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PRECISION PETROLEUM TESTING INSTRUMENTS

Filterability of Diesel Fuels by Low Temperature Flow Test (LTFT) – ASTM D4539

 

Fully Automated Apparatus for the Determination of Low Temperature Flow Test (LTFT)

Fully Automated Apparatus for the Determination of Low Temperature Flow Test (LTFT)

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 ASTM D6371 Cold Filter Plugging Point (CFPP). Please review ASTM D975-08a Appendix X5.1.3 for more Historical Background. Lawler’s automated units remove the tedium of the test and need for operators to run tests at inconvenient times.

Lawler automated models are liquid baths with 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 software running on a Windows based PC computer or laptop. The software allows the operator flexibility to configure the test parameters. All results are stored in XML format on the computer allowing future review, statistical analysis, printing in the software or import into a spreadsheet such as MS-Excel®.

Refrigeration is provided by two hermetically sealed compressors in a cascade configuration using ozone friendly refrigerants. Temperature control is provided by a digital temperature controller that communicates with the software.

Model 362 is 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 fully equipped, complete with an electronic vacuum regulator, vacuum pump, PC or laptop, and all needed accessories (glassware, filter assemblies, etc.)

Model 289 is similar to Model 362 also with 6 sample capacity, but does NOT include the receiver level detection feature. It is a pass/fail model where the pass temperature is determined by loss of vacuum (i.e., all the sample has filtered). Like Model 362, Model 289 comes fully equipped with accessories.

  • All models conform to ASTM D4539
  • Fully automated operation
  • Eliminates the tedium of the manual test
  • User friendly Window based software
  • Adjustable cooling rate from 0.1 to 5°C/hour
  • Operating range from +15° to -55°C
  • Liquid bath stability of better than ±0.1°C
  • Two 6 sample capacity models to choose from
Model NumberSample CapacityBath TypeTemperature RangeModel TypeCabinet DimensionsShip Weight lbs/cu.ft
2896Automated – Liquid+15ºC to -55ºCFloor36x28x37 (91x71x94)455/38
3626Automated – Liquid+15ºC to -55ºCFloor36x28x37 (91x71x94)525/42
265-10A10Manual – Air+15ºC to -55ºCFloor
265-12L12Manual – Liquid+15ºC to -55ºCFloor
265-4L4Manual – Liquid+15ºC to -55ºCBench
Part NumberDescription
LT-2ATest Assembly (LT-10, 300 mL beaker, LT-19A, LT-21A), each. (1 per position)
LT-13A400 mL beaker for automatic unit
LT-14AVacuum pump for automatic unit
LT-19ASocket joint 90° glass tube with flex tubing and B/S clamp (1 per position)
LT-20ABall joint and flex tubing
LT-21ACover for 300 mL sample beaker, two holes (1 per position)
LT-23AGlass stirring tube (1 per position)
LT-23BQuick connect socket with tubing (connects to LT-23A)
LT-10Filter assembly (filter body, o-ring, filter screen, brass washer, teflon washer, brass locknut)
LT-11BFilter screens, per dozen
LT-11CO-rings, per dozen
LT-11DTeflon washer, per dozen
LT-12300 mL tall sample beakers, per dozen
LM-PCLawler supplied computer configured with software
LT-CSFTReplacement rack to hold 500 mL sample jars for D7501
Part NumberDescription
LT-2MTest Assembly (LT-10, 300 mL beaker, LT-27M, LT-25M, LT-26M) (1 per position)
LT-13M400 mL tall receiver beaker (only 1 required)
LT-VPS1Vacuum pump system (115 VAC)
LT-VPS2Vacuum pump system (220 VAC)
LT-22MStopper assembly (flex tube, pinch clamp, 90° inlet and outlet tube) (only 1 required)
LT-25MReplacement cover for 300 mL sample beaker, 1 hole (1 per position)
LT-26MReplacement socket joint 90° glass tube with flex tubing and B/S clamp (1 per position)
LT-27MReplacement glass stem with ball joint and flex tubing (1 per position)
LT-10Filter assembly (filter body, o-ring, filter screen, brass washer, teflon washer, brass locknut)
LT-11BFilter screens, per dozen
LT-11CO-rings, per dozen
LT-11DTeflon washer, per dozen
LT-12300 mL tall sample beakers, per dozen
LM-PCLawler supplied computer configured with software
LT-CSFTReplacement rack to hold 500 mL sample jars for D7501
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