AWD-001 Multi-function Low-temperature Tester is designed and manufactured in accordance with the following equivalent ASTM methods:
Pour point ASTM D97
Cloud point ASTM D2500
Solidifying point Cold-filter plugging point: ASTM D6371 (equivalent principle)
AWD-001 Multi-function Low-temperature Tester is designed and manufactured in accordance with the following equivalent ASTM methods:
Pour point: ASTM D97
Cloud point: ASTM D2500
Solidifying point Cold-filter plugging point: ASTM D6371 (equivalent principle)
AWD-001 Multi-function Low-temperature Tester is designed and manufactured in accordance with the following equivalent ASTM methods: Pour point ASTM D97, Cloud point ASTM D2500, and cold-filter plugging point (ASTM D6371 equivalent principle). The instrument is suitable for determining the pour point ASTM D97, cloud point ASTM D2500, solidifying point and cold-filter plugging point of petroleum and petroleum products under these ASTM standards. Pour point ASTM D97 and cloud point ASTM D2500 are the most frequently requested tests in routine specification control, and the AWD-001 was planned from the outset to give reliable pour point ASTM D97 and cloud point ASTM D2500 data shift after shift with the minimum operator attention.
Performance Characteristics The AWD-001 Multi-function Low-temperature Tester is composed of the test assembly, a refrigeration unit, an electrically-controlled vacuum-filtration module, a stirring mechanism, and a digital temperature-control system. Each subsystem is built so that pour point ASTM D97 and cloud point ASTM D2500 determinations can be carried out in the same bath without hardware change-over, ensuring that pour point ASTM D97 and cloud point ASTM D2500 results are obtained under identical thermal conditions.
Test assembly The test assembly consists of test cups, filter assembly, calibrated pipette, low-temperature bath, and digital temperature regulator. The same bath cover accepts the jackets required for pour point ASTM D97 and cloud point ASTM D2500, so the operator can move from pour point ASTM D97 to cloud point ASTM D2500 without repositioning the refrigeration probe. This layout keeps the bath gradient within ±0.5 °C from top to bottom, a figure that is tighter than the tolerance quoted in both pour point ASTM D97 and cloud point ASTM D2500 documents.
Refrigeration unit The hermetic cascade compressor set is built with compressor, condenser, cascade condenser, capillary tube, and evaporator. The proven refrigeration technology gives low energy consumption and long service life, maintaining bath temperatures down to –70 °C for pour point ASTM D97 and cloud point ASTM D2500 work. Because pour point ASTM D97 and cloud point ASTM D2500 are run at 3 °C intervals, the controller stores a 3 °C step routine that can be triggered once the previous pour point ASTM D97 or cloud point ASTM D2500 threshold is reached, removing the need for the operator to reset the thermostat every cycle.
Electrically-controlled vacuum-filtration module (for cold-filter plugging point) The module integrates U-tube manometer, constant-level water vessel, suction pump, vent valve, and all required air lines in a single compact unit. Electrically controlled suction and venting eliminate the complicated manual setup specified in SH/T 0248 and give reliable, repeatable results. Although the module is primarily intended for cold-filter plugging point, the same hardware can be used to pre-condition samples before pour point ASTM D97 or cloud point ASTM D2500 if the specification calls for combined data. Having one common vacuum source for pour point ASTM D97, cloud point ASTM D2500 and cold-filter plugging point reduces bench clutter and prevents cross-contamination between pour point ASTM D97 and cloud point ASTM D2500 test cups.
Digital temperature-control system The microprocessor-based PID controller maintains bath temperature and displays both set-point and actual temperature in real time, allowing easy adjustment and offset correction. A built-in data logger stores the last one hundred pour point ASTM D97 and cloud point ASTM D2500 readings together with time stamps, so repeatability checks for pour point ASTM D97 and cloud point ASTM D2500 can be performed without external software. The controller firmware recognises the probe configuration for pour point ASTM D97 and cloud point ASTM D2500 automatically and switches the display units between °C and °F according to the method selected, removing a common source of transcription error when pour point ASTM D97 and cloud point ASTM D2500 values are transferred to certificates.
Technical Parameters
Power Input: < 2 200 W
Supply: AC 220 V ±10 %, 50 Hz
Temperature Range: Ambient To –69 °C
Temperature Stability: ±0.5 °C
Cool-Down Time: ≤ 100 Min
Bath Working Volume: 200 mm×90 mm×20 mm
(Two Independent Chambers)
Bath Medium: Anhydrous Ethanol
Cold-Filter Plugging Point Filtration Module:
– Power Input: 0.1 KW
– Differential-Pressure Range: 0 – 240 Mm H₂O
– Suction / Vent Control: Push-Button Electric Actuation
Multi-function Low-temperature Tester
Multi-function Low-temperature Tester
Multi-function Low-temperature Tester
Operational sequence for pour point ASTM D97 and cloud point ASTM D2500 After the sample is poured into the test jar and placed in the insulated collar, the operator selects either pour point ASTM D97 or cloud point ASTM D2500 on the touch screen. The bath then cools to the first checkpoint specified in pour point ASTM D97 or cloud point ASTM D2500, holds for the interval defined in pour point ASTM D97 or cloud point ASTM D2500, and prompts the operator to tilt the jar (pour point ASTM D97) or view the specimen (cloud point ASTM D2500). All checkpoints for pour point ASTM D97 and cloud point ASTM D2500 are stored in non-volatile memory, so even if power is lost during a pour point ASTM D97 or cloud point ASTM D2500 run the instrument resumes at the correct temperature when power returns. This feature is especially useful for overnight pour point ASTM D97 and cloud point ASTM D2500 work where the laboratory is un-manned.
Repeatability and reproducibility for pour point ASTM D97 and cloud point ASTM D2500 Factory acceptance tests show that the spread of pour point ASTM D97 results obtained on the same diesel sample over ten days is within 2 °C, better than the 3 °C reproducibility limit quoted in pour point ASTM D97. Similarly, cloud point ASTM D2500 spread is within 1 °C, compared with the 2 °C limit given in cloud point ASTM D2500. These figures are achieved by keeping the bath geometry identical for every pour point ASTM D97 and cloud point ASTM D2500 determination and by using the same platinum resistance thermometer for both pour point ASTM D97 and cloud point ASTM D2500, thereby removing sensor-to-sensor bias.
Maintenance and calibration for pour point ASTM D97 and cloud point ASTM D2500 The refrigeration circuit is sealed for life and requires no field charging. Calibration of the temperature sensor is checked with a certified thermometer at –40 °C and 0 °C, two points that bracket the normal range of pour point ASTM D97 and cloud point ASTM D2500. A two-point correction is accepted only if the deviation is within ±0.2 °C, a figure that is tighter than the ±0.5 °C tolerance allowed in pour point ASTM D97 and cloud point ASTM D2500. No other calibration is needed for pour point ASTM D97 or cloud point ASTM D2500, because the bath volume is small and the stirrer speed is fixed, giving identical heat-transfer conditions for every pour point ASTM D97 and cloud point ASTM D2500 test.
Safety and ergonomics The bath is insulated with CFC-free foam and the outer wall remains at room temperature even when the inner liquid is at –70 °C for pour point ASTM D97 and cloud point ASTM D2500. A magnetic lock prevents the lid from being opened while the compressor is running for pour point ASTM D97 or cloud point ASTM D2500, protecting the operator from cold burns and preventing spillage that could falsify pour point ASTM D97 or cloud point ASTM D2500 readings. All wetted parts in the pour point ASTM D97 and cloud point ASTM D2500 flow path are made of stainless steel or PTFE, eliminating the risk of corrosion that could contaminate the specimen and shift pour point ASTM D97 or cloud point ASTM D2500 by a degree or more.
Summary AWD-001 Multi-function Low-temperature Tester delivers pour point ASTM D97 and cloud point ASTM D2500 data with the repeatability required by commercial specification laboratories. By integrating pour point ASTM D97, cloud point ASTM D2500 and cold-filter plugging point in one cabinet, the instrument reduces bench space and capital outlay while ensuring that every pour point ASTM D97 and cloud point ASTM D2500 determination is traceable to the same calibrated sensor chain.
