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SECTION
14.
INSTALLATION AND MAINTENANCE
14.2
POWER REQUIREMENTS
The 21X operates at
a nominal12V
DC.
Below
9.6 or
above
16
volts the 21X
does not operate
properly.
The
21X
is
diode protected against accidental
reversal of
the positive and ground leads
f
rom'
the
battery.
Input
voltages in excess of
18V
may damage the 21X and/or power
supply. A
transzorb provides transient protection by
limiting voltage at approximately 20V.
System operating time for
the batteries can
be
determined by dividing the battery
capacity
(amp-hours)
by
the average system current
drain.
The 21X
draws 1.0 mA
in
the quiescent
state,
25 mA while processing, and 60 mA
during an
analog measurement;the length
of
operating time for each
datalogger instruction
is
listed in Section
3.
Typicalcurrent
for common
21X peripherals are given
in
Table
14.2-1
:
14-2
FIGURE
14.3-1.
21X
Battery Pack and
Panel
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