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ASTM D4539 Low Temperature Flow Test (LTFT) is generally recognized as a better predictor of diesel fuel filter plugging temperature than the more commonly used IP-309 Cold Filter Plugging Point (CFPP). The test, however, is not widely used since it is long and tedious, requiring operator attention at inconvenient times.
Three models are available. Common to all 3 models for fully automated determination of Low Temperature Flow Test of fuels by ASTM D4539 are:
A semicircular arrangement of sample beakers such that filter distance to the receiving beaker of each sample is exactly the same. This is to insure that all dimensions of the apparatus are identical to the specifications of ASTM D4539. A common receiver beaker is used for all samples and is automatically drained in preparation for the next test.
The test starts with the operator installing 1 to 6 sample beakers into the bath. After inserting the filter holders and making the connections for the vacuum, the computer program is started. No further operator attention is needed ‘till all samples have been tested.
When the sample cools to the pre-selected temperature, the vacuum is automatically applied and the time recorded when the vacuum breaks (i.e. all the sample has been filtered). The pass temperature is when the filtration time is less than 60 seconds. Cooling continues at 1°C/hour and the next sample is filtered as before.
The full process is controlled by a proprietary software running on a Windows 95/98 based PC computer. The software allows the operator great flexibility to configure the test parameters, etc. All results are stored on the computer allowing the data to be downloaded for future review, statistical analysis, or printing.
Refrigeration is provided by two hermetically sealed compressors in a cascade configuration using ozone friendly refrigerants. Temperature control is provided by a digital PID controller that communicates with the PC.
Model 362 uses a liquid bath with 6 sample capacity. It is a research model with a laser detection of the filtered volume and plots the volume in the receiver with time. The pass temperature is determined by loss of vacuum (i.e., all the sample has filtered). Model 362 comes complete with an electronic vacuum regulator, vacuum pump, laptop PC, and all needed accessories (glassware, filter assemblies, etc.)
Model 289 is similar to Model 362 with 6 sample capacity. It is a pass/fail model where the pass temperature is determined by loss of vacuum (i.e., all the sample has filtered). Model 289 includes an electronic vacuum regulator, but does NOT include the receiver level detection, vacuum pump, Windows PC, nor all needed accessories (glassware, filter assemblies, etc.). A computer with RS 232 port is required.
Model 418 is a directly refrigerated dry bath (no alcohol needed) with a capacity of 2 sample. It is an economical automated apparatus in a compact bench top unit. It is particularly useful in a production control laboratory. As with Model 289, it does not include the laser level detector. A tube immersed in water is used to regulate the vacuum in place of the electronic vacuum regulator. Not included with Model 418 are vacuum pump, Windows PC, nor all needed accessories (glassware, filter assemblies, etc.). A computer with RS 232 port is required.
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265-4L
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4
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Manual - Liquid
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+15ºC to -55ºC
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Bench
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28x28x15
(71x71x38)
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250/18
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265-10A
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10
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Manual - Air
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+15ºC to -55ºC
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Floor
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28x36x43
(71x91x109)
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440/14
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265-203L
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12
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Manual - Liquid
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+15ºC to -55ºC
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Floor
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28x36x43
(71x91x109)
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450/41
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289
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6
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Automated - Liquid
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+15ºC to -55ºC
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Floor
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36x28x37
(91x71x94)
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455/38
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362
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6
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Automated - Liquid
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+15ºC to -55ºC
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Floor
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36x28x37
(91x71x94)
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525/42
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418
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2
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Automated - Dry
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+15ºC to -55ºC
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Bench
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28x30x27
(71x76x69)
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275/18
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LIFT-10A
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Filter assembly (including creen)
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LIFT-10B
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Filter assembly (including screen) (12)
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LIFT--11A
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Replacement screen
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LIFT-11B
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Replacement screen (12)
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LIFT-11C
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Replacement "O" rings (12)
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LIFT-11D
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Replacement teflon washer (12)
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LIFT-12
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300 mL sample beaker (12 pack) |
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LIFT-13
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400 mL tall beaker (180 mL by 10 mL) |
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LIFT-14
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vacuum pump (oil-less rotary vane - 115 volt) |
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LIFT-15
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4" vacuum gauge 0-25 kPa (1% accuracy) |
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LIFT-16
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Automatic eletronic vacuum controller |
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LIFT-17
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Vacuum control valve |
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LIFT-18
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Table top mounting braket for gauge and valvu |
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LIFT-20
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Ball and joint with glass tubing and flex tubing (1 needed for each 300 mL sample beaker) |
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LIFT-21
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Storage lid for sample container (1 needed for each 300 mL sample beaker) |
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LIFT-22
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Stopper assembly including rubber stopper with two tubes, hose barbs, one tube to pinch clamp (1 needed) |
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Specifications are subject to change without notice. |
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