DHR Series Getting Started Guide Page 18
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 Figure 3
), until
the company was purchased by TA Instruments in 1993. 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 Instru-
ments. Both these instruments used air bearings, but the limits of that technology appear to have been
reached, and for the AR-G2 (Figure 4
), 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 transient performances of the instrument.
Figure 3 CSL
2
.
Figure 4 AR-G2.
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