31
decreased. Averaging functions in particular will increase battery
consumption considerably. Temperature fluctuations affect battery voltage
and hence the remaining battery life. The battery life estimate assumes
that the working temperature will be between -20°C and +65°C. At -30°C,
the battery life can be decreased to 10% of normal. For extended
operation at temperatures below -10°C, Eltek recommends Energizer®
lithium (non-rechargeable) batteries. The battery life estimate also takes
into account the sensor switch on time, and assumes that the sensor
draws 10 mA.
The memory that stores the data and datalogger settings is protected by a
Lithium coin cell (see 12.5). If
“Li” is displayed in the top right hand corner
of the display, then the Lithium coin cell must be replaced.
S T A T b a t t e r y L i
8 . 7 V 6 5 d a y s
4.10.2 External power supply
S T A T e x t s u p p l y
8 . 9 V
The logger can be used with an Eltek external DC power supply type
MP12U (if GSM modem use anticipated) or MP12U5W (in all other
situations). These are ultra-low leakage and wired correctly with a 2.1mm
power jack. An external supply should always be used for situations which
involve long-term deployment, averaging, high current demand sensors
and when using the logger in METER mode for prolonged periods. If the
external supply fails, the internal batteries provide backup to keep the
memory secure or to continue logging.
4.10.3 Memory size selection
S T A T m e m s i z e
2 4 9 K
Memory size may be changed within this function. The default memory
size is 250,000 readings but options are available to increase total
memory size to 500,000, 1,000,000 or 2,000,000 readings. This is
particularly useful if you know how much information you need over a
particular time period and wish to avoid excessive data retrieval and
downloading. If you wish to change the memory size, press and hold
set
.
