News

Self-calibration self-diagnosis and automatic range switching of the transmitter

The self-calibration self-diagnosis of the transmitter and the automatic error of the automatic range switching of the transmitter can be obtained through experiments. The relationship between this error and the independent variable is written into the A memory, and the automatic correction is realized by the single-chip microcomputer, which can greatly improve the accuracy of the meter. .
The self-diagnosis function of the meter is an important application of the 杌 technology. The diagnostic content of each type of instrument varies. Diagnostic content may vary greatly from the same type of instrument produced by different manufacturers, but it plays an important role in detecting faults and handling faults.
Range automatic switching is widely used in meters such as differential pressure flowmeters and electromagnetic flowmeters. By range switching, the range can be expanded and the accuracy can be improved/17].
Computer-rich logic functions make flow direction detection easy, so electromagnetic flowmeters, differential pressure flowmeters, and Coriolis mass flowmeters that can measure forward and reverse flow are born.
Management function
(1) Recording characteristic parameters in the transmitter
The characteristic parameters recorded in the memory of the transmitter can be much more comprehensive than the nameplate data. For example, the Smart 1151 differential pressure transmitter records the transmitter model, the sensor's maximum range, the minimum range, the isolation diaphragm material, and the filling. 19 kinds of data such as category and software version.
(2) Write repair record
Write a simple repair record in the transmitter for easy reference and not to be lost due to carelessness.
control function
Some instrument manufacturers have simple control algorithms in their microcontrollers, which allows the transmitter to have simple adjustments. A typical example is Smar's LD301 differential pressure transmitter, which is coupled with a throttling device and a regulating valve to achieve flow rate adjustment. The adjustment of the regulator parameters including the proportional gain, the integration time, the derivative time, and the output upper and lower limit limit value setting, the output change rate setting, and the adjustment of the positive and negative action settings are all completed through the communication link.

PREVIOUS：Description of the meter's quantitative timinNEXT：Description of flow measurement error caused