Hydronix Hydro-Probe Configuration And Calibration Manual page 16

Chapter 2
Output Variable 1 and 2
2.2
These define which sensor readings the analogue output will represent and has 10 options.
2.2.1 Raw Unscaled
This is the raw unfiltered unscaled variable. A Raw Unscaled value of 0 is the reading in
air and 100 would relate to a reading in water. As no filtering is applied to this variable it
should not be used for process control. This output can be used for logging during initial
sensor installation.
2.2.2 Raw Unscaled 2
If set this will output the alternative measurement mode as configured for the sensor (see
Chapter 2 Section 8 for more information about alternative measurement modes). No
filtering will be applied.
Note: This mode is not available in all sensors please see the technical
specification in the relevant installation guide for more details.
2.2.3 Filtered Unscaled
Filtered Unscaled represents a reading which is proportional to moisture and ranges from
0 – 100. An unscaled value of 0 is the reading in air and 100 would relate to a reading in
water.
2.2.4 Filtered Unscaled 2
The Filtered Unscaled uses the second measurement mode configured in the sensor.
Note: This mode is not available in all sensors.
specification in the relevant installation guide for more details.
2.2.5 Average Unscaled
This is the 'Raw Unscaled' variable processed for batch averaging using the averaging
parameters.
'Average/Hold'.
averaged. When the digital input is low, this average value is held constant.
2.2.6 Filtered Moisture %
The Filtered Moisture % is scaled using the Filtered Unscaled value using the A, B, C and
SSD coefficients.
Filtered Moisture %= A x (F.U/S)² + B x (F.U/S) + C – SSD
These coefficients are derived solely from a material calibration and so the accuracy of the
moisture output is dependent upon the accuracy of the calibration.
The SSD coefficient is the Saturated Surface Dry offset (Water Adsorption Value) for the
material in use and allows the displayed percentage moisture reading to be expressed in
surface (free) moisture only.
2.2.7 Raw Moisture %
This is the Raw Moisture % variable before any filtering or averaging. As Filtering has not
been applied it is not recommended to use this variable for process control.
16 Configuration and Calibration Guide HD0679 Rev 1.2.0
To obtain an average reading, the digital input must be configured to
When this digital input is activated, the Raw Unscaled readings are
Configuration
Please see the technical