Labconco FreeZone 76700 Series, User Manual

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Product Service 1-800-522-7658 38
C
HAPTER
8
M
ODIFYING
Y
OUR
F
REEZE
D
RYER
D
ISPLAY
Your Freeze Dryer has been carefully calibrated and tested before shipping,
however under certain circumstances it may be necessary to adjust the calibration
of the temperature and/or vacuum display or to modify alarm points. Adjustments
may be necessary if the Freeze Dryer requires service or if it is operating on a line
voltage outside the voltage range at which the alarm was preset. This DOES NOT
mean that the Freeze Dryer may be operated at a voltage outside the ranges shown
in Appendix C.
Temperature and Vacuum Display
An offset may be added to the collector temperature or vacuum display. Use an
accurate traceable known reference to compare the readings.
Temperature offset may be varied ±5°C in 1°C increments. Vacuum offset may be
varied ±0.020 mBar in 0.001 mBar increments.
Line Voltage Alarm Points
The Freeze Dryer is designed to alarm if the line voltage varies more than ±10%
from nominal line voltage. Models rated to operate on 115V are preset to alarm if
the voltage drops below approximately 103V or rises above approximately 127V.
Models rated to operate on 230V will alarm if the voltage drops below
approximately 206V or rises above approximately 254V. Some models are
designed to operate below these ranges (see Appendix C). In these cases it is
permissible to lower the low voltage alarm point to prevent nuisance alarms from
occurring.
Low line limit may be lowered in 5 increments of approximately 2 to 3V
increments for 115V models or disabled.
Low line limit may be lowered in 5 increments of approximately 4 to 5V
increments for 230V models or disabled.