Based on 20 years experience with rheometers for mortar and fresh concrete, Schleibinger has developed a new instrument called viskomat XL. The instrument is exclusively available from Rheology Solutions.
This rheometer fills the gap between the viskomat NT for mortar and paste with a specimen volume of 360 ml and the concrete rheometer BT2 with a sample volume of 20l. The principle of operation of the viskomat XL is nearly the same as for the viskomat NT. A mixer formed probe measures the torque, while the specimen vessel rotates and an additional scraper cleans the wall of the vessel.
Dynamic Speed Range
The speed – 0.001 to 100 rpm in both directions, clockwise or counter clockwise. The speed may be defined in several steps, as a linear increase or decrease of speed. As an option also an oscillating or a logarithmic mode is possible.
High Torque Range
The viskomat XL has a torque range from 0..500 Ncm with a resolution of 0.05 Ncm and accuracy better then 0.2 Ncm. Optionally a sensor with a torque range up to 1000 Ncm and a accuracy of 0.8 Ncm can be installed.
Temperature control is achieved by using a double wall specimen container, with a circulating cooling liquid. The specimen temperature is measured with a RTD mounted inside the shaft of the probe.
High Time Resolution
The sampling rate can be set from 0.005s .. 1min. Shear Stress Control Mode (optional) allows you to run the viskomat XL with a shear stress controlled mode. The torque is preset over time, and the speed is automaticly controlled to achieve the predefined torque.
The viskomat XL is controlled with a built in computer or via a network interface. TFT screen, keyboard and mouse are included.