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TW-357 REV E
28
The MENU PASSWORD can be set through the menu system of the control (MENU, 5, 2). The menu
password requires entry of a 4-digit password before allowing access to the menu system to change any
control settings. Follow the directions on the display to set a new password or to disable a password.
Codes 0000 & 9999 are invalid choices. A code of 9999 is used to access a procedure to clear passwords
should they be forgotten.
User Options
The user options menu choice covers all other control settings not already covered. These include serial port
settings, date and time settings, Lid Settings, Defog, Quick-Chill, Temperature Control, Valve Freeze-Guard,
Display brightness and Control Information.
Lid Switch Setup
LID SWITCH SETUP can be accessed through the menu system of the control (MENU 6, 2, 2, 2). This
option enables or disables the lid switch.
Manual Defog
DEFOG TIMER can be changed through the menu system of the control (MENU, 6, 2, 2, 1). This is the time
interval that the valve is opened when the user manually presses the defog button. The possible choices are
disabled through 90 seconds.
Auto Defog
The AUTO DEFOG (MENU, 6, 2, 2, 3) feature provides a burst of gaseous N2 to the freezer to clear the fog
when the lid is opened. This is activated through the lid switch. If the lid switch is deactivated this feature will
be disabled. The choices for auto defog time are disabled through 90 seconds.
Quick-Chill
The QUICK-CHILL (MENU, 6, 2, 2, 4) feature provides a burst of N2 gas to the freezer to lower the
temperature each time the lid has been opened and then closed. This is activated through the lid switch. If the
lid switch is deactivated this feature will be disabled. The choices for quick-chill time are disabled through 90-
second purge of gaseous nitrogen.
Control By Temperature
CONTROL BY TEMP can be set through the menu system of the control (MENU, 6, 2, 3). By enabling this
option KRYOS will control by temperature around Thermocouple #1. The Temperature Control menu choices
are only available if Thermocouple #1 is enabled.
Temperature Control Settings
TEMP CTRL SETTINGS can be set through the menu system of the control (MENU, 6, 2, 3, 2, 1). The user
can set the temperature that must be maintained in the freezer around Thermocouple #1. The set-point can be
set from -180º to -100ºC.
Control Temperature
KRYOS can also provide a vapor chamber temperature control for specimens that must be stored in a
particular vapor temperature range. The temperature control function operates in addition to the level control
function. The level control always takes precedence. If the liquid level of LN2 is maintained between the
START FILL sensor and the STOP FILL sensor, the control attempts to maintain a selected temperature
around Thermocouple #1.