The HZZS - 100B automatic lubricating oil evaporation loss tester is designed in line with standards such as SH/T 0059 and ASTM D5800 B. Its Test Method A and Test Method B are both based on the Noack method for measuring the evaporation loss of lubricating oils, but they differ significantly in heating methods, temperature measurement accuracy, safety and environmental protection, etc. Method B is even designed to replace Method A in this instrument. The specific differences are as follows:
Heating and temperature measurement methods
Test Method A: It adopts a metal bath heating method with Wood's alloy. The Wood's alloy is filled in the bath body to enhance heat conduction. However, this method only measures the temperature of the constant - temperature bath instead of the temperature of the lubricating oil sample directly. There may be a temperature difference between the bath temperature and the actual temperature of the sample, which will have a certain impact on the accuracy of the test results.
Test Method B: It abandons the use of Wood's alloy and adopts an environmentally - friendly lightweight heating unit. Moreover, it can directly measure the temperature of the sample. For example, a temperature sensor can be inserted into the evaporation crucible to monitor the temperature of the lubricating oil in real - time. This way, it can ensure that the sample is heated at the set temperature (usually 245.2℃ ± 0.5℃), which greatly improves the accuracy and stability of temperature control during the test.
Safety and environmental performance
Test Method A: Since Wood's alloy is used, it may bring hidden dangers during the test process. When heated, Wood's alloy may produce harmful substances or cause safety accidents such as scalds if it leaks. In addition, the disposal of waste Wood's alloy will also cause a certain degree of environmental pollution, failing to meet the requirements of green and environmentally - friendly testing.
Test Method B: As it gets rid of the dependence on Wood's alloy, it fundamentally avoids environmental pollution and personal injury caused by Wood's alloy. At the same time, the instrument is equipped with a built - in diagnostic program and various alarm functions. If there are abnormal conditions such as excessive temperature during the test, it can send an alarm in time, which improves the safety of the test operation.
Operational convenience and test efficiency
Test Method A: The process of filling and replacing Wood's alloy is cumbersome. After the test, the cleaning of the heating bath is also time - consuming. In addition, due to the indirect temperature measurement method, it is necessary to spend extra time to calibrate the temperature difference between the bath body and the sample, which reduces the overall test efficiency.
Test Method B: The instrument is controlled by an embedded operating system and a high - speed microprocessor, with a touch - screen operation interface. The test parameters can be set easily. After the test, you only need to input the sample quality data, and the system can automatically calculate the evaporation loss. After the test, there is no need to clean up the Wood's alloy, which simplifies the post - test work and improves the test efficiency.
Applicable scenarios
Test Method A: It is more suitable for some traditional low - precision test scenarios or situations where there are special requirements for the traditional Wood's alloy heating process. However, due to its shortcomings in environmental protection and accuracy, it is gradually being phased out in modern standardized testing.
Test Method B: It is widely applicable to the evaporation loss testing of various lubricating oils and lubricating oil base oils. It is especially suitable for high - precision testing scenarios such as industrial production quality control and laboratory research. It can also meet the testing needs of modern environmental protection and safety specifications, so it has become the mainstream test method of the HZZS - 100B tester.