What to do if the electromagnetic flowmeter receives no signal during measurement

General considerations for the use of electromagnetic flowmeters Liquids should have the required conductivity for measurement and require a substantially uniform conductivity distribution. Therefore, the flow sensor should be installed so as to avoid places where conductivity is not easily generated. For example, liquid medicine is added near the upstream of the sensor, and the liquid addition point is preferably located downstream of the sensor. When a glass rotameter is used, the sensor tube must be filled with liquid. When mixed, their distribution should be generally uniform. The liquid should be at the same potential as ground and must be grounded. If the process piping is made of plastics and other insulating materials, the transport liquid generates friction and static electricity and other causes, resulting in a potential difference between the liquid and the ground.

How to deal with electromagnetic flowmeters when measuring signals are not received or the signal is too weak? If the pipe is too close to the wall, the probe can be installed at a pipe diameter with an oblique angle instead of being installed on a horizontal pipe diameter. The installation of the electromagnetic flowmeter requires the Z method to install the probe. Verify that the tubing is full of fluid.

Electromagnetic flowmeters have no moving parts and no flow blockers. They will not cause pressure loss, and they will not cause problems such as wear and blockage. The electromagnetic flowmeter is a volumetric flow measuring instrument that is not affected by the temperature, viscosity, density, and conductivity of the measured medium during the measurement process. The electromagnetic flowmeter has no mechanical inertia and reacts sensitively. It can measure instantaneous pulsating flow and has good linearity. Therefore, the measurement signal can be directly converted into a standard signal output by the converter. Carefully select the dense part of the pipe and polish the light enough, apply a sufficient coupling agent to install the probe; carefully move each probe carefully near the mounting point to find the maximum signal point, and the glass rotor flowmeter prevents fouling due to the inner wall of the pipe or Because the local deformation of the pipe causes the ultrasonic beam to reflect out of the expected area and miss the installation point that can receive a stronger signal; the metal pipe with serious fouling of the inner wall can use the hitting method to make the scaling part fall off or crack, but it should be noted that This method sometimes does not help the transmission of ultrasonic wave because of the gap between the scale and the inner wall.

Food Additives Refers to the production of food by the food manufacturer in the process of adding some chemicals, used to change the color of food, smell, or adjust the food taste and prolong the preservation time (preservatives, antioxidants), but some will Leading to cancer, such as many of the meat material added by some of the substances in the stomach due to protein, stomach acid, additives generated by the interaction of nitrite, can lead to physiological and chronic lesions. These chemicals are known as food additives.


main effect


Food additives have greatly contributed to the development of the food industry, and known as the soul of the modern food industry, which is mainly to the food industry to bring many benefits, its main role is as follows:


1. Preserving to prevent deterioration such as: preservatives can prevent food spoilage caused by microorganisms, extend the shelf life of food, but also have to prevent the pollution caused by microbial poisoning. Another example: antioxidants can prevent or delay the oxidation of food deterioration, to provide food stability and resistance to storage, but also to prevent the possible harmful oil automatic oxidation of the formation. In addition, can also be used to prevent food, especially fruits, vegetables, enzymatic browning and non-enzymatic browning. These are the preservation of food is of a certain significance.


2. Improving the sensory properties of food The color, smell, taste, shape and texture of food are important indicators of food quality. Appropriate use of colorants, colorants, bleach, edible spices and emulsifiers, thickeners and other food additives, can significantly improve the sensory quality of food to meet people's different needs.


3. Maintain or improve the nutritional value of food in food processing properly add some of the natural nutritional range of food nutrition enhancer, can greatly improve the nutritional value of food, which prevent malnutrition and nutritional deficiencies, promote nutritional balance, improve People's health level is of great significance.

4. Increased variety and convenience of food The market now has as many as 20,000 kinds of food for consumers to choose, although most of these food production through a certain packaging and different processing methods, but in the production process, some color , Fragrant, taste with the whole product, mostly to varying degrees to add the coloring, aroma, seasoning and even other food additives. It is these a lot of food, especially the convenience of food supply, to people's lives and work to bring great convenience. 

Now commonly used food pigments include two categories: natural pigments and synthetic pigments. Natural pigments come from natural, mainly extracted from plant tissue, and also include some pigments from animals and microbes. Synthetic pigment refers to the use of artificial chemical synthesis of organic pigment, mainly in coal tar separated from the aniline dye made of raw materials. In the course of a long period of Food Additive reporting process, because people do not recognize the harm of synthetic pigments, and synthetic pigments and natural pigments compared with bright color, strong coloring, stable nature and cheap, many countries in the The food processing industry generally uses synthetic pigments. With the development of society and the improvement of people's living standards, more and more people in the use of synthetic food in the food will not cause harm to human health questioned. At the same time, a large number of research reports that almost all of the synthetic pigment can not provide nutrients to the human body, some synthetic pigment and even endanger human health. Eat a fine snack, fast food lunch, fragrant hot dog, glance at the printing of exquisite packaging food on the nutritional table, you will find that each food has additive ingredients. It is understood that the conversion of fat, refined cereal products, salt, high fructose syrup four components in the processing of food is the most common, these ingredients harm the human health. Some if there are too much harm, such as: citric acid, aspartame, sodium Finland white pigment, vanillin, potassium ... basically no harm, as long as it is added But not excessive


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