The PXR105 circular chart recorder was available for a short time in the early 1990s. It enabled control of up to 2 loops and recording and display of up to 3 variables on a circular chart. The PXR105 was available with a flow totalizer option and a number of output options, including relays and mA outputs.
In 1994, the PXR105 was superseded by the C1900 circular chart recorder / controller. The C1900 enables control of up to 2 PID loops and up to 4 pen recording, with a totalizer if required. The C1900 has flow totalizer and profile control options and is completely upgradeable in the field.