First, the pressure sensor
The device can sense the specified measured fluid pressure value and convert it into a usable output signal according to a certain rule. Usually composed of sensitive components and conversion components. When outputting an unspecified standard signal, it is generally called a pressure transmitter.
Second, the type of pressure
Absolute pressure: The pressure value measured when the reference pressure is vacuum is absolute pressure, usually referred to as absolute pressure.
Gauge pressure: When the reference pressure is local atmospheric pressure, the measured pressure value is gauge pressure. The gauge pressure is referred to as pressure at a positive time, and when the gauge pressure is negative, it is referred to as a negative pressure or a vacuum degree. The greater the absolute value of the negative pressure, that is, the smaller the absolute pressure, the greater the vacuum
Differential pressure: When the measured pressure is felt at both ends of the sensor or transmitter, the difference between the pressures at both ends is called the differential pressure.
Third, the characteristic parameters of the pressure sensor
Measurement range: The range of the measured value within the allowable error limit becomes the measurement range.
Upper limit value: The high value of the measurement range is called the upper limit of the measurement range.
Lower limit value: The low value of the measurement range is called the lower limit of the measurement range.
Range: The algebraic difference between the upper and lower limits of the measurement range is the range
Accuracy: the degree of agreement between the measured measurement and the true value
Nonlinear
Repeatability: Consistency between the results obtained from consecutive measurements of a given test under the same measurement conditions
Creep: The change in output over a specified period of time when measured and all environmental conditions remain constant
Hysteresis: The maximum difference in the output when the measured value increases or decreases within the specified range.
Incentive: The external energy applied to make the sensor work properly. Usually voltage or current. Voltage or current applied. The voltage or current of the pressure is different, and the output parameter of the sensor is also different. Therefore, some parameters, such as zero output, upper limit output, drift, etc., should be measured under the specified excitation conditions.
Zero drift: Zero drift is the change in the zero output value at specified time intervals and under standard conditions. Zero drift due to changes in ambient temperature becomes thermal zero drift
Overload: usually refers to the maximum value of a measurement that can be applied to a sensor transmitter without causing permanent changes in performance.
Stability: The ability of the sensor transmitter to store, test or use under specified conditions and maintain the original characteristic parameters after a specified period of time.
Reliability: refers to the ability of the sensor cargo transmitter to perform the required functions within the time specified under the specified conditions.
Working temperature: refers to the transmitter can reach various technical indicators and functional ambient temperature range
Storage temperature: refers to the temperature range in which the transmitter does not damage during long-term storage without power supply.
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