The demarcation with the pure hydrocarbon toluene or the cyclo-hexane, the toluene must conform to GB684, the cyclo-hexane must conform to GB14305, the purity ≥99.5%.after * pure hydrocarbon demarcation, is disturbed the environment the cryoscope after the pure hydrocarbon demarcation cannot automatic compensation factor and so on ambient temperature, humidity, atmospheric pressure and altitude above sea level influences.after * pays the sign fuel calibrates the instrument demarcation, the use conforms to the GB/T386 request vice-standard fuel calibration. measuring range: GB252 light diesel oil: 10#, 0#, - 10#, - 20#, - 35#, - 50#. reading scope: diesel oil cetane number 30-70 (CN) diesel oil cetane index 35-70 (CI) testing environment: ambient temperature 5℃~40℃ relative humidity ≤90% accuracy: (95% fiduciary level) duplication: 0.9/CN reproducibility: 2.0/CN has the parallel interface, the printout standard report format. The reserves is big: The test report, the test data may the random packing and the read, can save 60,000 reports. Tests a test specimen only to need 5 seconds every time. Low consumption: The demarcation each time only needs 80-100ml with the pure hydrocarbon and the test with the standard sample, the consumption is short in 1%, namely each time consumes also 1ml.