J57/J157AB Refractometer Technical Bulletin J57AB /J157AB Refractometers for measurement of urea concentration for diesel engine additives Standards Designed in accordance with DIN 70071 / ISO 22241-2 Basic operation The J57AB is a sub model of the J57HA and most details on the Technical Bulletin 925 apply, the J157AB is a sub model of the J157 and most details on Technical Bulletin 911 apply. The differences between the AB and the standard models are; Temperature Both instruments have improved temperature performance to better than 0.02oC meeting the requirements of DIN 70071 / ISO 22241-2 Scale The J57AB displays results in refractive index and the operator then uses that result to calculate the wu number. The J157 has the calculations built in to display and print the wu number. Optional accessories The J57AB refractometer can be supplied with the same range of accessories as the standard J57 including; - Printers - Computer software - Barcode reader - Automatic sipping system - Autosampler J157AB Rudolph Research Analytical 55 Newburgh Road, Hackettstown, NJ 07840 • 973-584-1558 Fax: 973-584-5440 • Email: [email protected] • Internet: www.rudolphresearch.com