Sewage Treatment

1) Pressure gauge. In the design of water treatment process, it is often necessary to set up a pressure instrument at the inlet and outlet of the equipment to measure the pressure and observe whether it meets the process requirements, so as to facilitate the process debugging operation. According to the process requirements, you can choose local pressure gauges, remote differential pressure transmitters or pressure switches that transmit digital signals, etc., and then select pressure instruments with different principles according to the characteristics of the medium, operation/design pressure, accuracy requirements, etc., as well as instrument accessories.

2) Temperature gauge. In water treatment projects, temperature instruments are mainly installed in pipelines or equipment. As the name suggests, the contact thermometer can directly contact the temperature measurement object, but the disadvantage is that the response time is long, and it is difficult to measure the temperature of the moving object. Non-contact thermometers can solve the shortcomings of contact thermometers, but their disadvantages are that the measured temperature is the surface temperature, and the measurement error is large.

3) Flow meter. Flow refers to the amount of fluid flowing through the effective section per unit time. According to the way the quantity is expressed, it can be divided into volumetric flow rate and mass flow rate. The corresponding flow units are m3 /h, L/h and kg/h, etc. The output signal of the volumetric flowmeter reflects the volumetric flow, mainly electromagnetic flowmeter, vortex flowmeter, ultrasonic flowmeter, etc., and the mass flow rate of the fluid measured by these flowmeters should be equipped with a density transmitter (usually a pressure and temperature transmitter) for compensation and converted into mass flow. In order to maintain the accuracy of measurement, the flow meter often has the requirements of straight pipe section before and after installation, and the selection should be carried out according to various conditions such as accuracy requirements, medium characteristics, flow rate range, pipe diameter and installation method.

4) Liquid level instrument. The liquid level instrument is often used for liquid level measurement in the tank and pool or the material level measurement in the chemical silo in sewage treatment to reduce the occurrence of irrigation phenomenon and avoid safety accidents. In terms of application, according to the different measuring media, it can be divided into liquid level gauge (gas-liquid), level gauge (gas-solid) and interface gauge (liquid-liquid, solid-liquid). Liquid level gauges commonly used in water treatment processes include magnetic flap level gauges, ultrasonic level gauges, pressure level gauges, etc. In practical application, the selection of the liquid level instrument can be determined according to the measurement range, pressure, temperature, viscosity or whether there are bubbles of the field medium. When the liquid level is too low or too high, the pump will be stopped or started to ensure the stable operation of the process system.

5) Analytical instrumentation. Analytical instruments are mainly divided into two categories: gas analyzer and liquid analyzer, gas analyzer includes gas chromatography analyzer, infrared analyzer, thermal conductivity analyzer, etc.; There are categories of liquid analyzers, such as pH meters, conductivity analyzers, water quality analyzers, viscometers, etc. Water quality analyzers are commonly used in water treatment processes to measure whether the water quality of a certain process section meets the design requirements. Some water quality analyzers have a variety of measurement principles to choose from, such as TOC analyzers, which can choose the principle of ultraviolet-persulfate dual oxidation, the principle of high-temperature combustion catalytic oxidation, etc., which need to be analyzed according to the water quality and select the corresponding working principle.