Pressure is one of the important parameters in industrial production, in order to ensure the normal operation of production, the pressure must be monitored and controlled. The following are terms commonly used in the selection of pressure sensors:
Standard pressure
Atmospheric pressure as a standard for the size of the pressure, greater than atmospheric pressure is called positive pressure; less than atmospheric pressure is called negative pressure.
Absolute pressure
Absolute vacuum as the standard pressure size.
Relative pressure
The amount of pressure in relation to the object of comparison (standard pressure).
Atmospheric pressure
Refers to atmospheric pressure. Standard atmospheric pressure (1 atm) is equivalent to the pressure at a height of 760 mm mercury column.
Vacuum
Refers to a state of pressure below atmospheric pressure. 1Torr = 1/760 barometric pressure (atm).
Detection pressure range
Refers to the adaptable pressure range of the sensor.
Withstand Pressure
The tolerable pressure at which performance does not deteriorate when returned to the detection pressure.
Round trip accuracy
The change in pressure at the point of action when the pressure is increased or decreased at a certain temperature (23°C) by removing the pressure value at which the output is reversed from the full scale value of the detected pressure.
Accuracy
The value obtained by removing the deviation from the specified value of output current (4mA, 20mA) from the full scale value at a certain temperature (23°C) when zero pressure or rated pressure is applied. The unit is expressed in %FS.
Linearity
The analogue output varies linearly with respect to the detected pressure, but deviates from the ideal straight line. The value that expresses this deviation as a percentage to the full scale value is called linearity.
Hysteresis (Linear)
Drawing an ideal straight line between output current (or voltage) values using zero and rated voltages, finding the difference between the current (or voltage) value and the ideal current (or voltage) value as an error, and then finding the value of the error when the pressure rises and when it falls. The value obtained by removing the maximum value of the absolute value of the above difference from the full-scale current (or voltage) value is hysteresis. The unit is expressed in %FS.
Hysteresis
The value obtained by removing the difference between the output ON point pressure and OFF point pressure from the full scale value of pressure is hysteresis.
Non-corrosive gas
This refers to substances contained in air (nitrogen, carbon dioxide, etc.) and inert gases (argon, neon, etc.).