Abstract: he rheological measurement of high viscous mat- erial(such as original coal slurry, city sludge, paper pulp and such industrial byproducts or solid waste) has important signif-icance in the project of pipeline transportation of these matter. Under normal pressure and without adding additives, viscous and dense material with high concentration is a kind of separate agglomerate material without characteristic of fluid. If using common rotational rheometer, it is impossible to test the rheol- ogical characteristic. However, under high pressure, viscous and dense material with high concentration will become conti- nuous slurry with characteristic of fluid. So a new sort of high- pressure rotational rheometer of high viscous material (maxi- mum operating condition is 20 Mpa) is researched and manuf- actured. The structure and the process of calibration are repo- rted. After the test of calibration and use, the device can well fit for measuring the viscosity of high viscous material. It is superior in the degree of the automatization and facile in the automatic collection of data.

Key words: Calibration, Rheological property, Rotational viscometer, Viscosity