Pressure sensor
Technical data: Explained in the section of the operating principle of the pressure sensor.
Represents the equivalent circuit of a pressure sensor.
Represents the resistance value Rin between Vcc and GND (between ② and ⑤) when ① and ⑥ on the equivalent circuit diagram are shorted.
Represents the difference between the output from +OUT and the output from -OUT.
It represents the midpoint potential difference between the midpoint potential from +OUT and the midpoint potential from -OUT under pressure under certain conditions. At our company, the applied voltage is based on 5V. The output voltage is proportional to the applied voltage.
It represents the output voltage when no pressure is applied (0kPa).
It represents the difference between the output voltage and the offset voltage when the rated pressure is applied.
FS=Vr-Vo (mV)
r: Rated pressure (kPa) Vr: Output voltage (mV) when rated pressure is applied
When the rated pressure is applied from the state of no pressure applied it represents the value that indicates the deviation of the output voltage at 1/2 rated pressure as a ratio of the output span voltage.
Pl={(Vr/2-Vo)-(FS/2)}/FS×100 (%FS)
r/2: 1/2 rated pressure (kPa)
Vr/2: Output voltage (mV) when 1/2 rated pressure is applied
Apply up to the rated pressure from the state of no pressure applied. After that, it shows the amount of deviation when returning to the state of no pressure applied as a ratio of the output span voltage.
Vo1: Offset voltage (mV) after applying rated pressure
Ph=(Vo1-Vo)/FS×100 (%FS)
Of the offset voltage differences between the min temperature and the reference temperature, and between the reference temperature and the max temperature, the value with the largest absolute value is expressed as the ratio of the output span voltage at the reference temperature.
t1: Min temperature (°C)
t2: Max temperature (°C)
Vo(t1): Offset voltage at min temperature (mV)
Vo(t2): Offset voltage at max temperature (mV)
Vo(25): Offset voltage (mV) at reference temperature
FS(25): Output span voltage (mV) at reference temperature
⊿Vo = MAX( |Vo(t1)-Vo(25)| , |Vo(t2)-Vo(25)| )/FS(25)×100(%FS)
Of the output span voltages at the min temperature, reference temperature, and max temperature, the difference between the max and min values is expressed as the ratio of the output span voltage at the reference temperature.
FS(t1): Output span voltage (mV) at min temperature
FS(t2): Output span voltage (mV) at max temperature
⊿FS = [MAX( FS(t1) , FS(25) , FS(t2) )-MIN( FS(t1) , FS(25) , FS(t2) )]/FS(25)×100(%FS )
1Pa is the state where a force of 1N (=1kg・m/s2) is applied per 1m2.
1 Pa = 1 N/m2
The relationship with atmospheric pressure is 1atm = 101325Pa.
1kgf/cm2≒98.1kPa is also used as another unit.
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