USER MANUAL
TYPE ML-2012/13
Manufacturers of low power instruments
page 33
4.15 Power supply
The ML-2012/13 PCB is designed to work with a power supply of minimum 0.8 to maximum 5V DC
The ML-2012 can be powered with a D-size 3.7V Lithium cell or external supply of max 5V DC.
The ML-2013 is provided with a cover containing a D-size battery holder for a 3.7V Lithium cell. The ML-
2013 can optional be provided with a cover with integrated NiMH AA solar charger, 8..30V DC-adapter or
85..265V AC-adapter.
4.15.1 Internal RTC backup battery
The ML-2012/13 contains an internal battery to keep the internal real-time-clock running. The lifetime of
the battery is at least 10-20 years, so this battery requires no exchange during the lifetime of the data
logger The battery is a coin cell and is soldered to the printed circuit board.
4.15.2 Power consumption & Battery Life
Average current consumption @3.6V
Subject
Value
Remarks
Data logger in low power sleep
<100uA Preferred mode of operation.
Data logger in MODEM sleep
2mA
MODEM is stand-by and can be accessed by dialing-
in. THIS IS A NONE LOW POWER MODE.
Data logger is awake
65mA
The logger is awake to be able to take and log a
measurement.
Data logger is transferring GPRS
data
220mA
Requires a good GPRS signal.
The ML-2012/13 is equipped with an internal power monitor. During the active mode of the data logger,
this power monitor keeps track of the power consumption of the device. When the device is going into
sleep-mode, a fixed value is used to calculate the power consumption. Both are calculated and offer a
fairly accurate measurement of the power consumption. Unfortunately, the behaviors of batteries are, in
practice, much more complicated than the calculation made inside the data logger. So, the capacity,
written on the back of the battery is only a typical value. Things like: Shelf life, ambient temperature,
current draw, and peak current draw, affect the performance of the battery.
Therefore, we strongly advise to use the measurements regarding battery life as an indication only. We
also recommend to replace the battery, fairly above 0%. If you want the best performance and the most
optimized settings for your particular measurement location, contact the supplier of the Battery
(
www.saftbatteries.com
). They can provide you more specific details and advise on your application. You
can provide them information by sending them a bit of previously measured data, for analysis. When you
have received the advice, you probably decrease the value of “Battery Capacity” in the configuration
setup, to a bit lower value than the default (17 Ah)
When using the cover with integrated NiMH AA solar charger, we recommend to use LSD (long self
discharge) NiMH AA rechargeables with at least a capacity of 2000mAh (e.g. GP Receyko, Sony Eneloop
or Vapex Instant)
Please consult the
www.your-data-our-care.com
website for an online power consumption calculator.
