Thermo King 098916, Maintenance Manual

Page: 62 / 196

Operating Instructions
61
each sensor and activate data logging. However,
the USDA Type screen in the Configuration menu
must be set to the correct sensor setting and each
USDA sensor must be calibrated to comply with
USDA temperature recording requirements.
Calibrate the sensors in an ice bath. MAGNUM
units equipped for NTC style USDA sensors
require USDA sensor P/N (refer to Tool Catalog).
MAGNUM units equipped for PT100 style USDA
sensors require USDA sensor P/N (refer to Tool
Catalog).
Ice Bath Preparation
1. The ice bath should consists of an insulated
container full of ice made from distilled water
with enough distilled water added to cover the
top of the ice during the test. A properly filled
ice bath should be completely filled with ice
all the way to the bottom of the container.
2. Stir the ice bath briskly for one minute before
proceeding.
3. Insert the USDA sensors in the ice bath. Wait
5 minutes to allow the sensor temperatures to
stabilize at 0 C (32 F).
4. Stir the ice bath frequently. As an option, test
and verify ice bath temperature with a meter
or measuring device meeting your accuracy
requirements. Stirring 10 seconds every 3
minutes during the test procedure is adequate.
Calibrating the USDA Sensors
1. Insert all USDA sensors in an ice bath (see
“Ice Bath Preparation” above).
NOTE: The sensors must be completely
immersed in the ice bath without contacting
the walls of ice bath container for 5 minutes.
2. Press the F2 or F3 key to enter Main menu.
3. Press the
F2
or
F3
key to scroll through menu
list until [DATALOGGER] appears in LCD
display.
Figure 35: Datalogger Menu
4. Press the
F4
key to access the Datalogger
menu. [INSPECT TEMP LOG] appears in
LCD display.
5. Press the
F2
or
F3
key to scroll through
submenu until [CALIBRATE USDA PROBE]
appears in LCD display.
6. Press the F4 key to enter Calibrate function.
The display shows [ACTUAL] and [NEW
CORR] temperature off-sets for each sensor in
two rows.
The controller displays [COOR] in place of a
temperature offset until the sensor comes within
0.3 C (0.5 F) above or below 0 C (32 F).
ALARMS
DATA
RMM STATE
Datalogger Menu
- Inspect Temp Log
- PTI State
- Inspect PTI Log
- Calibrate USDA Probe
- Activate Trip Start
- Set Log Time
- Inspect Event Log
MAIN MENU
DATALOGGER
CONFIGURATION
MISC. FUNCTIONS
COMMANDS
NOTE: All screens are NOT
present on all units. The
screens that display on the
controller are determined by
the Controller Software
settings and the options
installed on the unit.