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Proper light. Uniform pressure. The chart surface should be flat as well as smooth for seamless data recording. The arm of the pen should be fitted with a hundred percent accuracy and properly locked as well. Some timing device should be used for the purpose of driving the chart at a uniform rate.

Common applications include temperature and humidity measurements, flow rates, pH, pressure, as well as a host of other process measurements. Circular chart recorders archive data points on a round chart over a timed interval.

A chart recorder is an instrument used to record various process and electrical signals. The most traditional chart recorders record data on paper. The paper is passed under a pen and the pen is deflected in proportion to the signal. The result is a graph or chart of the data.

In terms of operation, chart recorders come in three basic varieties: mechanical, electromechanical and electronic. Mechanical chart recorders use motorized clockwork mechanisms to roll paper under the pens.

To choose a chart recorder, you need to consider factors such as the number of inputs, the type of signals, the type of recording that is needed, whether or not alarms are needed, the style of communication interface that is needed, the environmental conditions in which the device will operate, and more.

The advantage of a circular chart is its intuitiveness: at a glance, it gives a complete history of each selected variable over a specified period?a truly continuous display of a trend's change with time.

Since the 1980s, as most industries moved away from chart recorders and replaced them with PC-based data acquisition products, engineers and technicians in certain applications continued using them. In fact, today you will still find a relatively large number of chart recorders in daily use at many power plants.