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Dec 05, 2018

# Basic parameters of pressure transmitter,and their interpretations

## ⅰ.Pressure sensor

A device or device that is capable of sensing a specified pressure value of the fluid being measured and, in accordance with certain rules, converting it into an output signal.It is usually composed of a sensing element and a conversion element.When the output of the standard signal is not specified, it is generally called pressure transmitter.

## Ii. Pressure type

Absolute pressure: the pressure value measured when referring to the vacuum pressure is the absolute pressure, usually referred to as the absolute pressure.

Gauge pressure: when referring to the local atmospheric pressure, the pressure value measured is the gauge pressure.Table pressure for positive referred to as pressure, table pressure for negative said negative pressure or vacuum degree.The larger the absolute value of negative pressure is, the smaller the absolute pressure is, the higher the vacuum degree is.

Differential pressure: when both ends of the sensor or transmitter feel the pressure under test, the difference between the two ends of the pressure is called differential pressure.

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## ⅲ.Characteristic parameters of pressure sensor

Measurement range: the range of the measured value within the allowable error limit becomes the measurement range.

Upper limit: the high value of the measurement range is called the upper limit of the measurement range.

Lower limit: the lower value of the measurement range is called the lower limit of the measurement range.

Range: the algebraic difference between the upper limit and the lower limit of the measurement range is the range.

Accuracy: the degree of consistency between the measured result and the truth value.

Repeatability: consistency between the results obtained by successive measurements of agreed subjects under the same measurement conditions.

Creep: change in output over a specified period of time when the measured and all its environmental conditions remain constant.

Hysteresis: within the specified range, the maximum difference in the output when the measured value increases or decreases.

Excitation: external energy applied to make the sensor work properly.Usually voltage or current.The applied voltage or current.The output value parameters of the sensor vary with the voltage or current, so some parameters, such as zero output, upper limit output, drift and so on, should be measured under the specified excitation conditions.

Zero drift: zero drift refers to the change in the output value of zero under the specified time interval and standard conditions.The zero drift caused by the change of ambient temperature becomes the thermal zero drift.

Overload: usually the maximum value of a measurement that can be added to a transducer or transmitter without causing a change in performance.

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