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Hangzhou Liance Automation Technology Co., Ltd
Selection Guide for Intelligent Sewage Electromagnetic Flow Meter
Date: 2024-08-22Read: 5
We know that intelligent sewage electromagnetic flow meters are commonly used for measuring aqueous solutions in industrial production processes. So, what should we pay attention to when using intelligent sewage electromagnetic flow meters? How should we correctly choose intelligent sewage electromagnetic flow meters? Below, we will briefly introduce the selection and usage precautions of intelligent sewage electromagnetic flow meters.
Correct selection method of lining material for intelligent sewage electromagnetic flowmeter
The lining material should be selected based on the corrosiveness, wear resistance, and temperature of the tested medium:
1、 Natural rubber (soft rubber)
1. Good elasticity, wear resistance, and tensile strength
2. Resistant to corrosion from general weak acids and bases
3. Water and sewage measurement
2、 Acid resistant rubber (hard rubber)
Can withstand corrosion from hydrochloric acid, acetic acid, oxalic acid, ammonia water, phosphoric acid at room temperature, as well as 50% sulfuric acid, sodium hydroxide, and potassium hydroxide, but is not resistant to corrosion from strong oxidants
Measure general acid, alkali, and salt solutions
3、 Neoprene rubber
1. Excellent elasticity, high tensile strength, and good wear resistance
2. Resistant to corrosion from low concentration acid-base and salt solutions, but not resistant to corrosion from oxidizing media
<80℃；
Measure water, sewage, mud and slurry
4、 Polyurethane rubber
1. Excellent wear resistance
2. Poor acid and alkaline resistance
<40℃
Coal slurry, mud, and slurry for measuring neutral and strong wear
5、 Polytetrafluoroethylene (PTFE)
1. Boiling resistant hydrochloric acid, sulfuric acid, nitric acid, aqua regia, concentrated alkali, and various solvents
2. Good wear resistance, poor adhesion performance
-80～+180℃；
Measurement of concentration, strong corrosive solutions with concentrated alkali, and sanitary media
Diameter selection of intelligent sewage electromagnetic flowmeter
The diameter of the transmitter is usually chosen to be the same as that of the pipeline system. If the distribution system needs to be designed, the diameter can be selected based on the range and flow rate of the manifold. For intelligent sewage electromagnetic flow meters, a flow rate of 2-4m/s is more suitable. In special circumstances If there are solid particles in the liquid, considering the wear situation, the commonly used flow velocity can be ≤ 3m/s. For fluids that are prone to adhering to the pipe wall, the flow velocity can be ≤ 2m/s. After the flow velocity is determined, the transmitter diameter can be determined based on it.
The range of the transmitter can be selected based on two principles: one is that the instrument's full range is greater than the expected high flow value, and the other is that the normal flow value is greater than 50% of the instrument's full range to ensure a certain measurement accuracy.
Conduct preliminary selection
1. Determine whether to use an intelligent sewage electromagnetic flowmeter (to be determined by the salesperson) based on the name and properties of the measured medium learned
Attention: The intelligent sewage electromagnetic flowmeter can only measure the flow rate of conductive liquids, while gases, oils, and the vast majority of liquids are not included in the general conductive liquid examples
2. Determine the electrode material based on the properties of the dielectric material learned
Attention: The company generally provides four types of electrodes: stainless steel, Hastelloy, titanium, and tantalum. The selection of which electrode should be based on the properties of the medium and relevant information manuals
3. Determine whether to use rubber or PTFE lining based on the temperature of the medium learned (to be determined by the marketer)
Attention: The temperature resistance of rubber should not exceed 80C;
PTFE can withstand a temperature of 150C and can instantly withstand 180C;
Urban sewage can generally be treated with rubber lining and stainless steel electrodes
4. Based on the learned medium pressure, select the flange specification for the body (to be determined by the marketer)
Attention: The specification of electromagnetic flanges is usually that when the diameter is from DN10-250, the rated pressure of the flange is ≤ 1.6Mpa;
When the diameter ranges from DN250-1000, the rated pressure of the flange is ≤ 1.0Mpa;
When the actual pressure of the medium is higher than the corresponding range of pipe diameter pressure mentioned above, it is a special order, but the high pressure shall not exceed 6.4Mpa
5. Determine the conductivity of the medium
Attention: (1) The conductivity of the intelligent sewage electromagnetic flowmeter shall not be lower than 5uS/cm
(2) The conductivity of tap water is about tens to hundreds of uS/cm. Generally, boiler soft water (deionized water) is conductive, while pure water (highly distilled water) is non-conductive
(3) The conductivity of gases, oils, and the vast majority of liquids is much lower than 5uS/cm, making them non-conductive.
After reading the description of the appeal, I believe you have a general understanding of the selection of intelligent sewage electromagnetic flow meters. Of course, if you want to better understand the use of intelligent sewage electromagnetic flow meters, a good way is to directly contact the manufacturer Hangzhou Liance, inform the Liance technical engineer of the working conditions, and let the engineer select the appropriate product configuration and installation requirements for you.