Chapter 3 Electrical Installation And Communication; Installation Guidelines; Analogue Outputs - Hydronix Hydro-Probe XT User Manual

Chapter 3
Hydronix supplies cable 0975A for use with the Hydro-Probe XT and this is available in different
lengths. Any extension cable should be connected to the Hydronix sensor cable using a suitable
screened junction box. See Chapter 8 for cable details.
The Hydro-Probe XT is also directly backward compatible with older 0090A and 0975 cables. When
connecting to a 0090A cable it is not possible to use the 2
Probe XT.
It is recommended to allow the sensor to stabilise for 15 minutes after applying power before use.

1 Installation guidelines

Ensure that the cable is of a suitable quality (see Chapter 8).
Ensure that the RS485 cable is wired into the control panel. This can be used for diagnostic
purposes and takes the minimum of effort and cost to connect at the time of installation.
Route the signal cable away from any power cables.
The sensor cable should only be grounded at the sensor end of the cable.
Ensure that the cable screen is not connected at the control panel.
Ensure that there is continuity of the screen through any junction boxes.
Keep the number of cable joins to a minimum.

2 Analogue outputs

Two DC current sources generate analogue signals proportional to separately selectable
parameters (e.g. Filtered Unscaled, Filtered Moisture, Average Moisture, etc). See Configuration
in Chapter 4 or the Hydro-Com User Guide HD0682 for further details. Using the Hydro-Com or
direct computer control, the output may be selected to be:
4-20 mA
•
0-20 mA - 0-10 V output can be achieved using the 500 Ohm resistor supplied with the
•
sensor cable.
• Compatibility – this allows the Hydro-Probe XT to be connected to a Hydro-View II unit.
Electrical Installation and Communication
analogue output provided by the Hydro-
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