Powering the UTREL30-WiFi
UTREL30-WiFi User Guide
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Powering the UTREL30-WiFi
The UTREL30-WiFi is designed to be supplied via its USB socket from a commercially
available 5V USB power supply (5W). When supplied externally, the power symbol shows
on the display:
Some low-quality USB power supplies are unable to deliver sufficiently stable
power to the UTREL30-WiFi. Please use a power supply from a reputable source
that carries the UL or CE marking.
If the logger detects an unstable power source, the power symbol will flash
and the buzzer will sound.
In this case, the logger will not be powered by the external supply, but remain
powered by the AAA batteries instead. Please remove the supply and replace it
with one of better quality.
When you remove the external USB power the display briefly turns off.
The UTREL30-WiFi also uses two internal AAA batteries as a backup should external
power be unavailable, for example in the event of a power cut. If used as a backup, the
batteries have a life span of approximately 6 to 12 months, depending on the time the
unit operates without external USB power.
Running the UTREL30-WiFi solely without an external supply is possible, but not
recommended, as it will deplete the AAA batteries in around 2 to 3 months and also
shorten the life of the secondary backup battery.
The rate at which battery power is used largely depends on the signal strength of the
wireless network signal, with a weaker signal draining the battery faster. A short log
interval, viewing data on the display frequently and sounding the alarm often will also
reduce battery life.
The batteries inside the unit will not be charged when external power is
supplied.
A 4-bar battery indicator shows an approximate remaining battery capacity. If the
batteries are full, this symbol will be shown:
When the batteries are empty, this symbol will be shown, and the batteries require
replacement.
