When the user uses the electromagnetic flowmeter, an alarm will occasionally occur, and the other party will naturally think of whether the flowmeter is malfunctioning? In fact, specific problems need specific analysis. The alarm phenomenon of electromagnetic flowmeters often has the following three misunderstandings:Misunderstanding 1: The electromagnetic flowmeter excitation alarm and system alarm are broken?System alarm: SYS——system excitation alarm, also used as excitation alarmIn fact, excitation alarm and system alarm are the same thing, sometimes called system excitation alarm, which belongs to the alarm of the excitation signal detected by the intelligent electromagnetic flowmeter. When the customer encounters such a situation, it is mostly due to excessive pipeline vibration, or In the course of use, the water in the junction box is caused by the open circuit of the excitation coil.Solution to the alarm of the electromagnetic flowmeter system:The solution is also very simple. Users can use a multimeter to detect the on-off of the excitation circuit. The specific terminals are EXT+ and EXT—these two terminals. Measure whether there is a resistance value, and determine the cause of the excitation circuit disconnection by judging the resistance value. . Specific criterion: The resistance of the excitation coil will not exceed 200Ω. There is also a battery-powered electromagnetic flowmeter. Its excitation alarm is detecting the resistance of the excitation coil. Although an excitation alarm will appear, it will not affect the measurement results. Users can solve this type of phenomenon by setting the excitation method.Misunderstanding 2: The electromagnetic flowmeter empty pipe alarm is a malfunction of the electromagnetic flowmeter?Empty pipe alarm: FGP-fluid empty pipe alarm intelligent electromagnetic flowmeters generally have empty pipe detection functions, and no additional electrodes are required. 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 signal of the instrument All are 0, and the flow rate display of the meter is also 0.The significance of the electromagnetic flowmeter empty pipe alarm is that the customer can know the flow state of the medium in the measuring pipe in real time, even the empty pipe full pipe state, especially suitable for those opaque pipe sections. It is the most convenient and quick for users to judge the fluid in the pipe. It embodies the humanized and intelligent design of the intelligent flowmeter. Therefore, the empty pipe alarm of the electromagnetic flowmeter is not a malfunction of the electromagnetic flowmeter, but a truthful reflection of the fluid condition in the measurement pipeline. Of course, users can choose to prohibit this setting as needed.Misunderstanding 3: The electromagnetic flowmeter flow upper limit alarm and the flow lower limit alarm are the electromagnetic flowmeter over-range?FQH——Flow upper limit alarmFQL-flow lower limit alarmThe upper and lower limit alarms of the flow rate are calculated according to the percentage of the flowmeter’s range. This parameter reflects whether the user’s specific flow range exceeds the set range. It does not mean that the electromagnetic flowmeter exceeds the measurement range, but can only be regarded as electromagnetic flow. The percentage of the range set by the electromagnetic flowmeter is emphasized here because the range of the electromagnetic flowmeter can be set. Sometimes it is to improve the resolution of the output signal of the electromagnetic flowmeter. Therefore, the upper and lower limit alarms of the electromagnetic flowmeter can be set according to the measurement. You can actually set it up. If you think it is not necessary, you can also choose to close it. It is mainly used as a reminder of the customer’s specific traffic.The specific solutions are as follows:The upper and lower limit alarms indicate that the output current and output frequency or pulse are all over the limit. After changing the flow range to large and small, the upper and lower limit alarms are cancelled.
Post time: 21-09-21