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Appendix E: External Power Sources
The EXT terminals of the datalogger can be used to provide an external power source to the logger. The
external power source however, must be chosen with care. The source voltage cannot be greater than 30
VDC and must fall within the input voltage range of each sensor attached to the datalogger.
To connect an external power source to the datalogger, thread the power source cable through an enclosure
strain relief and attach wires to EXT terminals. Before inserting wires into terminals you may need to
loosen terminal screws. Insert the black wire into either of the – (ground) terminals and tighten until secure.
Insert the red wire into the + (power) terminal and tighten until secure.
The battery that was included with the GL400 will operate in parallel with the external. Thus, a supplemen-
tal 12V source, such as a solar panel, may be added to increase the battery life. If this method is chosen the
external source must be diode protected from the battery voltage. The battery does not need to be protected,
this allows the battery to remain charged while the external source has power. CAUTION: The enclosure
must be vented or gasses could build up inside the case causing a rupture.
Alternatively, the 12V battery can be removed from the enclosure and the datalogger can be connected ex-
clusively to the external power source. This method does not provide a battery backup for the logger to
continue logging, however there is a battery backup to retain the data already collected.
Global Water ● (800)876-1172 ● www.globalw.com
External Power Sources
insert black
insert red
to negative
to positive
E
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