A type of chart recorder where a long, vertically moving chart that passes under one or more pens moving horizontally in proportion to the recorded parameter. The combined effect is to draw a graph that reflects a process over time.
The active part of chart is typically 100mm or 250mm wide. It is common for the pens to be able make simple dot-matix annotations alongside the continuous trace, so that time and scaling information is also recorded.
Far more data can be recorded onto a strip chart than is possible with circular recorders, but these types of recorder are being replaced by paperless recorders or data loggers in many applications.