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Configuration
29. The sensor configuration is now complete. Now enter the logger’s site name in the Site Name field in the System
section. The site name is the text that appears in the header of downloaded data files.
30. Save the configuration to disk by clicking the “Save to Disk” button. Enter a suitable name for your configuration. The
file can then be opened and sent to other loggers requiring the same sensor configuration at a late date.
31. Finally, send the configuration to the connected iRIS. To do this, click the “Send Config” button.
32. The progress can be seen on the status bar at the bottom of the iLink window.
33. The process is now complete. If you want to edit or save the configuration in an already configured iRIS, the reverse
operation can be done by using the “Retrieve Config” button. The configuration can then be edited and sent back to
the iRIS and/or saved to disk.
3.7
Analogue Input Scaling
This section explains the recommended procedure to use when scaling an analogue input (voltage or current). It makes
use of the scaling calculator provided in the iLink program. However, the calculation can also be done manually using this
formula. V = Input V, EU = Engineering Units (scaled output e.g. metres).
Multiplier = (Maximum EU – Minimum EU) / (Maximum V – Minimum V)
Offset = Maximum EU - (Multiplier * Maximum V)
For more information, see the following subsection:
§
Example: A 4-20mA Water Level Sensor
3.7.1
Example: A 4-20mA Water Level Sensor
In this example, we have a water level instrument connected to the iRIS Analogue Input 1. This instrument is designed to
provide a nominal 4-20mA signal for a 0-10 metre water level range. However, in the real world, most instruments are
not exact and a small difference in actual signal may occur.
The internal current sink resistor in the iRIS is 100Ω (theoretically giving 2V at 20mA). An external resistor of
a different value can be used if desired. E.g. 250Ω will give 5V at 20mA.
for more information on connecting the internal resistor to the input.
When using the internal resistor, it is important to configure the iRIS’ input to 4-20mA mode, see section
on how to do this. The iRIS is calibrated to account for the manufacturing tolerance of the
internal resistor and uses this to convert from volts to milliamps.
1. When an analogue input is select as a sensor source the Scaling Calculator button should be displayed:
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Summary of Contents for iRIS Under Cover
Page 1: ...iRIS Under Cover User Manual ...
Page 13: ... 2022 HyQuest Solutions 13 Installation Figure 2 Mounting Diagram ...
Page 108: ... 2022 HyQuest Solutions 108 Appendices 8 1 Declaration of Conformity ...
Page 115: ... 2022 HyQuest Solutions 115 Appendices ...
Page 117: ...www hyquestsolutions com 2022 HyQuest Solutions 29 06 2022 ...
