Carrier 69NT40-561-300, Operation And Service Manual

Page: 57 / 174

4–23 T-365
a. USDA Recording
A special type of recording is used for USDA cold treatment purposes. Cold treatment recording requires
three remote temperature probes be placed at prescribed locations in the cargo. Provision is made to con-
nect these probes to the DataCORDER via receptacles located at the rear left-hand side of the unit. Four or
five receptacles are provided. The four 3-pin receptacles are for the probes. The 5-pin receptacle is the rear
connection for the Interrogator. The probe receptacles are sized to accept plugs with tricam coupling locking
devices. A label on the back panel of the unit shows which receptacle is used for each probe.
The standard DataCORDER report displays the supply and return air temperatures. The cold treatment
report displays USDA #1, #2, #3 and the supply and return air temperatures. Cold treatment recording is
backed up by a battery so recording can continue if AC power is lost.
b. USDA/ Message Trip Comment
A special feature in DataLINE allows the user to enter a USDA (or other) message in the header of a data
report. The maximum message length is 78 characters. Only one message will be recorded per day.
4.8.12 USDA Cold Treatment Procedure
The following is a summary of the steps required to initiate a USDA Cold Treatment:
a. Calibrate the three USDA probes by ice bathing the probes and performing the calibration function with the
DataLINE. This calibration procedure determines the probe offsets and stores them in the controller for use
in generating the cold treatment report. Refer to the Data Retrieval manual 62-10629 for more details.
b. Pre-cool the container to the treatment temperature or below.
c. Install the DataCORDER module battery pack (if not already installed).
d. Place the three probes. The probes are placed into the pulp of the product (at the locations defined in the fol-
lowing table) as the product is loaded.
e. To initiate USDA recording, connect the personal computer and perform the configuration as follows, using
the DataLINE software:
1. Enter ISO header information.
2. Enter a trip comment if desired.
3. Configure the DataCORDER for five probes (s, r, P1, P2, P3) (dcf02=5).
4. Configure the logging interval for one hour.
5. Set the sensor configuration to “USDA.”
6. Configure for two byte memory storage format (dcf04=LONG).
7. Perform a “trip start.”
4.8.13 DataCORDER Alarms
The alarm display is an independent DataCORDER function. If an operating parameter is outside of the expected
range or a component does not return the correct values to the DataCORDER, an alarm is generated. The Data-
CORDER contains a buffer of up to eight alarms. A listing of the DataCORDER alarms is provided in
Table 4–7 .
Refer to Section 4.8.7 for configuration information.
Sensor 1 Place in pulp of the product located next to the return air intake.
Sensor 2 Place in pulp of the product five feet from the end of the load for 40 foot containers,
or three feet from the end of the load for 20 foot containers. This probe should be
placed in a center carton at one-half the height of the load.
Sensor 3 Place in pulp of product five feet from the end of the load for 40 foot containers or
three feet from the end of the load for 20 foot containers. This probe should be placed
in a carton at a side wall at one-half the height of the load.