Thermo Scientific CryoExtra 20 CE8120, Руководство по эксплуатации и техническому обслуживанию

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26 | Operation Thermo Fisher Scientific CryoExtra CE8100 Series
8. Press “SETUP”
The display will read “Temp A
Low Alarm”. Use the “
”
keys to adjust setting and press
“ENTER” to save the change.
Liquid Nitrogen
Saturation Temperature
This section shows how to adjust the LN
2
saturation
temperature. This temperature is altitude dependent. The
default LN
2
saturation temperature is -195.8°C (-320.4°F,
77.4 K). This value is accurate for altitudes ranging from sea
level to 500 feet (152 m). For the appropriate saturation
temperature, refer to table
“LN2 Saturation Temp vs.
Altitude”
.
1. Press “SETUP”
Controller will prompt for a
password. A flashing cursor on
the entry screen will make it clear
which digit is being changed. Use
the “
” keys to scroll to the
appropriate number. Press
“ENTER” to advance the cursor to the next position.
2. Press “ENTER”
The display will read “Temperature
Menus”.
3. Press “ENTER”
The display will read “Temp A
Menu”.
4. Press “SETUP”
Until the display reads “LN
2
Temperature”. Use the “ ”
keys to adjust setting per Table 5
and press “ENTER” to save the
change.
Liquid Level Settings
This section demonstrates how to adjust the LN
2
level
settings.
Level Setpoints and Alarms
The auto fill settings can be adjusted in the Liquid Level
Menus. With auto fill enabled, the Controller will initiate an
auto fill when the level is at or below the Low Level Setpoint
and terminate a fill when the level reaches the High Level
Setpoint. If the level is at or below the Low Level Alarm or at or
above the High Level Alarm, the Controller will initiate that
respective alarm.
Note:
There must be a minimum of 0.5 inches between each
of setpoint and alarm. For example, if the Low Level Alarm is
set to be 4.0 inches, then the Low Level Setpoint would have
to be set at least 4.5 inches. The Low Level Alarm can be set
to a minimum value of 3.0 inches and the High Level Alarm
can be set to a maximum value of 48.0 inches.
Note:
Security Level 2 or higher is required to adjust the
Liquid Level Settings.
Temp A Low Alarm
ENABLED
Use to
adjust
Press ENTER to save
Higher User Level
Required use
to
ENTER Password 0000
Press ENTER for
Temperature Menus or
press SETUP for next
menu
Press ENTER for
Temp A Menu or press
SETUP for next menu
LN
2
Temperature
Use to adjust
Press ENTER to save
-195.8
°
C
Table 5. LN
2
Saturation Temp vs. Altitude
Altitude
LN
2
Saturation
Temperature
Feet Meters °C °F K
Sea Level –
500 Sea Level –
152
-195.8 -320.4 77.4
501 -1000 152 -305 -196.0 -320.7 77.2
1000 – 1500 305 – 457 -196.2 -321.1 77.0
1501 – 2000 457 – 610 -196.4 -321.5 76.8
2001 – 3000 610 – 915 -196.6 -321.9 76.6
3001 – 4000 915 – 1220 -196.9 -322.4 76.3
4001 – 5000 1220 – 1524 -197.2 -322.9 76.0
5001 – 6000 1524 – 1829 -197.5 -323.5 75.7
6001 – 7000 1829 – 2134 -197.8 -324.0 75.4
7001 – 8000 2134 – 2439 -198.1 -324.6 75.1
8001 – 9000 2439 – 2744 -198.4 -325.1 74.8
9001 – 10000 2744 – 3049 -198.7 -325.7 74.4