Petroleum testing is the analysis during upstream, midstream, and downstream production processes of petroleum products. It is most commonly used to test petroleum product, its product components, byproducts of crude oil, fuel, natural gas, upstream oil and gas and other formats of petroleum. - Can re-evaluate every test curve.By setting the evaluating time range, take certain section of curve to evaluate, whcih can avoid some sections with abnormal data caused by washing, sample or other reasons. Independent flow control system can automatically control flow of every sample.