The principle of Global Water electromagnetic flowmeter

Case introduction

The measurement principle of the American Global Water electromagnetic flowmeter does not depend on the flow characteristics. If there is a certain amount of turbulence and vortex in the pipeline in the non-measurement area (such as: elbow, tangential flow restriction or a half-open upstream stop valve) is not relevant for measurement. If there is a steady eddy current in the measurement area, it will affect the stability and accuracy of the measurement.

At this time, the American Global Water electromagnetic flowmeter should take some measures to stabilize the flow velocity distribution: 1. Increase the length of the front and rear straight pipe sections 2. Use a flow stabilizer 3. Reduce the cross-section of the measuring point. 1． Requirements for the external environment 1.1. The flowmeter should avoid being installed in places where the temperature changes greatly or is subject to high-temperature radiation from the equipment. If it must be installed, heat insulation and ventilation measures must be taken. 1.2． The flow meter is installed indoors. If it must be installed outdoors, it should be protected from rainwater, flooding and sun exposure.

Moisture-proof and sun-proof measures must be taken. 1.3. The flowmeter should avoid being installed in an environment containing corrosive gases. When it must be installed, ventilation measures must be taken. 1.4. In order to facilitate installation, maintenance and upkeep, there must be ample installation space around the flow meter. 1.5. The installation site of the flow meter should avoid magnetic fields and strong vibration sources. If the pipe vibration is large, there should be supports to fix the pipe on both sides of the flow meter. 1. 2. Pipeline electromagnetic flowmeter 2.1. Requirements for straight sections In order to improve the effects of eddy currents and flow field distortion, there are certain length requirements for the straight pipe sections before and after the flowmeter is installed, otherwise it will affect the measurement accuracy (a rectifier can also be installed, and try to avoid being close to the regulating valve and half-open valve) installed later). 2.2. Requirements for process pipes The flowmeter has certain requirements for the process pipes upstream and downstream of the installation point, otherwise the measurement accuracy will be affected. a. The inner diameter of the upstream and downstream process pipes is the same as the inner diameter of the sensor, and should meet: 0.98DN≤D≤1.05DN (where DN: sensor inner diameter, D: process pipe inner diameter) b. The process tube and sensor must be concentric, and the coaxial deviation should not be greater than 0.05DN2.3.

Requirements for a bypass pipe: In order to facilitate the maintenance of the flow meter, a bypass pipe must be installed for the flow meter. In addition, for heavily polluted fluids and the flow meter that needs to be cleaned but the fluid cannot be stopped, a bypass pipe must be installed. a. Facilitate the maintenance of flow meter b. For heavily polluted fluids, c. The flow cannot be stopped and the flow meter needs to be cleaned 3. Installation requirements for plug-in electromagnetic flowmeter 3.1. Requirements for straight pipe sections Inlet/outlet straight pipe section: the entrance should be ≥10×DN; the outlet should be ≥5×DN3.2. Requirements for grounding points: In order to make the instrument work reliably, improve measurement accuracy, and not be interfered by external parasitic potentials/sensors should be well grounded, and the grounding resistance should be less than 10. (If the metal pipe is well grounded, there is no need to install a special grounding device) American Global Product Description of Water Electromagnetic Flowmeter: The WMX101 Series Flange Type Electromagnetic Flowmeter is a replacement for your old 4 to 10-inch industrial machinery turbine or propeller flowmeter. Since electromagnetic flowmeters have no moving parts and have electrodes that prevent fouling, the flowThe gauge performs well and requires less frequent maintenance in applications where debris obstructs the propeller gauge. These electromagnetic flowmeters have no rotors that stop spinning or bearings that wear out. The WMX101 series flange type electromagnetic flowmeter is also designed for the smallest straight pipe run requirements, which is great when the space between the meter and the elbow is very small.

Principle of American Global Water electromagnetic flowmeter: The electronic components of the WMX series flange type electromagnetic flowmeter adopt a sturdy NEMA 4X aluminum housing with a 2-line LCD that clearly displays the flow rate and totalizer. The display housing of the industrial electromagnetic flowmeter is tamper-proof. The optional IP68 (NEMA 6P) rated enclosure is suitable for applications where the magnetic flowmeter will be exposed to water depths up to 9.8 ft (3 m) for extended periods of time. The American Global WaterWMX101 electromagnetic flowmeter has an external power supply of 8-32 Vdc and a maximum current of 30 mA (see note in specifications). The magnetic flowmeter comes with a tamper-proof sealed power/pulse output cable. Two lithium 3.6V "AA" batteries provide auxiliary power in the event of a power failure, allowing the electromagnetic flowmeter to continue recording flow and totals without interruption during power outages. If external power losses are infrequent, the battery life of the electromagnetic flowmeter may exceed 10 years. The electromagnetic flowmeter's 20-foot power cord also provides a pulse output that can be used with a variety of devices such as the FT420 4-20mA converter and remote display, PLC, telemetry system, or data logger. Electromagnetic flowmeters come standard with high pulse rates (for use with 4-20 mA converters); additional pulse rates are optional. If the electromagnetic flowmeter requires a 4-20 mA signal, a pulse can be added to the analog converter.

The American Global WaterWMX104 electromagnetic flowmeter is a battery-powered instrument used when pulse output is not required or line power is unavailable. Two lithium-ion 3.6V "D" batteries provide power to the electromagnetic flowmeter and can be replaced with approximately 1 year of life with continued use, or depending on the duty cycle. If pulse output is required, optional input/output cables can be installed on the electromagnetic flowmeter. Rate and total indication are standard on both US Global Water magnetic flowmeter models. Electromagnetic flowmeters are customer selected and factory set. If no units are selected at the time of purchase, the magnetic flowmeter's display units will be set to GPM for flow and US Gallons for total flow. These devices cannot be changed on the electromagnetic flowmeter in the field. If you want a backup device to display the electromagnetic flowmeter supports the following options: Rate: MGD, Liters/minute, Liters/second, CFM, CMH, Megaliters/day; US Global Water Electromagnetic Flowmeter Applications: Filtration Systems Pump Stations Municipal Water/ Wastewater Industrial Water/Wastewater Cooling Tower Water Treatment Well Usage Report NOTE: In chemical injection applications, the chemical injection point must be placed in the electricalFar enough downstream or upstream of the magnetic flowmeter to allow optimal mixing of the fluid before it reaches the flowmeter.

Specifications of American Global Water electromagnetic flowmeter: Tube size: 4, 6, 8 or 10 inches Flow range: 4" GPM (0.75-63L/s) 6" GPM (2-151.4L/s) 8" GPM 3.8-277.6 L/s) 10" GPM (6-441.6 L/s) Accuracy: 10% of maximum flow to 100% of reading + 1% of reading + cutoff 2% of reading to 10% of maximum flow Fittings: AWWA 150 lb Drilling Pressure: 150 psi (10.3 bar) Operating Pressure Operating Temperature: -10° to 130°F (-12° to 55°C) Storage Temperature: -40° to 158°F (-40° to 70 °C) Materials: Body: Welded steel, epoxy coated Liner: Dual durometer rubber Electronics housing: Die cast aluminum, powder coated Electrodes: 316 stainless steel Rate display: in GPM (standard), MGD, liters per minute, liters /sec, CFM, CMH, Mega Liters/day Totalizer display: Gallons, Gallons : 8-32 VDC at 30 mA, with auxiliary battery for continuous operation during power failure 104: 2 Lithium 3.6V "D" battery, replaceable, 1 year continuous life Output Signal: 101: Current Absorbing Pulse , Opto-isolated, 30 Vdc, max 10 mA 104: Pulse output only available when adding DC30 output cable Pulse frequency: HF (default); 10 units/pulse; 100 units/pulse; 1000 units/pulse HF Pulse: 4" 16.362 pulses/gallon (4.323 pulses/liter) 6" 6.307 pulses/gallon (1.666 pulses/liter) 8" 3.344 pulses/gallon (0.883 pulses/liter) 10" 2.150 pulses/gallon (0.568 pulses/liter) empty Pipe Inspection: Hardware/Software, Conductivity Based Environmental: NEMA 4X Standard, (IP68/NEMA 6P Option) Dimensions/Weight: