Calibration of metal tube rotameter gauges

Abstract: The calibration information of the metal tube float flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. It is impossible to calibrate the metal tube rotameter by the conventional method, which is determined by the structural principle of the transmitter. Because the metal tube rotameter is between the input pressure source and the generated 4-20mA current signal, in addition to mechanical, electrical, and microprocessing. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the calibration article of the metal tube float flowmeter. It is impossible to calibrate the metal tube rotameter by the conventional method, which is determined by the structural principle of the transmitter. Because the metal tube rotameter is between the input pressure source and the generated 4-20mA current signal, in addition to machinery and circuits, there is also a microprocessor chip that operates on the input data. Therefore, the adjustment is different from the conventional method. In fact, the manufacturer has also explained the calibration of the metal tube rotor flowmeter. The series transmitters produced by our company have the following calibrations:“set range”,“Weight range”,“fine-tuning”points. in“set range”Operation is mainly through LRV. URV digital settings to complete the configuration work, and“Weight range"Operation requires connecting the transmitter to a standard pressure source, guided by a series of commands, with the transmitter directly sensing the actual pressure and setting the value. The initial and final setting of the range is directly dependent on the actual pressure input value. However, see that although the analog output of the transmitter is correctly related to the input value used, the digital readout of the process value will show a slightly different value, which can be calibrated by trimming. Since each part of the metal tube rotameter needs to be adjusted individually and must be adjusted jointly, the actual calibration can be carried out as follows: First, make a 4-20mA fine-tuning to correct the D/A converter inside the transmitter , since it does not involve sensing components, no external pressure signal source is required. Do a full fine-tuning again to make the 4-20mA, digital readout match the actual applied pressure signal, so a pressure signal source is required. Finally, make the re-quantity range, and make the analog output 4-20mA match the external pressure signal source through adjustment, and its function is exactly the same as that of the zero (Z) and range (R) switches on the transmitter shell. Some people think that the range of the metal tube rotameter can be changed as long as the HART Communicator is used, and the adjustment of the zero point and the range can be performed without the need to input a pressure source, but this method cannot be called calibration, only called calibration. for“set range”. True calibration requires a standard pressure source input to the transmitter. Because range adjustment (LRV, URV) is not a calibration without the use of a standard, output adjustment (transmitter conversion circuit) ignoring the input part (pressure input to the transmitter) is not a correct calibration. Furthermore, the relationship between pressure and differential pressure detection components, A/D conversion circuit and current output is not equal. The purpose of calibration is to find out the changing relationship of the three. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Calibration of Metal Tube Float Flow Meters'

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