Koehler Instrument Company
Summary Of Method
For measuring pour point, a portion of sample is slowly cooled in a bath which is not in direct contact with sample jar. Verifications for Pour Point are made, on each verification, sample is tilted looking for sample flow. Verifications are made until sample shows no flow for 5 seconds on horizontal position, at that moment Pour Point is reached.
For Petroleum Products, cloud point and pour point of a petroleum product is an index of the lowest temperature of its utility for certain applications.
The specimen is cooled at a specified rate and examined periodically. The
highest temperature at which a cloud is first observed at the bottom of the test jar is recorded as the cloud point. The lowest temperature at which movement of the specimen is observed is recorded as the pour point.
Pour Point Detection
The pour point detection system provides automated sample testing with the accuracy and repeatability in accordance with ASTM D97, D5853, D5950 and related international test methods. The automated operation
involves removing the sample from the cooling jacket at 3°C intervals and tilting it to a 90° angle as prescribed by the test method until no flow is observed. Contact of the cold sample with the two PT100 detection probes positioned just above the surface liquid level when the test jar is tilted identifies sample flow. The test jar is automatically returned to the cooling jacket and sampled again until no flow is detected for 5 seconds. The pour point result is then reported at 3°C higher than the temperature at which the sample ceased to flow in accordance with the test method.
Cloud Point Detection
The cloud point detection system provides automated sample testing with the accuracy and repeatability in accordance with ASTM D2500, D5771, D5772, D5773 and related international test methods. The sophisticated dynamic measuring system emits a light pulse every 1°C from a coaxial fiber optic cable positioned above the test sample. The light pulse is then reflected off the silver bottom test jar to an optical sensor. The advanced software package analyzes the response of the light pulse. The initial appearance of crystallization is monitored by light scattering, signifying the cloud point of the sample. All clear and transparent oils are readily measured by the detection system, regardless of sample color.
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