Magnetic Weir Meter for Seepage Monitoring
Magnetic weir meter is suitable for long-term measurement of rivers, lakes, reservoirs, dams and other weir tank water level, is an effective monitoring equipment to monitor water level and flow changes. The measuring weir meter adopts magnetostrictive sensor as liquid level measurement. It has the functions of high resolution, good stability, reliable performance, fast response speed, linear measurement, absolute position output, non-contact continuous measurement, never wear, no calibration and regular maintenance of the sensor, RS485 digital output signal, simple and convenient installation, long working life, etc., and synchronous measurement of the temperature of the embedded point.
Overview
The magnetostrictive liquid level is composed of a measuring rod, an electronic bin and a non-contact magnetic floating ball sleeved on the measuring rod. The measuring circuit sends out an initial pulse, which is transmitted in a waveguide. The pulse meets the magnetic floating ball to generate a return pulse. The electronic energy pickup mechanism senses the return pulse, measures the time difference between the two pulses, and accurately measures the liquid level value.
The water level change △L in the weir trough has a linear relationship with the measured value of the weir meter, and the calculation formula is
where: △L-water level change in weir trough, unit: mm;
F-real-time measured value of weir meter, unit: F;
FOReference value of weir meter, unit: F;
K-sensor coefficient of weir meter, unit: mm/F.
When the measured value ΔL of the water level of the measuring weir meter is positive, it means that the water level of the weir tank is increased relative to the reference value.
When the measured value ΔL of the water level of the measuring weir meter is negative, it means that the water level of the weir tank is lower than the reference value.
The temperature change in the normal working range has little effect on the measured value of the sensor, and the temperature correction coefficient is less than the minimum reading, and no temperature correction is required in actual use. The weir meter has intelligent identification function, and the output signal is RS485 digital quantity, which directly displays the engineering physical quantity and does not need to be calculated for field use.
attached flow calculation formula:
a) Flow calculation formula of right-angle triangular weir:
Where: Q-flow, in m³/s;
h-weir head, unit: m.
B) Rectangular weir flow calculation formula:
Where: Q-flow, unit: m ³/s
B- weir width, in m;
h-weir head, unit: m;
p-distance from top plate of weir to top of weir, unit is m.
c) Trapezoidal flow calculation formula:
Where: Q-flow, in m³/s;
B- Weir bottom width, m;
h-weir head, unit: m.
Characteristic:
- High resolution, good stability
- Reliable performance and fast response
- Convenient installation and easy maintenance
- Large power, lasting life
- Absolute position output, non-contact continuous measurement
Application scenarios:
- Water level monitoring of weir trough in rivers and lakes
- Water level monitoring of reservoir weir tank
- Water level monitoring of water conservancy dam
Specifications
|
Specifications and Models |
MAS-LSYJ |
|
Measurement Range |
0mm ~ 500mm (range optional) |
|
Sensitivity |
0.01mm |
|
Measurement Accuracy |
<0.1%F.S |
|
Repetition Error |
≤ ± 0.002% F.S |
|
Protection Level |
IP67 |
|
Output Signal |
RS485 |
|
Working Temperature |
-40 ℃ ~ 85 ℃ |
|
Debugging Mode |
Address code and baud rate self-setting |
|
Temperature Coefficient |
≤ 0.007%F.S/℃ |
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