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condensation can occur if it is brought into a warmer environment. The
datalogger should be placed in a sealed container (a plastic bag provides
a cost-effective solution). The container should remain sealed until the
datalogger has warmed up to room temperature.
12.5 Protection against memory loss
The memory, which stores the data and datalogger settings, is protected
by a Lithium coin cell (3V Panasonic BR2032). This battery is only used if
the voltage of the main batteries is below the operating threshold. If there
are no main batteries connected, the Lithium coin cell will protect the
stored data for approximately 2 years.
The condition of the Lithium coin cell may be checked in the STAT battery
function (see 4.10.1). If
‘Li’ is displayed in the top right hand corner of the
display, then the Lithium coin cell must be replaced.
12.6 Changing batteries
USE ONLY NON-RECHARGEABLE LR6 (AA) ALKALINE BATTERIES.
Using other types can damage the logger and external power source and
can cause battery leakage, leading to corrosion and subsequent logger
failure.
It is important that one of the following procedures is used to change the
batteries, otherwise memory and logger settings may be lost: -
Stop logging, remove the batteries and wait at least 2 minutes before
fitting new batteries as a complete new set of the same type. Alternatively,
connect an external power supply for uninterrupted logging, and then
change the batteries.
It is good practice to ensure that the logger is not left for long periods
without the main batteries as this will drain the Lithium coin cell, which will
need to be replaced.
12.7 Resetting the datalogger
The 1000 Series Squirrel datalogger has a
‘watchdog’ facility that
automatically resets the datalogger in the unlikely event of a system
failure. If failure occurs, the watchdog will reset the datalogger and stop
logging (if logging is in progress). Stored data can then be downloaded.
Should the datalogger ever hang up completely, it must be reset manually
by pressing the reset button. This black reset button is located to the left
of and below the opened battery compartment and is accessible through
the aperture where the catch of the battery lid engages; it should be
depressed using a blunt insulated probe. If this fails, remove all power to it
and leave it for 10 minutes before reconnecting, and then press the reset
