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德國Herzog  
Herzog是PAC旗下的公司。

PAC是一個國際化的制造和服務集團，提供應用在不同領域的測試設備, 有超過250種的產品，主要用于石油、石化、食品和飲料行業，同時，PAC還提供藥物分析的解決方案。

PAC集合了世界上最好的油品分析儀器品牌，如Alcor, Antek, Herzog, ISL, PetroSpec和PSPI。產品線包括：閃點測定儀、粘度儀、蒸餾儀、瀝青材料測試儀、低溫性能分析儀、鹽含量分析儀、蒸氣壓分析儀、實際膠質分析儀、潤滑油蒸發損失測試儀、氮/硫分析儀、航空燃料熱氧化安定性測定儀、微量殘碳測定儀。

PAC旗下品牌產品的用戶已遍及六大洲。依靠著其廣大的經銷商網絡及優秀的銷售和服務團隊，PAC將繼續為用戶提供最出色的品牌和測試儀器。

                    
Herzog engineers continue to develop the latest technology for testing cold behavior, distillation, flash point, vapor pressure, viscosity and other physical properties.

Herzog by PAC, originally established in 1931 is a long-established, comprehensive line of laboratory instruments for testing atmospheric and vacuum distillation, flash point, vapor pressure, bitumen properties, cold flow properties, viscosity and other physical properties of materials. Distillation and flash point analysis is provided by systems including the OptiDist and the HDV 632; viscosity and Bitumen testing by systems such as the HVM 472 and the HRB 754 Ring & Ball; and fuel classification by systems such as the CID 510 Derived Cetane Number.

As a highly experienced provider of physical testing instruments, we are an active member in standards organizations and lead standard development to guarantee that the methods meet customer requirements of precision and ease of use.

A Pioneer and Innovator
Herzog early on pioneered efforts to automate traditional manual methods of testing in order to save manpower and eliminate user errors. Herzog also took the lead in efforts to develop and standardize new, alternative lab methods where the hallmarks were low sample volume requirements, achieving faster results, higher precision in analysis, and greater ease of use by operators with lower general skill levels.
Herzog provides complete solutions, including highly experienced customer service and certified reference materials for instrument calibration and validation.

From the start, Herzog has been an innovator in physical distillation. Herzog introduced its first automated ASTM D86 / ISO 3405 distillation system to the market in 1957. Today, Herzog continues to innovate in synergy with other members of the PAC technology family with its 5th generation system, the OptiDist, which combines 50 years of Herzog experience and 30 years of ISL to create a unique, state-of-the-art, fully automated distillation analyzer. OptiDist uses several patented technologies, such as Optimizer and bottom meniscus volume measurement, for fully automated distillation control that guarantees highest precision results, and it is ideal for new fuels including ethanol blends and biodiesel blends.