Powering the UTRED30-WiFi
The UTRED30-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 UTRED30-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 UTRED30-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 approx. 6 to 12 months, depending on the time the unit operates without external USB power.
Running the UTRED30-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.
This is largely influenced by 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.
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.
