Pressure sensor for water, gas, air for G1/4
A sensor with standard 1/4 '' plumbing thread can be connected to the smart-MAC D105 universal counter for measuring water or air pressure up to 1.2 MPa / 12 bar / 175 psi.
- connect the black wire of the sensor to terminal 1: GND (Ground or -5V)
- connect the red wire of the sensor to terminal 6: + 5V
- connect the yellow sensor wire to terminal 5: ADC
Connection diagram pressure sensor to smart-MAC D105
Dashboard widget settings
Add a widget indicator, chart or table to the board.
Choose your smart-MAC D105 device
In the section "Arithmetic operation" select the function f (x):
At the output of the sensor, the voltage varies between 0.5 - 4.5V for pressure in the range 0 - 12 bar.
Accordingly, the voltage at the output of the sensor varies within 4V, and at 1V there are 3 bars.
In the section "Arithmetic operation" select the function f (x) and write down the function for calculating the pressure in the units you need:
d.ADC > 0.5 ? (d.ADC-0.5)*3 : 0
d.ADC > 0.5 ? (d.ADC-0.5)*3*0.1 : 0
d.ADC > 0.5 ? (d.ADC-0.5)*3*0.986923 : 0
Millimeters of mercury [mm Hg Art.]
d.ADC > 0.5 ? (d.ADC-0.5)*3*750.06 : 0
Pound per square inch [psi]
d.ADC > 0.5 ? (d.ADCx-0.5)*3*14.5038 : 0
Pressure sensor calibration.
Normally, the pressure sensor does not need to be calibrated. But if you have also a control pressure gauge and you really want the pressure on the sensor to match your pressure gauge, then you can build a more accurate linear relationship equation for two control points.
Record the voltage at the ADC input at low pressure and at high pressure. Knowing the value of pressure - voltage at two control points, use the halyard to build a linear relationship equation.
Set up notifications on the device and control the built-in relay.
To configure notifications on the D105 device and automatically control the built-in relay according to the pressure level, it is necessary to determine the formula for calculating the voltage at the analog input at the corresponding pressure level.
Vout = ( BAR + 1.5) / 3
BAR - the pressure level in bars, at which an alert should come or a relay is activated;
Vout - the voltage at the analog input, at the appropriate pressure.
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