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1. What flowmeter is better for detecting groundwater?
Electromagnetic flowmeter is the first choice for groundwater flow detection. According to specific working conditions, ultrasonic open channel flowmeter and clamp type ultrasonic flowmeter can be selected. Vortex flowmeter is only suitable for extremely clean groundwater scenarios.
1. Electromagnetic flowmeter: The most preferred type.
Adaptation advantages: It is not affected by the density, viscosity, and temperature of groundwater, and can stably detect groundwater containing sediment and suspended solids. It will not cause accuracy degradation or blockage problems due to medium impurities, and is the standard measuring equipment for most pressurized pipeline groundwater intake scenarios in China.2. Selection subdivision:
(1) Integrated electromagnetic flowmeter: suitable for newly built pipeline intake ports for conventional excavation and installation, with stable measurement accuracy and easy daily maintenance;
;(2) Plug in electromagnetic flowmeter: suitable for existing pipelines that need to be renovated in the later stage, without the need to cut off the pipeline. It can be connected by simply opening holes in the pipe wall, with low installation cost and short cycle.
3. Installation requirements: It is necessary to ensure that the measuring pipe section is full of pipe flow, otherwise it will significantly reduce the measurement accuracy. The underground water pump pumping pipeline network can basically meet this requirement.
.II. Special selection for open channel groundwater 1 Ultrasonic open channel flowmeter: For outdoor open channel groundwater scenarios, such as natural overflow channels and shallow groundwater drainage channels, the flow rate is calculated by measuring the water level in the channel and combining it with channel section parameters. It does not require contact with fluids and is not affected by water flow front impurities. It is suitable for outdoor monitoring scenarios where pipeline flowmeters cannot be installed.
III. Other alternative options and limiting conditions 1 Clamp on ultrasonic flowmeter: suitable for existing underground pipeline scenarios that are inconvenient for excavation and renovation. It can be installed directly on the outer wall of the pipeline without cutting off the pipeline. It is only suitable for clean groundwater scenarios where the pipeline is full and there is no large amount of sediment attached to the inner wall. Vortex flowmeter: only suitable for groundwater scenarios with extremely clean and tidy water quality, with extremely high requirements for medium cleanliness. If the groundwater contains sediment impurities, it is easy to damage the detection components, and the applicable scenarios are very limited.
IV. Selection and Installation Safety Precautions 1 Principle of working condition matching: Electromagnetic flow meters are preferred for underground water transported by pressure pipelines, while ultrasonic open channel flow meters are preferred for underground water in open channels; 2. Water quality adaptation requirements: Groundwater with high sediment content is strictly prohibited from using vortex flow meters to avoid clogging and damage to detection components; 3. Safety of confined space operations: When installing a flowmeter in a closed underground well, ventilation and gas concentration detection must be carried out firs