Universal User Guide, Rev L, February 2022
50
9.3.3
Card Type
The MAT-1 logger is theoretically compatible with all microSDHC cards of up to 32GB that have the
FAT32 file system. But the logger has only been tested with a very small subset of the hundreds of
brands and models of microSD cards. Testing at Lowell Instruments has shown that while a card may
technically be functional, all cards are not equal. Even d
ifferent model cards from the same “name
brand” manufac
turer may perform significantly differently. Of particular concern is that some cards
have slow write speeds and use more energy (battery) than other cards.
Lowell Instruments purchases microSD cards from a reputable supplier and tests supplied makes and
models to ensure that it is compatible with the MAT-1 logger. Contact Lowell Instruments if you would
like to get an up-to-date list of recommended replacement microSD cards.
9.4
Battery Information
The MAT-1 logger contains a lithium thionyl
chloride non-
rechargeable “A” (NOT “AA”) size
battery. Lithium thionyl chloride batteries have
very high energy density and are used in several
common devices such as natural gas meters and
automatic toll transponders. Lithium thionyl
batteries perform well in a wide range of
temperatures and have a much lower self-
discharge rate of about 1-2% per year compared
to lithium-ion batteries, which typically lose 10%
or more per month.
The MAT-1 logger draws power from the USB port when it is connected but does not recharge the
battery. If the battery has failed, the logger will operate when connected to a USB port and data can be
offloaded and sensor values checked. But the status screen will indicate that the battery has been
discharged and should be replaced.
for Material Safety Data Sheets and other regulatory
information.
Warning
: This logger contains a lithium battery. Do not
cut open, incinerate, heat above 85°C (185°F), or
recharge the lithium battery. The battery may explode if
the logger is exposed to extreme heat or conditions that
could damage or destroy the battery case. Do not
dispose of loggers or batteries in fire. Do not expose the
contents of the batteries to water. Dispose of the
batteries according to local regulations for lithium
batteries.
