Several Skills of Differential Pressure Transmitter Calibration Method

Differential pressure transmitter is one of the matching transmitters with orifice flowmeter. Its performance is on-site liquid crystal display, which can continuously display the differential pressure value. Many users are asking, if the on-site differential pressure value is not accurate, is it possible? What about tuning? This question has come to the fore. As an intelligent differential pressure transmitter, it can be adjusted automatically and manually. Here are a few tips for calibrating differential pressure transmitters. The adjustment of the differential pressure transmitter depends on the situation. If it is the on-site reason, it is useless to find a master to adjust it. First, you must check the reason and then make a conclusion. If it is indeed a differential pressure transmitter, it can be adjusted completely. 1 shown. The effect of the differential pressure transmitter in Figure 1 is to transmit the differential pressure signal to the electronic equipment, and then flash the differential pressure on the computer. -5V or 4-20mA) Such electronic signal differential pressure and voltage or current are linearly connected, usually in direct proportion. Therefore, the output voltage or current of the differential pressure transmitter increases with the increase of the differential pressure, thus The result is a connection between differential pressure and voltage or current. The differential pressure transmitter converts the controlled quality measured by the measuring element into the signal type required by the controller. The difference between differential pressure transmitter and differential pressure transmitter: differential pressure transmitter is about the pressure unit of gas or liquid is Pa or bar; differential pressure transmitter usually also refers to gas and liquid pressure, but there are also about differential pressure. The pressure is also called a load cell, and the unit is Newton or kilogram (force) or ton. The differential pressure transmitter measures the pressure difference between two (in the container) gases or liquids as a relative quantity; the differential pressure transmitter measures the size of the pressure of a single (in the container) gas or liquid, which is a certain . From the application point of view, there are two input nozzles for differential pressure to introduce two samples to be tested and then obtain their differential pressure; for differential pressure, only one nozzle is required. Protection of the differential pressure transmitter: The differential pressure transmitter is requested to be checked once a month and once a week, mainly to eradicate the dust in the instrument, carefully check the electrical components, and check the output current value frequently. The inside of the differential pressure transmitter is weak, and must be isolated from the outside strong electricity. Regarding the service life of differential pressure transmitters, suppliers now provide life guarantees for high-end and high-performance differential pressure transmitters, but it is only a matter of time before these guarantees are extended to low-end products in practice. In the not-too-distant future, the leading technology available today only in high-performance differential pressure transmitters will be widely used in low-end differential pressure transmitters, when clear lifetime assurances will be commonplace. (Extended reading...Pressure transmitter) Differential pressure transmitters are widely used in factories. In order to ensure their normal operation and accuracy, it is necessary to check and calibrate them regularly. A method for on-site calibration without revoking the pressure guiding tube is now introduced. (Extended reading...Temperature transmitter) 1. For the calibration of the differential pressure transmitter, first adjust the damping to the zero state, first adjust the zero point, then add the full pressure to adjust the full scale, so that the output is 20mA, and adjust it on site Talking is fast, here we introduce the flexible adjustment method of zero point and span. When the zero point is adjusted, it has almost no effect on the full scale, but when the full scale is adjusted, it has an effect on the zero point. When there is no relocation, the effect is about 1/5 of the range adjustment amount, that is, when the range is adjusted up by 1mA, the zero point will move up by about 0.2mA. ,vice versa. For example: the input full scale pressure is 100Kpa, the reading is 19.900mA, and the range adjustment potentiometer makes the output 19.900+(20.000-19.900)*1.25u003d20.025mA. The range adds 0.125mA, then the zero point adds 1/5*0. 125u003d0.025. Adjust the zero-point potentiometer to make the output 20.000mA. After the zero-point and full-scale adjustment are normal, check each scale of the base to see if it is out of tolerance? Fine-tune if necessary. Then carry out the adjustment work of relocation, linearity and damping. (Extended reading...Temperature transmitter) 2. Calibration of intelligent differential pressure transmitter It is impossible to calibrate the intelligent differential pressure transmitter with the above-mentioned conventional method, because this is the structure of the HART differential pressure transmitter principle is chosen. Since the intelligent differential pressure transmitter is between the input pressure source and the generated 4-20mA current signal, in addition to machinery and circuits, there is also the operation of the microprocessor chip on the input data. Tuning is therefore different from conventional approaches. (Extended reading...Temperature transmitter) In the practice, the manufacturer also explained the calibration of the intelligent differential pressure transmitter, such as ABB's differential pressure transmitter, for the calibration there are: 'set rangeQuantitative range' and 'fine-tuning'. Among them, the 'set range' operation is mainly completed by the digital setting of LRV.URV, while the 're-range' operation requires connecting the differential pressure transmitter to a standard pressure source, and guided by a series of instructions, The practice pressure is directly sensed by the differential pressure transmitter and the value is set. The initial and final setting of the range directly depends on the actual pressure input value. But see that while the analog output of the differential pressure transmitter is accurate to the input value used, the digital readout of the process value will show slightly different values, which can be calibrated by trimming.
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