urban clean water supply system electromagnetic flow meter
The application of electromagnetic flowmeter in urban water supply mainly includes
the following aspects:
1. Used as a settlement water meter: As a settlement water meter, the electromagnetic
flowmeter is an important settlement tool for the economic income of water supply
enterprises. Its management procedures include purchase, installation, calibration,
regular calibration, etc. to ensure the accuracy of measurement and the reliability of
data. Large-caliber electromagnetic flowmeters can transmit 24-hour GPRS real-time
data and set abnormal flow alarms; small-caliber mobile phone GSM timing collection
is used to achieve effective monitoring of data.
2. Regional metering: The electromagnetic flowmeter is installed in the urban pipe
network for regional metering. By measuring the water supply of the surrounding
large branches, the water consumption and recovery rate of the area are monitored
to help detect leakage or violations. Through regional metering, the total "recovery
rate" can be decomposed into each part, providing an assessment basis for target
management.
3. Water plant water volume metering: In the water plant, electromagnetic flowmeters
are used for water volume metering, providing an important basis for production and
management. The inlet electromagnetic flowmeter can provide real-time water production,
which is convenient for water purification and cost control; the outgoing water flowmeter
participates in the dispatch of the urban pipe network to ensure the appropriate water
supply pressure and provide a reference for the operation of the pump room unit.
The working principle and advantages of the electromagnetic flowmeter:
The electromagnetic flowmeter calculates the flow rate by measuring the induced
electromotive force generated when the conductive liquid flows in the magnetic field.
Its working principle is based on Faraday's law of electromagnetic induction and has
the following advantages:
1. High-precision measurement: no mechanical moving parts, accuracy can reach ±0.5%,
suitable for long-term stable monitoring
2. Low maintenance requirements: suitable for scenes with complex water quality, not
easy to clog
3. Bidirectional flow detection: can identify countercurrent or abnormal flow direction,
and assist in troubleshooting pipe network failures
4. Data real-time: supports multiple output methods, compatible with SCADA system,
and convenient for real-time monitoring and management
Installation and maintenance precautions:
1. Installation Installation conditions: Electromagnetic flowmeters have high requirements
for straight pipe sections, and it is difficult to install them in old water supply systems.
The flow characteristics can be improved by adding a rectifier tube.
2. Flow rate requirements: Too low water flow rate will affect the measurement accuracy,
especially at the end of the pipe network. The valves on both sides of the boundary should
be opened as much as possible.
3. Sensor cleaning: The sensor surface should be kept clean to avoid sludge affecting the
measurement accuracy. Scraper electrodes can be used and maintenance plans can be
formulated.
4. Water vapor interference: Water vapor in the pipeline will disturb the normal measurement.
It should be handled in time and an exhaust valve should be installed.
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