Hydronix Hydro-Hub, User Manual

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Calibration Chapter 7
Hydro-View / Hydro-Hub User Guide HD0864 Rev 1.0.0 59
2.5
Adding a Calibration Point
Averaging the output of the sensor over a period of time is essential for representative sampling
in most applications. In the case of a Hydro-Probe mounted in a sand bin, once the gate opens
the sand starts to flow until the gate closes. As the readings vary during this time the most
reliable way in which to obtain a representative Unscaled value is by continuously averaging
during the flow.
2.5.1 Averaging Mode
The Averaging Mode used while calculating the Average Unscaled can be set to either ‘Raw’
or ‘Filtered’ (Page 50). For applications where mechanical apparatus, such as mixer paddles
or screws, pass over the sensor and affect the reading, the use of the ‘Filtered’ value will
remove the peaks and troughs in the signal. If the material flow is stable, for example, when
measuring at the output from a silo or on a conveyor belt, the averaging should be set to
‘Raw’.
See the Hydronix Sensor Configuration and Calibration Guide HD0679 or the
appropriate sensor user guide for more details on how to set the averaging
functionality for specific applications.
2.5.2 Automatic Averaging
Digital input 1 can be used to determine when to start the averaging. For a bin installation
the sensor input may be generated from the bin-gate switch to give a +24VDC input when
the gate is open. The same set-up can be used for other installation such as conveyor belts.
A manual switch can be installed to indicate when the sensor should start averaging.
In both cases the configuration of the sensors digital input has to be set to ‘Average/Hold’
for this purpose (See page 49).
See the Hydronix Sensor Electrical Installation Guide HD0678 or the appropriate
sensor user guide for more details on how to wire the digital input.
2.5.3 Remote Averaging
If the installation is without an input that can switch to control the averaging function, Hydro-
Net Software has the facility to manually select the start and stop period of averaging. This
is called ‘Remote Averaging’.
If the averaging is started manually, using the Hydro-Net software, any signals applied to
digital input 1 will be ignored during this period.
Figure 90: Remote Averaging