OTT HydroMet SUTRON XLINK 100, Operation & Maintenance Manual

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10.3.10 Measure Type: Internal Temperature
Internal Temperature measurements use a temperature sensor installed inside every unit. The reading
provided is in degrees Celsius. To convert from Celsius to Fahrenheit set the slope to 1.8 and the offset to
32.
10.3.11 Measure Type: Modbus
The system may be setup to collect data from Modbus sensors. Please see section 19 M
ODBUS
for details.
10.4 Processing Settings
10.4.1 Slope
See Offset below.
10.4.2 Offset
Every measurement is computed by taking the sensor reading, multiplying it by slope and adding offset to
it.
Measurement result = (sensor output)*slope + offset
Slope defaults to 1.0 and offset defaults to 0.0, meaning they will not affect measurement result by
default.
Traditionally, when using an analog sensor, slope and offset are required to convert the voltage output by
the sensor into desired units. The required slope and offset are provided by the sensor manufacturer.
More complex equation processing is supported. Please see Equations below. Slope
and offset are applied after equations.
The reading before slope and offset are applied is referred to as the raw reading. For example, if an analog
sensor were to provide a voltage of 2 volts, and the user had set up the Slope as 5 and Offset as 1, the final
reading would be 11 (2*5 + 1). The raw reading would be 2.
Calibrating a measurements results in changes to the offset setting.
10.4.3 Use Equation
Select “Use Equation” to allow an entry of the equation in the box below it. See the next section for
examples.
10.4.4 Equation
Data collected from sensors may be processed through an equation. If the reading provided by the sensor
needs more than just an offset and a slope applied, equations provide that functionality.
The field Use Equations can be set to enabled or to disabled. It determines whether equation processing is
to be applied to the raw data. The field Equation can be set to an ASCII string no longer than 128 bytes
(per measurement). That field contains the equation to be applied.