Cold Treatment (CT)

This feature is designed to maintain a temperature below the actual setpoint for a period of time (per USDA specifications), and then increase the temperature to the final setpoint. If at any time one of the USDA sensor temperature reading goes above the USDA Max the CT period will begin again.

To document the CT, a set of events and temperatures are recorded in the datalogger. When the CT has passed the controlling setpoint will be increased at slow rate to the final setpoint.

Controller Settings

• CT Temperature Setpoint - Setpoint temperature used during the CT period.

• CT Period - Number of days and/or hours accepted by the USDA max limit, to pass the CT period.

• CT MAX USDA Temperature - Maximum allowed USDA sensor temperature during the CT period.

• CT Final Temperature Setpoint - Final setpoint temperature after the CT passes.

• CT Heatup - Delay interval between each 0.1 C increase (normally 1 hour).

Trip Action and Unit Mode

• Container is prepared with CT settings and transported to be loaded. If the unit is running the container will pre-cooled.

• If unit is equipped with the UDSA sensors, once all the sensor temperature readings deceases to or below the USDA Max the CT period will start.

• Cargo is loaded and USDA sensors are placed in the cargo per the USDA specification.

• USDA sensor readings will increase to cargo temperature and a running CT period will be canceled. Pull down of the cargo temperature begins.

• Once all the USDA sensor temperature readings decease to or below the USDA Max the real CT period will start.

• If any of the USDA sensor temperature readings go above the USDA Max, the CT period will be canceled and the above action will repeat.

• When the specified number of days has finished the controlling setpoint is increase, 0.1 C per hour, until the final setpoint is reached.

During the CT a set of events and temperature readings are logged in the datalogger.

Unit Requirements

To activate CT the unit must have:

• 1 - 3 UDSA or Cargo sensors

• Battery (Battery is required for off power logging)

Activating Cold Treatment

Go to the Configuration > Options Menu enter CT Feature and turn it ON.

Calibrate Probe (Optional)

Setting the USDA Type in the Configuration menu activates spare sensors 1, 2, 3, and 4 for USDA Cold Treatment Temperature Recording. USDA sensor temperatures are recorded in the datalogger memory.

The USDA sensors should be connected to the controller and located in the load as shown in USDA directives. When a USDA sensor is installed, the controller will automatically detect 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. Units equipped for NTC style USDA sensors require USDA sensor P/N (refer to Tool Catalog). 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 five 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 three 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 five minutes.

2. Press the Enter key. Press the DOWN key to scroll down to the CONFIG Menu.

3. Press the Enter key to access the CONFIG menu.

4. Press the UP/DOWN key to scroll down to the Calibration Menu.

5. Press the Enter key to access the Calibration Menu.

6. Press the Down key to scroll down to CALIBRATE PROBES.

7. Press the Enter key to enter Calibrate function. The display shows [RAW] and [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).

   The controller displays the actual temperature offset when the sensor temperature is within 0.3 C (0.5 F) above or below 0 C (32 F).

   Note The sensors should be in the ice bath a total of 15 minutes or more to assure the sensor temperature has bottomed out.

8. Press the Down key to release the current actual temperature offsets from the controller memory. Observe the sensor temperatures in the [CORR] row.

9. Press the Enter key to accept the new temperature offsets when all sensor offsets read between + 0.3 C (+0.5 F) and - 0.3 C (-0.5) and have been stable for five minutes. The controller display will show the new offsets in the [RESULT] row.

10. Press the Esc key to exit the Calibrate menu.

Starting Cold Treatment

1. Go to the Setpoint/Control and enter Cold Treatment (CT).

2. Display will show the Cold Treatment setting list, scroll up and down to edit and enter the settings per the load specifications.

   Note Once Cold Treatment has been started, it must be stopped to change any of the settings.

3. Select EXIT. The Standard Display will appear showing “CT In Progress”. CT is activated and the trip begins.

Stopping Cold Treatment

1. Press the CT Key.

2. Scroll down to ABORT CT - PRESS >STOP< and press STOP.

3. The Standard Display will appear and “CT In Progress” will disappear from the display.

Passed Cold Treatment - must be acknowledged: To verify the user observes the passed display, Acknowledge CT will be displayed until it is acknowledged by pressing the CT Key and them pressing the ACK Key.

Surveillance during cold treatment: During the CT period all USDA sensors can fail and the CT period will continue. The fail state will be shown in the temperature log. If all three probes fail, the period will continue based on time only.

RMM / Refcon: The RMM at no time during the CT is able to change any of the CT settings The RMM interface will show the final temperature as setpoint through out the trip, even when the period is running and another setpoint is used.

Economy mode: Running economy mode either manually or automatically by the AVL, will automatically be set to OFF during CT pull down and period. After the CT period ends the economy mode is reinstated (starting from warm up phase).

Associated tools: LogView must be updated to Version 5.8.2.0 to report the cold treatment events.

Various actions: When the user activates the cold treatment, a trips start mark and event is automatically made.