APL: Reefer - Maintaining Precise Temperatures

Refrigerated Cargo
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	Precise Temperatures
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Maintaining Precise Temperatures

On APL reefer containers, computers precisely control temperatures throughout transit. The microprocessor-based control units, designed by our suppliers with input from APL, are the most advanced in the industry and allow for accuracy within +/- 0.4 °F (+/- 0.25°C) of the temperature's set point for chilled commodities. For frozen commodities, the advanced refrigeration systems can maintain subzero °F in all environments encountered in international trade.

Self-diagnostic units with the latest microprocessor controller are designed to record transit temperatures and equipment performance every hour, and retain historic data in memory for a minimum of one year. The reefer microprocessor data recorder will also monitor all the four temperature sensors that include two supply-air and two return-air sensors, as well as any changes or events that might occur during transit. The electronic data recorder will continue to record temperature readings using a backup battery even when reefers are unplugged in the event of port transshipment.

Bill of lading: 123456789	Temperature unit: Fahrenheit
Origin: DVO	Date: Jan 24, 2003
Destination: SIN	Set point: 54.50
Origin Date: 01/20/2003	Container: APRU5015930
Discharge Date: 01/31/2003	Serial: 04173512

Time	SupAir	RetAir	PrRtTm	PrSuTm	Time	SupAir	RetAir	PrRtTm	PrSuTm
01:00	54.50	55.40	55.71	54.50	13:00	54.50	55.85	55.83	54.50
02:00	54.50	55.85	55.81	54.52	14:00	54.50	55.85	55.81	54.48
03:00	54.50	55.85	55.96	54.50	15:00	54.50	55.85	55.80	54.52
04:00	54.50	55.85	56.08	54.52	16:00	54.50	55.85	55.78	54.48
05:00	54.50	55.85	56.14	54.50	17:00	54.50	55.85	55.76	54.52
06:00	54.50	55.85	56.16	54.48	18:00	54.50	55.40	55.74	54.48
07:00	54.50	55.85	56.16	54.50	19:00	54.50	55.40	55.71	54.50
08:00	54.50	55.85	56.12	54.48	20:00	54.50	55.40	55.71	54.50
09:00	54.50	55.85	56.07	54.50	21:00	54.50	55.40	55.67	54.50
10:00	54.50	55.85	55.99	54.50	22:00	54.50	55.40	55.65	54.52
11:00	54.50	55.85	55.92	54.50	23:00	54.50	55.40	55.63	54.48
12:00	54.50	55.85	55.87	54.52	24:00	54.50	55.40	55.62	54.52

Date & Time: GMT format Temperature set point: Fahrenheit or Celsius
SupAir - Recorder supply air RetAir - Recorder return air	PrRtTm - Primary return air PrSuTm - Primary supply air

Image - Temperature recordings
The above-mentioned print-out of temperature recordings can be provided if requested in advance at an extra charge.

Temperature digital display

Image - Temperature digital display The digital display will show the preset temperatures, container air temperatures, and user and fault codes. Temperatures can be checked whether the unit is on the ship, train or truck, or in a container yard. The user-friendly controller ‘scroll back’ feature can also display the supply, return, pulp temperature (if installed), and can be reviewed for the last 30 days – whether the unit is powered by a/c supply or backup battery – for easy temperature monitoring.

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