Sewage flow meter

Sewage flow meterProduct Overview

An electromagnetic flowmeter consists of two parts: a sensor and a converter. It works based on Faraday's law of electromagnetic induction and is used to measure the volumetric flow rate of conductive liquids with a conductivity greater than 5 μ S/cm. It is an inductive instrument for measuring the volumetric flow rate of conductive media. In addition to measuring the volumetric flow rate of general conductive liquids, it can also be used to measure the volumetric flow rate of strong corrosive liquids such as strong acids and alkalis, as well as homogeneous liquid-solid two-phase suspensions such as mud, slurry, and pulp. Due to the many advantages of electromagnetic flowmeters, they are widely used for flow measurement in industrial sectors such as petroleum, chemical, synthetic, metallurgical, textile, papermaking, sugar production, water supply and drainage, environmental protection, food, municipal management, water conservancy construction, river dredging, and other fields.

Sewage flow meterMeasurement principle:

The working principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. The conductive medium inside the measuring tube is equivalent to a conductive metal rod in Faraday's test, with two electromagnetic coils at the upper and lower ends generating a constant magnetic field. When a conductive medium flows through, an induced voltage is generated. The induced voltage generated by measuring the two electrodes inside the pipeline. The measuring pipeline achieves electromagnetic isolation from the fluid and measuring electrode through non-conductive lining (rubber, Teflon, etc.), as shown in the figure.

Sewage flow meter Industrial sewage flow meterSewage flow meterProduct Features:
1. Measurement is not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity;
2. Measure the flow components inside the tube, with no pressure loss and low requirements for straight pipe sections;
3. The nominal diameter of the series ranges from dn15 to dn3000. There are multiple options for sensor lining and electrode materials;
4. The converter adopts a novel excitation method, with low power consumption, stable zero point, and high accuracy. The flow range can reach 1500:1;
5. The converter can be integrated or separated from the sensor;
6. The converter adopts a 16 bit high-performance microprocessor, 2x16 LCD display, convenient parameter setting, and reliable programming;
7. The flowmeter is a bidirectional measurement system equipped with three integrators: forward total, reverse total, and differential total; Can display. Zhuang, reverse flow, and have multiple outputs: current, pulse, digital communication hart；
8. The converter adopts surface mount technology (SMT) and has self checking and self diagnostic functions;

Sewage flow meter Industrial sewage flow meterSewage flow meterMain technical data:
Technical data of the whole machine and sensors

Instrument selection

Range confirmation

The flow rate of the measured medium in general industrial electromagnetic flowmeters should be between 2-4m/s. In special cases, the low flow rate should not be less than 0.2m/s and should not exceed 8m/s. If the medium contains solid particles, the commonly used flow rate should be less than 3m/s to prevent excessive friction between the lining and the electrode; For viscous fluids, the flow velocity can be chosen to be greater than 2m/s. A higher flow velocity helps to automatically eliminate the effect of viscous substances attached to the electrode, which is beneficial for improving measurement accuracy.

Under the condition that the range q has been determined, the size of the flowmeter diameter d can be determined based on the range of flow velocity v mentioned above, and its value can be calculated by the following formula:

q=πd2v/4
q: Flow rate (㎡/h) d: Inner diameter of pipeline v: Flow velocity (m/h)

The range q of the electromagnetic flowmeter should be greater than the expected flow value, while the normal flow value should be slightly greater than 50 of the flowmeter's full-scale scale.

Reference flow range of electromagnetic flowmeter