7-3SectionMaintenance of the NT21
184
7-3-1 Installing or Replacing the Battery
An
optional lithium battery can be installed
in the NT21 to backup the memory
contents,
data saved by the resume function,
display history data, alarm history
record data, and recipe data. (The battery is
an
optional accessory
, so a battery
is not installed when the NT21 is shipped from the factory.)
The
battery life is about 5 years if the
NT21 is used in a location where the ambi
-
ent
temperature is 25
_
C. If the temperature at the location of use is higher than
this,
the
battery life will be shorter
. Change the battery at suitable intervals in ac
-
cordance with the operating environment of the NT21.
It is advisable to keep a spare battery so that the battery can be replaced im-
mediately when replacement becomes necessary.
If a battery is installed, turn ON the Battery Low Check memory switch.
Battery Model
3G2A9-BAT08
Use the following procedure to install the battery.
1, 2, 3... 1. Insert
a flat blade screwdriver at
the top of the battery cover located at the
right of the rear face of the NT21 and pull it toward you.
2. Mount
the battery in the clips on
the back of the battery cover and insert the
battery’s connector into the NT21’s connector. When inserting the battery
connector,
check
that the connector tab is facing right and insert the battery
connector fully so that there is no space between the two connectors.
3. Arrange
the battery wires so that they will not be pinched by the battery cov
-
er and close the battery cover.
Replacing the Battery
When to Replace the Battery
Replace
the battery in the
following cases. The battery must be replaced within 5
days.
• When 5 years have passed since the installation of a new battery.
• When the RUN Indicator is lit in orange (during operation) or in red (when
stopped).
Installing the Battery
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