about whether the flow meter has failed. Actually, specific issues need to be analyzed. Electromagnetic flowmeter alarms often have the following three errors:

Misunderstanding 1: Electromagnetic flowmeter excitation alarm and system alarm is electromagnetic flowmeter broken?

System alarm: SYS - system excitation alarm, also for the excitation alarm

In fact, excitation alarm and system alarm are one thing, sometimes called system excitation alarm, which belongs to the intelligent excitation signal detected by intelligent electromagnetic flowmeter. When a customer encounters such a situation, it is mostly because the pipeline vibration is too large, or In the course of use, moisture in the water in the junction box causes open circuit of the excitation coil.

Electromagnetic flowmeter system alarm solution:

The solution is also very simple, the user can take the multimeter to check the excitation circuit on and off to determine, the specific terminal for the EXT + and EXT - these two terminals, measuring whether there is resistance, determine the size of the resistance to determine the reasons for the excitation line disconnected . Specific judgment criteria: The excitation coil resistance will not exceed 200Ω. There is also a case of a battery-powered electromagnetic flowmeter. Its excitation alarm is to detect the resistance of the excitation coil. Although excitation alarm will occur, it will not affect the measurement result. The user can solve this phenomenon by setting the excitation mode.

Misunderstanding 2: electromagnetic flowmeter empty pipe alarm is electromagnetic flowmeter failure?

ATC alarm: FGP - Fluid Alarm

Intelligent electromagnetic flowmeters generally have an empty tube detection function 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 smart electromagnetic flow meter can detect an empty pipe state, and when the empty pipe state is detected, the analog output and digital output signal of the meter. Both are 0, and the meter flow display is also 0.

The significance of the electromagnetic flowmeter empty tube alarm is that the customer can know the flow state of the medium in the measurement pipeline in real time, even the empty tube full state, especially for those opaque pipe segments, for the user to determine the fluid in the pipe is the most convenient and quick, It embodies the humanized and intelligent design of smart flowmeters. Therefore, the electromagnetic flowmeter empty pipe alarm is not a malfunction of the electromagnetic flowmeter, but it faithfully reflects the fluid condition in the measuring pipe. Of course, the user can choose to prohibit this setting as needed.

Misunderstanding 3: Electromagnetic flowmeter upper limit alarm and flow lower limit alarm is electromagnetic flowmeter overrange?

FQH - upper limit alarm

FQL - lower limit alarm

Flow upper and lower limit alarms are calculated according to the percentage of the flowmeter's range. This parameter reflects whether the user exceeds the set range in a specific flow range and does not indicate that the electromagnetic flowmeter exceeds the measurement range and can only be regarded as electromagnetic flow. The percentage of the set range is set here because the range of the electromagnetic flowmeter can be set, and sometimes it is to increase the resolution of the output signal of the electromagnetic flowmeter. Therefore, for the upper and lower limit alarm phenomenon of the electromagnetic flowmeter, the user can According to the actual needs of the measurement can be set, if you feel it is not necessary, you can choose to close, mainly for a customer-specific flow of a prompt. The specific solution is as follows:

The upper and lower limit alarms indicate that the output current and output frequency or pulse are out of limits. After the flow range is changed to larger and smaller, the upper and lower limit alarms are revoked.

Changzhou Chengfeng electromagnetic flowmeter , the domestic high-end flow meter brand, to meet customer needs first, quality first, allowing customers to use the rest assured. The customer's affirmation of Changzhou Chengfeng is the driving force for our progress. We are striving to develop new technologies, improve product performance, adopt high-quality materials, and meticulously adhere to the quality of our products, and ensure the passing rate of production testing is 100%. Cheng Feng instrument, only to do fine, customer satisfaction is our driving force.

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