Bird Technologies ACMI - Manual (Page 5)

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Caution Statements
The following equipment cautions appear in the text and are repeated here for
emphasis.
CAUTION
The input voltage must be clean and stable. Be sure that the input voltage
does not surge and does not contain spikes. Failure to comply may result in
permanent damage to the instrument.
See page 8.
CAUTION
The maximum input voltage differential is 72 V for High Voltage models, 36
V for Medium Voltage models, and 18 V for Low Voltage Models. Do not
apply an input voltage differential greater than the voltage limit for the
model. Failure to comply may result in permanent damage to the
instrument.
See page 8.
CAUTION
Do not use harsh or abrasive detergents for cleaning.
See page 21.