EASY
SENSE Vu+ Reference Manual DO255 (3)
24
Data Harvest Group Ltd.
Batteries
Vu+ is fitted with a rechargeable lithium-ion battery pack. Whenever Vu+ is connected to the USB port
on the computer, it will automatically re-charge the battery.
Lithium-
ion batteries are ‘memory-free’ and prefer a partial rather than a full discharge. Constant
partial discharges with frequent recharges will not cause any harm. Frequent full discharges should be
avoided whenever possible.
Ideally Vu+ should be stored at about 40% or more charge. Do not
store Vu+ with its battery fully
discharged or with sensors connected. Even when turned off (asleep), Vu+ will use a small amount of
current, and the battery will slowly discharge (some reserve charge is required to retain data and
settings in memory). If Vu+
is to be stored for lengthy periods without use
then it’s a good idea to
recharge the battery every 6
– 8 weeks.
When its battery is in good condition and fully charged it will power Vu+ in EasyLog or remote mode
for a minimum of 41 days.
The speed at which a lithium-ion battery will age is governed by both its storage temperature
(preferably less than 40ºC) and state-of-charge. Ideally batteries should be replaced every 4 years.
Eventually the battery pack will no longer deliver the stored energy and will need to be replaced. A fully
charged battery that loses its charge quickly or a battery with symptoms of swelling or physical
damage will demonstrate the need for replacement. When this happens, contact Data Harvest and
request a battery replacement pack for
EASY
SENSE Vu+
– Product No. 5007.
Auto switch off
While battery powered Vu+ will normally auto switch off (go into low power sleep mode) to reduce
power consumption if more than two minutes have passed since any measurements have been taken
or a button was pressed.
If Vu+ is accepting power from the USB port or similar it will not operate auto switch off.
Vu+ will wake up when any button is pressed.
While remote recording on battery power in EasyLog mode or after using Setup Remote, Vu+ will
stay awake until the interval between readings reaches 5 seconds or greater
– at this point it will
begin to use sleep mode between samples (waking up just in front of the sample time to allow the
sensors to stabilise).
While in Timing or Counting mode Vu+ does not operate auto switch off and will stay awake
ready to take a measurement.
Internal Clock and Calender
Vu+
’s internal clock will be updated automatically by the computers clock (date and time) each time it
is connected to the computer and the EasySense software is run.
Note:
If the date or time on a data set is not correct, check the date/time settings on your computer.
Vu+
’s memory
Multiple sets of data can be stored in Vu+’s memory. The actual number will depend on the size of the
data sets and that is dependent on how many sensors are connected and how many readings are
taken.
Notes:
A System, Full Reset will
erase
all data sets and return the logger back to its factory default settings. See
Individual data sets or all can be deleted via System, Delete Data.
