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Application of Ultrasonic Level Transmitters in Water and Sewage Treatment Procedures

Application of Ultrasonic Level Transmitters in Water and Sewage Treatment Procedures
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Application of Ultrasonic Level Transmitters in Water and Sewage Treatment Procedures - 1

Application of Ultrasonic Level Transmitters in Water and Sewage Treatment Procedures Ultrasonic level transmitters are commonly found throughout water and sewage treatment processes. Over the last few years, ultrasonic level has become the industry standard for most liquid level requirements. There is simply no other technology that can offer the same level of performance for the price of a typical ultrasonic level transmitter. Ultrasonic level instruments have evolved to come preconfigured with the functionality needed in the water and sewage treatment industry; for example, pump control, cycling and monitoring and open channel flow calculation with totalizer. Sewage Treatment Procedure Sewage treatment is generally divided into three procedures. Primary treatment (i.e. physical treatment) lets the raw sewage pass through the coarse grid then lifted by wastewater lift station, moves wastewater from a lower elevation to a higher elevation by the gravity, and then enters the grit chamber, the sewage after grit separation enters the primary sedimentation pool. Secondary treatment is that the effluent from primary sedimentation pool enters into biological treatment equipment, including activated sludge process and biofilm process. Then enters into secondary sedimentation pool, and the effluent is sterilized and discharged or classified into the third procedure, which includes biological nitrogen and phosphorus removal, coagulation sedimentation, sand filtration and activated carbon adsorption. A portion of the sludge from the secondary sedimentation tank flows back to the primary sedimentation tank or biological treatment equipment, and the rest goes into the sludge thickener, finally into the sludge digestion pool. After dehydration and dry, the sludge can be eventually used. Problems in Level Measurement In the three procedures of sewage treatment, level sensors play a significant role in every link, so as to ensure the orderly injection of wastewater, disinfectant and other chemical solutions as well as the smooth discharge after the third stage chemical treatment. Shenzhen Jiwei Automations Ltd.

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Application of Ultrasonic Level Transmitters in Water and Sewage Treatment Procedures - 2

The client has used float level indicators for the past years, but the cables were easy to twine, breakage, and the sensors frequently output false alarms, so the pumps had to be stopped for maintenance by manual care. In addition, the sewage is corrosiveness and explosive gas is released, plus the measuring space is limited, also with stir, foam, steam and condensation. Characteristics and Advantages of Ultrasonic Level Transmitter According to the special working conditions, Jiwei recommended Uson-21 Flameproof Ultrasonic Level Transmitter to the end user. Specifically, one set of Uson-21...

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Application of Ultrasonic Level Transmitters in Water and Sewage Treatment Procedures - 3

corrosive environment. ● High cost-effective ratio and low maintenance cost. ● EMC design of the product complies with IEC61000-4 (GB/T 17626.2) standard in EFT (LT: A), ESD (LT: A) and surge. Flameproof Certificate of Uson-21 Flameproof Ultrasonic Level Transmitter Selection and Application of Ultrasonic Level Transmitter A reasonable range should be clarified, larger range should be selected on steam or foam occasions. In weak acid or alkali environment, standard probe (such as ABS) is suitable, and anti-corrosion probe (such as PVDF) is for the strong corrosion area. In the case of...

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Application of Ultrasonic Level Transmitters in Water and Sewage Treatment Procedures - 4

switch, pipeline, etc. 3. Electromagnetic is an interference. The signal cable needs an independent threading pipe, and far away from power and lighting cables. To ensure good signal shielding, conductive steel pipe is recommended, and single point-grounding shall be adopted shielding layer, so as to avoid circuit potential difference interfering with sensor. 4. To prevent poor contact, do not leave a connector in the middle of signal wire, and the crimping part of the connecting terminal should be tightened, otherwise the contact resistance will be large. 5. To prevent signal line affect...

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