TA AR-G2, Getting Started Manual

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Page 20 AR-G2/AR 2000ex/AR 1500ex Getting Started Guide
Carri-Med acquired the rights to the Weissenberg rheogoniometer in 1990, but the mainstay of its business
remained the CMT successors to the Deer, which included the CSL and CSL2 (shown in , until the com-
pany was purchased by TA Instruments in 1994. From that time on, progress in CMT technology has been
remarkable, with the AR 1000 launched in 1996 and the AR 2000 in the year 2000 by TA Instruments.
Both these instruments used air bearings, but the limits of that technology appear to have been reached, and
for the AR-G2, launched in 2005, a magnetically levitated bearing was used. This and other developments
by TA Instruments have advanced the instrumentation further. Developments, for example, in the drag cup
motor and the electronics, have led to substantial improvements in the low torque, controlled rate, and tran-
sient performances of the instrument. TA Instruments' AR-G2 is now the world's most advanced CMT rhe-
ometer. Some of the improvements made in the electronics and other components of the rheometer have
also been incorporated into the AR 2000 to form the AR 2000ex and AR 1500ex.
Figure 3 CSL
2
.