Whenusingthe electromagnetic flowmeter, it will sometimes occur the alarm phenomenon, and the customer will naturally think whether it is the failure of the flowmeter.In fact, we need specific analysisaccording to different conditions, the alarm phenomenon of electromagnetic flowmeter often have the following three errors:
1. Excitation alarm and system alarmof electromagnetic flowmeter.
In fact, excitation alarm and system alarm is the same, intelligent electromagnetic flowmeter intelligent detection of the excitation signal alarm, whenencountered such a situation,it mostly because the pipe vibration is too large,or in the course of the use, the box lead into the water damp excitation coil open.
Solution
Just take the multimeter to detect the“on and off“of theexcitation line. Specificterminals are EXT + and EXT,and measuring whether there is resistance, by determining the size of resistance to determine the cause of the excitation line disconnected.
2. Empty tube alarmof the electromagnetic flowmeter.
Intelligent electromagnetic flowmeter generally have empty pipe detection, and it needs no additional electrodes.When the user selects the empty pipe alarm, when the fluid in the pipeline is lower than the measuring electrode, the intelligent electromagnetic flowmeter can detect an empty pipe state, at this time, the analogand digital output signal of the instrument are all “0”.
Then main significance of electromagnetic flowmeter empty tube alarm is that the customers can real-time stateof themedia within the pipeline,especially for those opaque pipe section. Therefore, the electromagnetic flowmeter empty pipe alarm is not indicate afailure of electromagnetic flowmeter, but faithfully reflect thestate of the measured fluid within thepipeline.Of course, the user can choose to prohibit this setting.
3. The upper and lower limit alarmof the electromagnetic flowmeter.
The flow upper and lower limit alarms are calculated according to the percentage of the flowmeter’s measuring range. This parameter is a concrete reflection of whether thespecificflow range is beyond the settingflow rangevalue.And it can not explain the electromagnetic flowmeter beyond the measuring range, can only be regarded asthe setting percentage of the range of electromagnetic flowmeter .This setting is emphasized because themeasuring range of the electromagnetic flowmetercan be set.Sometimes in order to improve the output signal resolutionof electromagnetic flowmeter, the user can set the actual needs of the measurementfor the electromagnetic flowmeter upper and lower alarm phenomenon. If you feel that there is no need, you can alsoclosethe alarm.
Solution
The upper and lower limit alarms indicate that the output current and the output frequency or pulse are all out of limits.The flow range to change the large and small, the revocation of the upper and lower limit alarm.
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Post time: 21-09-21