Instructions

UM-0085-B09 DT80 Range User Manual Page 286
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Grounding
Note: Protective earth must be installed for all of the installations where sensors and cabling is outdoors and is potentially subjected to
lighting strike.
Warning: Correct grounding provides a safe discharge path for large electrical currents which may occur due to lightning or electrical
faults. When installing the DT80, consideration must be given to proper grounding, particularly where sensor or antenna cabling is
outdoors, and therefore potentially subject to lightning strike.
Figure 118: Protective earth connection
Some DT80 models incorporate a protective earth connection. This is identified by the earth symbol enclosed in a
circle, as shown in Figure 107. Any ground point that is not
marked with this symbol is a functional earth, and is not
suitable for a protective earth connection.
• When installing a protective earth, note the following points:
• The earth connection must be made by a qualified electrician.
• The earth connector must be permanently connected to an earth ground as defined by the local wiring code.
• The protective earth cable and connector are not supplied with the logger. Use connector and cable with a
minimum wire size of 14 AWG that are certified as appropriate for the country of installation.
• Ensure the earth terminal screw is tightened properly to prevent accidental loosening.
Note: All sensor cables that may be subject to lightning must have a maximum current rating of no more than 5A.
Powering the DT80
Power Subsystem
The following block diagrams give an overview of the DT80's internal power subsystem.
Figure 119: DT80/ 82I/ 85 series 2 and 3 internal power subsystem