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Detailed explanation of various performance parameters of pressure sensor


source:[Gravimetric blender]   release time:2021-04-05 11:50:20




Pressure sensor refers to a device that can sense pressure and convert pressure changes into electrical signal output. It is the most common sensor in automated equipment, and it is also the nervous system in automated force measurement equipment. To use the pressure sensor correctly, you must first understand the parameters of the pressure sensor.

The pressure sensor mainly has the following parameters:

1. Capacity:

Range refers to the rated load of the pressure sensor. The general unit is KGf, N, etc. If the measuring range is 100KGf, the measuring range of the sensor is 0-100KGf.

2. Sensitivity Rated output:

Sensitivity is the output signal coefficient of the pressure sensor, the unit is mV/V, the common ones are 1mV/V, 2mV/V, the full-scale output of the pressure sensor = working voltage * sensitivity, for example: working voltage 5VDC, sensitivity 2mV/V, full The range output is 5V*2mV/V=10mV. For example, the full range of the pressure sensor is 100KG, and the pressure is 100KG, the output is 10mV, and the pressure is 50KG is 5mV.

3. Non-linearity:

Non-linearity refers to the percentage of the maximum deviation between the straight line determined by the output value of no load and the output value at rated load and the measured curve of increased load to the rated output value. Theoretically, the output of the sensor should be linear. In fact, it is not. Non-linearity is the percentage deviation from the ideal. The unit of non-linearity is: %FS, non-linear error = range * non-linearity. For example, if the range is 100KG, non-linearity is 0.05% FS, and the non-linear error is: 100KG*0.05%=0.05KG.

4. Repeat ability:

Repeatability error means that under the same environmental conditions, the sensor is repeatedly loaded to the rated load and unloaded. The percentage of the maximum difference between the output value at the same load point and the rated output during the loading process.

5. Creep:

Creep refers to the percentage of the pressure sensor output change over time to the rated output under the condition that the load remains unchanged and other test conditions remain unchanged. It is generally taken as 30 minutes.
6. Hysteresis lagging:
Hysteresis means that the pressure sensor is gradually loaded from no load to the rated load and then gradually unloaded. The percentage of the maximum difference between loading and unloading output at the same load point to the rated output value.
7. Zero output zero balance:

Under the recommended voltage excitation, the output value of the pressure sensor is the percentage of the rated output when there is no load. Theoretically, the output of the pressure sensor should be zero when there is no load. In fact, the output of the pressure sensor is not zero when there is no load. There is a deviation. The zero output is the percentage of the deviation.

8. Input resistance:

Input impedance refers to the impedance value measured from the input end of the pressure sensor (the red and black lines of the pressure sensor are red and black) when the signal output terminal is open and the sensor is not pressurized.

9. Output resistance:

The output impedance refers to the impedance measured from the signal output terminal (green and white lines for the pressure sensor) when the input terminal of the pressure sensor is short-circuited and the sensor is not pressurized.

10. Insulation impedance:

Insulation resistance refers to the DC resistance value between the circuit of the pressure sensor and the elastomer.

11. Operation Temp range:

The operating temperature range means that the pressure sensor's performance parameters will not produce permanent harmful changes within this temperature range.

12. Compensated temp range:

The temperature compensation range means that within this temperature range, the sensor's rated output and zero balance have been rigorously compensated so as not to exceed the specified range.

13. Temperature effect on zero:
The influence of zero point temperature refers to the influence of changes in ambient temperature on the zero point of the pressure sensor. It is generally expressed as the percentage of the zero balance change to the rated output when the temperature changes by 10°C, and the unit is: %F.S./10°C.

14. Temperature effect on out of sensitivity temperature drift:

Sensitivity temperature drift refers to the change in sensitivity of the pressure sensor caused by changes in ambient temperature. It is generally expressed as the percentage of the rated output of the sensitivity change caused by a 10°C change in temperature, and the unit is: F.S./10°C.

15. Safe Load Limit:

Safety overload means that the pressure sensor will not be damaged in this load, but it cannot be overloaded for a long time.
16. Ultimate overload:

The limit overload refers to the limit value of the pressure sensor load.
17. Excitation recommend:
Excitation voltage refers to the working voltage of the pressure sensor, generally 5-12VDC.[Gravimetric blender]