Pressure is one of the important parameters in industrial production. In order to ensure the normal operation of the production, the pressure must be monitored and controlled. Pressure is one of the important parameters in industrial production. In order to ensure the normal operation of the production, the pressure must be monitored and controlled. The following are commonly used terms for pressure sensor selection:
Pressure: The force acting perpendicular to the unit area. Physically known as "pressure."
Range: the pressure range. Refers to the sensor to measure how much pressure.
Media: Refers to the object being measured. Generally it is steam, water, oil, acid, alkali or a mixture.
Accuracy requirements: 0.5% 0.25% 0.1%
Differential pressure: the difference between any two related pressures. Usually indicated by D.
Absolute pressure: The pressure at which the absolute vacuum is used as a reference point. Usually indicated by A.
Gauge pressure: A pressure greater than or less than atmospheric pressure with reference to atmospheric pressure. Usually indicated by G.
Standard pressure: the pressure expressed as atmospheric pressure, the positive pressure greater than atmospheric pressure; the negative pressure less than atmospheric pressure Relative pressure: the pressure of the comparative object (standard pressure) Atmospheric pressure: refers to atmospheric pressure. Standard atmospheric pressure (1 atm) corresponds to a pressure of 760 mm mercury column. Vacuum: refers to a pressure state below atmospheric pressure. 1 Torr = 1/760 air pressure (atm)
Detection pressure range: refers to the sensor's adaptive pressure range.
Withstand pressure: When the pressure is restored to the detection pressure, the performance can not withstand the pressure.
Round-trip accuracy (ON/OFF output): When a pressure is increased or decreased at a constant temperature (23 ° C), the pressure change at the operating point obtained by removing the pressure value at which the output is reversed is removed by the full scale value of the detected pressure. value.
Accuracy: At a certain temperature (23 ° C), when zero pressure and rated pressure are applied, the value obtained by deviating from the value of the output current specified value (4 mA, 20 mA) is removed by the full scale value. Units are expressed in %FS.
Linear: The analog output varies linearly with respect to the detected pressure, but is biased compared to the ideal straight line. The value of this deviation is expressed as a percentage of the full scale value called linear hysteresis (linear): draw the ideal line between the output current (or voltage) value with zero voltage and rated voltage, and put the current (or voltage) The difference between the value and the ideal current (or voltage) value is obtained as an error, and the error value at the time of the pressure rise and the fall is obtained. The value obtained by removing the maximum value of the absolute value of the difference by the current (or voltage) value of the full scale is hysteresis. Units are expressed in %FS.
Hysteresis (ON/OFF output): The value obtained by removing the difference between the output ON point pressure and the OFF point pressure by the full scale value of the pressure is a hysteresis non-corrosive gas: a substance contained in the air (nitrogen, carbon dioxide, etc.) With inert gas (argon, helium, etc.)
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