... , 50min, 55min, 60min (optional) 3. Applicable StandardThis instrument conforms to the standard of GB/T 387, ASTM D1551. 4. ScopeThis instrument applies ... and a test oil sample at the same time. Three air washing bottles used to purify the air have a capacity of not ... less than 250ml. BF-30A Sulfur Content of Dark Petroleum Products ...