CHART MVE 1839 - Liquid Nitrogen Saturation Temperature

MVE Biological Systems
TEC 3000 Operating and Maintenance Freezer Manual
13289499 Rev H • 51
7.2.1.4. Liquid Nitrogen Saturation Temperature
This section shows how to adjust the LN2 saturation temperature. This temperature is
altitude dependent. The default LN2 saturation temperature is -195.8°C (-320.4°F, 77.4
K). This value is accurate for altitudes ranging form sea level to 500 feet (152 m). For the
appropriate saturation temperature, refer to Table 5: LN2 Saturation Temperatures.
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 “LN2 Temperature”.
Use the “▲/▼” keys to adjust setting per Table 5 and
press “ENTER” to save the change.
Table 5: LN2 Saturation Temp vs. Altitude
Altitude
LN2 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
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
LN2 Temperature
Use ▲▼ to adjust
Press ENTER to save
-195.8 °C