Differential pressure transmitters are widely used in petroleum, oil refining, oil blending, oil-water interface detection; in the food industry, it can be used in the production sites of grape juice, tomato juice, fructose syrup, vegetable oil and soft drink processing; dairy products industry; paper industry; black pulp , green pulp, white pulp, alkali solution test; brewing alcohol degree; chemical urea, detergent, ethylene glycol, acid-base and polymer density test. It can also be used in mining brine, potash, natural gas, lubricating oil, biopharmaceutical and other industries.
Reasons for static pressure error of differential pressure transmitters
1. For the differential pressure transmitter, the inspection of its differential pressure scale is generally completed in the state where the negative pressure chamber is open to the atmosphere. However, in the process of field operation, there is often such a problem. When the actual static pressure zero calibration of the transmitter is performed, it can be found that there is a difference between the zero position output when the negative pressure chamber is open to the atmosphere and the current zero position output value. of. Differential Pressure Transmitter Absolute Pressure Transmitter Pressure Transmitter Error Judgment
2. The main reason for this phenomenon is that the effective areas of the positive and negative pressure chamber diaphragms are different. When they are under the same pressure environment, it can be found that due to their different effective areas, the resultant force generated on the bellows is not equal to zero. In this case, it is easy to cause the occurrence of deviation in the position of the main lever, and the final result is the situation of zero drift.
how to solve the static pressure error of differential pressure transmitters
In the use of the differential pressure transmitter, once the static pressure error occurs, but it is not corrected in time, it will cause errors in the overall measurement results. After understanding this importance, corresponding countermeasures need to be taken. Differential Pressure Transmitter Absolute Pressure Transmitter Pressure Transmitter Error Judgment
1. The same static pressure is injected into the positive and negative pressure chambers of the pressure transmitter at the same time.
2. For the three-valve group of the transmitter, one of the high and low pressure valves should be opened and the other closed, and the balance valve should be opened.
3. Under the premise of not sure whether the positive and negative pressure chambers are full of the measured medium, it can be solved by exhausting or exhausting gas.
Usually the above method, the static pressure error of the transmitter can be effectively solved, so that the measurement accuracy of the differential pressure transmitter has been greatly improved.
