Humidity Sensor
A Humidity Sensor reads the environmental humidity and depending on the sensor type used (either relative, specific or absolute), will output a humidity value to be used in the ECU to be used in table axis or tuning. If a physical sensor is not installed, but the humidity is known, a humidity input can be configured and calibrated with a dial and entered manually. Enabling calculated channels in the Settings node displays all types of humidity together (relative, specific and absolute). Definitions of each of these humidity types are as follows:
Relative Humidity: The water content of the air as a percentage of the maximum possible amount for the current temperature and pressure.
Absolute Humidity: The mass ratio of water to total mass (air and water) within a given volume of air.
Specific Humidity: Commonly known as Water Grains (short for water grains per pound of dry air). The mass ratio of water to dry air within a given volume.
This node allows the calibration of the humidity sensor against its voltage output. The calibration data you enter will depend on the Humidity Type set in the Wiring node.
Settings
Calculated Humidity Channels - Enables all three humidity channels. These channels are calculated using barometric pressure (where a barometric pressure sensor is enabled). In the case that a barometric pressure sensor is not available, the pressure at sea level (101.3 kPa) will be used for estimate calculations.
Humidity Channels Update Conditions - The conditions by which the Humidity channels will update. Note: it can take up to 30 seconds for humidity sensors to return an accurate reading. Select which ECU channel and its conditions will start the timer.
Display
Display Maximum - Sets the humidity at which the Humidity sensor gauge and bar displays end. This also set the maximum value allowed to be used in settings and tables.
Diagnostics
This node allows the enabling of high and low voltage DTCs as well as a Maximum Humidity DTC for the Humidity sensor.
A DTC severity can be set for each voltage and humidity, which will trigger an Engine Protection level for the relevant setting.
Wiring
This node allows you to assign the input for the Humidity sensor.
Humidity sensors use an Analog Input. Any available AVI can be used. The Pull Up is typically disabled.
Humidity Type - Sets the type of sensor connected to the ECU.
Relative (percentage) - Select when the input is a relative humidity sensor.
Specific (water grains) - Select when the input is a specific humidity sensor.
Absolute - Select when the input is an absolute humidity sensor.
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