hello
i try to mesure the vacuum value
i have HK1100C for the pressor 0 - 12 bar
can i take it for the vcuum value
or now you a sensor like HK1100C 0 - 5v for the vacuum mesure
thaks
Google "vacuum sensor".
i am here for help
i know google and i know how i use it thanks for your replie but i dont need it
i want a reference
if you have links to the data sheet that would help.
but, if you can power it with 5VDC, and 20mA,
and it outputs 0.5 to 4.5vdc
then you can read it easily with any model of Arduino.
the ADC can read 0 to 5 volts and will break that down into 1024 steps.
you loose a little resolution by loosing one half volt on each end.
what I do not know is why you say vacuum when this is a high pressure, 0-1.2 MPa / 0-150PSI range device.
it is not rated for vacuum.
0-1 bar would be a better range for sensing (partial) vacuum, not 0-12 bar.
If you want a vacuum sensor you need to define the lowest pressure you need/want to distinguish from zero. Is this 10mbar or 1mbar or 0.01mbar or 0.0000000001mbar? All of this is possible but requires the right sensor. Also you need to define the absolute pressure accuracy you want to achieve.
The standard 0-1bar or even 0-12bar sensors get very inaccurate in the lower pressure range. If you want good measurements below 50mbar you need a dedicated vacuum pressure sensor.
There are so called "gauge sensors" and absolute sensors. Gauge sensors measure pressure with respect to the ambient pressure (sometimes this is called overpressure). If a gauge sensor measures 0 bar, it does not mean that it measures perfect vacuum. Rather it means that the pressure on the input port of the sensor is the same as the ambient pressure (close to 1 bar). There is little doubt that your sensor is a gauge sensor which measures from ambient pressure to 12 bar overpressure and it is not suitable to measure vacuum. To measure vacuum, you have to buy a vacuum sensor.