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Precision And Calibration Of Pressure Transmitters
Jul 20, 2017

The degree of closeness between the precision, the calculated value, or the estimate and the truth (or is considered to be true). Accuracy, uncertainty, and error refers to the actual value of the process and the difference between the values shown by the sensor. The drop in precision is called a shift in calibration drift or calibration. The precision of the pressure transmitter depends on how long it is calibrated to the Rochester transmitter to maintain its calibration accuracy.

The design of pressure transmitters usually makes the relationship between input and output linear. Therefore, the calibration curve (XY axis) for the pressure transmitter on the Cartesian coordinate system is a straight line, represented by the following formula:

y = mx + b (1)

where M is the slope of a straight line, and B is its interception. The slope is also known as gain, and interception is also known as 0 offset or deviation. The measurement range of the transmitter is minimal to maximum pressure (for example, 0 to 2500 lbs). Indicates the pressure of the input range (for example, 0 to $number psi), the range of the electrical signal output (for example, 4 to the MA or 1 to 5 V). The minimum pressure for the calibration of the Ross-Monte transmitter is called 0 and is synonymous with offset and deviation. The transmitter usually calibrated the ideal pressure measurement range (for example, the range 0 to $number PSI pressure transmitter has 500 to $number psi). This is called the calibration range or span of the transmitter.

The initial precision of the calibrated pressure transmitter determines the accuracy of the calibration standard, which is based on the accuracy of the calibration process. The precision is usually expressed as a percentage of the range. The initial calibration of industrial pressure transmitters (including absolute and differential pressure transmitters) is usually referred to as a back-up factory calibration.