Differential Pressure: Module 1136_0

[jsmad]

I am trying to read the pressure from my 1136_0 pressure sensor using the code below (the second line converts the voltage ratio into "inches of H20").

getPressureVoltageRatio = channelPressureSensor.getVoltageRatio()
convertPressureInH2O = (20.073*getPressureVoltageRatio) - 10.037

However, the output gives me a non-zero number when there is no airflow. Is this normal? Do I need to "zero" the reading in the code and is there a native method for doing this or is the best way just to subtract the "zero airflow" output from my above formula?

[burley]

The sensor has a ±2kPa input range and an output of 0-5Vdc. If the sensor is measuring 0 pressure differential then the output will be 2.5V since that is the middle of the range.