3-11
T-296
allows interrogation, configuration variable assignment,
screen view of the data, hard copy report generation,
cold treatment probe calibration and file management.
Refer to Data Retrieval manual 62-10629 for a more
detailed explanation of the DataLINE interrogation
software. The DataLine manual may be found on the net
at www.contaner.carrier.com
c. Communications Interface Module
The communications interface module is a slave
module which allows communication with a master
central monitoring station. The module will respond to
communication and return information over the main
power line.
With a remote monitoring unit installed, all functions and
selectable features that are accessible at the unit may
be performed at the master station. Retrieval of all
DataCORDER reports may also be performed. Refer to
the master system technical manual for further
information.
3.6.11 USDA Cold Treatment
Sustained cold temperature has been employed as an
effective postharvest method for the control of
Mediterranean and certain other tropical fruit flies.
Exposing infested fruit to temperatures of 2.2 degrees
Celsius (36
_
F) or below for specific periods results in
the mortality of the various stages of this group of
insects.
In response to the demand to replace fumigation with
this environmentally sound process, Carrier has
integrated
Cold
Treatment
capability
into its
microprocessor system. These units have the ability to
maintain supply air temperature within one-quarter
degree Celsius of setpoint and record minute changes
in product temperature within the DataCORDER
memory, thus meeting USDA criteria. Information on
USDA is provided in the following subparagraphs
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
connect 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 three-pin
receptacles are for the probes and fifth, five pin,
receptacle is the rear connection for the 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 is incorporated which allows the user
to enter a USDA (or other) message at the head of a
data report. The maximum message length is 78
characters. Only one message will be recorded per day.
3.6.12 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 DataReader or a personal computer. This calibra-
tion 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 fruit (at the locations defined in the fol-
lowing table) as the product is loaded.
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 con-
tainers, 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.
e. To initiate USDA Recording, connect the personal
computer and perform the configuration as follows:
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