38 | Operation
Thermo Fisher Scientific CryoExtra CE8100 Series
4.
Press “ENTER”
The display will read “Password
Entry Mode”.
5.
Press “SETUP”
Until the display reads “Change
Password 1”. Continue to press
“SETUP” to access passwords
2-9.
6.
Press “ENTER”
The display will read “Password 1”.
Use the “
” keys to input
Password 1 and press “ENTER” to
advance the cursor.
7.
Press “ENTER”
The display will read “Password 1
Level” Use the “
” keys to
select the appropriate Security
Level.
8.
Press “ENTER”
The display will read “Confirm new
Password?” Use the “
”
keys to change “NO” to “YES” and
press “ENTER” to save.
Calibration Procedures
Temperature Sensor
Calibration
This section describes how to calibrate the Controller
temperature sensors. There are two calibration procedures:
single point and two point calibration. For single point
calibration, the reference point is LN
2
. For two point
calibration, the reference points are LN
2
and ice water. Unless
regulations require a two point calibration, the single point
calibration procedure is recommended. The benefit of two
point calibration is more accurate temperature measurement
in near room temperature environments. The drawback is a
longer, more complex calibration procedure. The benefit of a
single point calibration is a simple calibration procedure. The
drawback of single point calibration is less accurate
temperature measurement in near room temperature
environments.
All new freezers equipped with controller have been calibrated
at the factory. The temperature sensors should only be
calibrated if faulty readings are suspected; a sensor or the
Controller itself has been replaced, following a firmware
update or as a part of a preventative maintenance schedule.
For an accurate calibration, the LN
2
Saturation Temperature
(Section
“Liquid Nitrogen Saturation Temperature”
)
needs to be correctly set based on the altitude of the freezer
location.
Note:
Security Level 2 or higher is required to calibrate
temperature sensors.
Single Point Calibration
The single point calibration procedure requires a small volume
of LN
2
; enough to completely submerge the end of the
temperature sensor. It may be possible to use the LN
2
in the
freezer space if the probe length permits.
1.
Press “SETUP”
Controller will prompt for a
password. 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”.
Press “SETUP” for Temp B.
4.
Press “ENTER”
The display will read “Temp A”.
5.
Press “SETUP”
Until the display reads “Temp A
Calibration”.
Password Entry Mode
ENABLED
Use
to adjust
Press ENTER to save
Press ENTER to Change
Password 1
or press SETUP for next
Password 1
Use
to
adjust
Press ENTER for next
XXXX
Password 1
Use
to
adjust
Press ENTER for next
Level 1
Confirm new Password?
No Use
to adjust
Press ENTER to save
CAUTION :
Always wear protective gloves and
face shield when handling LN
2
. Refer to the
section of this manual.
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
Temp A ENABLED Use
to adjust
Press ENTER to save
Press ENTER to
Temp A Calibration or
press SETUP for next
menu
