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TEMPERATURE RECORDING SYSTEMS
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TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

Jan 15, 2016

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Louise Allen
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Page 1: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

TEMPERATURE RECORDING SYSTEMS

Page 2: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

Manually filled Logsheet

Page 3: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

Reefer container (Front)

Page 4: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

PARTLOW RECORDER

Page 5: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

PARTLOW CHART (Blank)

Page 6: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

PARTLOW CHART EXERCISE

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• Introduced as a back up for manual recording of temperatures

• Works as a stand alone unit not requiring external power supply

• Mechanical clock winding mechanism provides drive for a rotating chart.

• Provides continuous temperature recording for 31 days irrespective of power supply availability, whether container is empty or cargo loaded.

GENESIS

Page 8: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

• Provides only return temperature recording• Can be manually fudged – not 100% foolproof• Since it is a mechanical device, there is a little

amount of sluggishness and hunting.• Prone to damage from external elements even

though located in a protective enclosure• Needs regular calibration

Disadvantages

Page 9: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

• Subsequently replaced with Electronic datarecorder.

• However some container owners still persist with Partlow Chart as it provides a readily readable record of temperature.

Page 10: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

Location of Partlow Mechanism and Sensor

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Partlow Chart Mechanism

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• Stylus contact on chart is not correct

• System running with choked expansion valve passage or less refrigerant charge

Fault Finding from Partlow Charts

Page 13: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

Fault Finding from Partlow Charts

• Excessive Moisture in the Cargo Space

• Compressor Tripped

Page 14: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

1. Cargo Temp Setpoint: +8ººC

2. Date and Time of Plugging on board: 2nd noon

3. Temp at the time of plugging: 14ººC

4. Defrost Interval; 6 hours

5. Temp rise during Defrost: 3ººC

6. Start of Power Breakdown: 5th noon

7. Power restored: 5th midnight

8. Temp rise during power breakdown: 8ººC

9. Container Unplugged: 14th noon

Partlow Chart Exercise-Chilled Cargo

Draw a Partlow Chart based on the foll: data

Page 15: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

Identify +8ººC on the Chart and draw a light circle representing Setpoint

Identify and mark 2nd noon and 14ººC to identify the time and temp at plugging

Draw the curve to reduce the temp to 10ººC in 6 hrs Show a gradual increase of temp to 13ººC for max

period of 2 hrsAt the end of 2 hrs show a sharp drop of temp to

10ººC in about 1 hrRepeat the Defrost cycle after every 6 hrs.From 5th noon till 5th midnight show a gradual rise

of temp upto 18ººC

Partlow Chart Exercise-Chilled Cargo SOLUTION

Page 16: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

After power is restored at 5th midnight, show a rapid fall in temp upto 12ººC in 6 hours when the next defrost cycle starts.

Repeat the defrost cycle for 2 hours showing temp rise of 3ººC

After the next defrost cycle show temp fall upto 10ººC in about 1 hr

Repeat the cooling and defrost cycle till 14th noon when the container is unplugged

Thereafter show a gradual rise in temp.

Partlow Chart Exercise-Chilled Cargo SOLUTION Contd.

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1. Cargo Temp Setpoint: -15ººC 2. Date and Time of Plugging on board: 18th noon3. Temp at the time of plugging: -8ººC 4. Defrost Interval: 24 hours5. Temp rise during Defrost: 4ººC 6. Start of Power Breakdown: 22nd noon7. Power restored: 23rd midnight8. Temp rise during power breakdown: 5ººC 9. Container Unplugged: 30th noon

Partlow Chart Exercise-Frozen CargoDraw a Partlow Chart based on the foll: data

Page 18: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

Identify -15ººC on the Chart and draw a light circle representing Setpoint

Identify and mark 18th noon and -8ººC to identify the time and temp at plugging

Draw the curve to reduce the temp to -15ººC in 3 hrsMaintain the same temp for about 24 hrs till the start

of the first defrost cycle Show a gradual increase of temp to -11ººC for max

period of 2 hrsAt the end of 2 hrs show a sharp drop of temp to -

15ººC in about 1 hrRepeat the Defrost cycle after every 24 hrs.From 22nd noon till 23rd noon show a gradual rise of

temp upto -10ººC

Partlow Chart Exercise-Frozen Cargo SOLUTION

Page 19: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

After power is restored at 23rd noon, show a rapid fall in temp upto -15ººC in 2 hours and maintain it till the next defrost cycle starts.

Repeat the defrost cycle for 2 hours showing temp rise of 3 ººC

After the next defrost cycle show temp fall upto -15ººC in about 1 hr

Repeat the cooling and defrost cycle till 30th noon when the container is unplugged

Thereafter show a gradual rise in temp.

Partlow Chart Exercise-Frozen Cargo SOLUTION Contd.

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SOLUTION

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For Chilled cargoes, the minimum temp recorded on Partlow Chart is 2-3ººC more than the Setpoint Temp whereas for Frozen cargoes, the minimum temp goes as low as the Setpoint Temp. WHY?

The max. Defrosting time is 2 hrs. WHY?For Chilled cargoes, the rise is temp is faster than for

frozen cargoes - both during defrosting time and also during power breakdown. WHY?

Defrosting interval is 6 hrs and 24 hrs respectively for chilled cargoes and frozen cargoes. WHY?

Points to PONDER

Page 22: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

• Mechanical hand winding mechanism replaced by battery

• Design with 2 sensors used for non-transport applications.

• Electronic Partlow Recorders

IMPROVEMENTS ON PARTLOW CHARTS

Page 23: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

PARTLOW CHART (Used)

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LOCATION OF PARTLOW SENSOR

Page 25: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

• All Containers are equipped with Electronic Datarecorders. These provide continuous recording of the temperatures and events occuring in the machinery.

• It is a tamperproof device and the recorded data is accepted as evidence in the court of law.

Page 26: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

Information recorded in the Datacorder

• In many instances, shipstaff have been pulled up for not recording power breakdowns – whether planned or unplanned.

• This happens, particularly, if any cargo damage is noticed at the consignee’s end, when the datarecorder has recorded a power interruption, but same has not been logged by the shipstaff.

• The Datacorder is a “Black Box”. Nothing escapes its notice. It records even the slightest variation in temperature – minute by minute.

• BE CAREFUL – BIG BROTHER IS WATCHING!

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Data recorded in Datacorder – Good Cargo

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Power Breakdown

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Power Interruption and Back up Battery removed

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Frequent Power Interruptions

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Raw Data – Minute by Minute Recording

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Data from Carrier Datacorder

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Data from Carrier Datacorder Contd.

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Data from Carrier Datacorder

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Data from Thermoking Recorder

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RECORDED DATA

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Temperature Recorders inside Cargo

Page 38: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

LOCATION OF CARGO PROBES (USDA)

Page 39: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

Cargo probes Recorded Data

Page 40: TEMPERATURE RECORDING SYSTEMS. Manually filled Logsheet.

Remote monitoring modem

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FOUR WIRE SYSTEM