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What are Chart Recorders?

10/18/2013 10:35:59 AM | by Anonymous

Chart Recorders

The first chart recorder was designed by American inventor J.C. Stevens for the environmental monitoring while working for Leupold & Steves in Portland, Oregon. A patent for the chart recorders was issued by William Henry Bristol in 1888 before Leupold & Steves start manufacturing the chart recorders.


Chart recorders are still used in applications where instant visual feedback is required or where users do not have the opportunity, need or technical ability to download and view the data on a computer or where there is no electrical power is available such as an oil rig, in hazardous zones or in remote ecological studies. However, data loggers’ are decreasing in cost and power requirements allow them to increasingly replace chart recorders even in situations where battery power is the only option.


Chart recorder is an instrument used to record electrical signals and various processes. The traditional chart recorders were using paper to record data. The paper is passed under a pen and is deflected in proportion to the signal. As a result, the finished recording data is a chart or graph of the data. They are available in multi-channel or single styles and in various configurations. In today’s chart recorder, they can also record information in a digital format for download to a computer.


Chart recorder is an electromechanical device that records a mechanical or electrical input trend onto a piece of paper which is the chart. A chart recorder can record several inputs using different color pens and may record onto strip charts or circular charts too and may be entirely mechanical with electro-mechanical, clockwork mechanisms with an electrical clockwork mechanism for driving the chart with pressure or mechanical inputs or entirely electronic with no mechanical components at all.


The chart recorders are built in three primary formats such as strip, circular and roll chart recorders. Strip chart recorders have a long strip of paper that is ejected out of the recorder. The signal will change the pens deflect producing the result chart. They are well suited for recording of continuous processes and are commonly used in laboratory and process of measurement applications.


As for the circular chart recorders, they have a rotating disc of paper that must be replaced more often but they are more compact and amenable to being enclosed behind glass. They are ideal for batch processes where a set of process time is known.


These charts are normally designed to rotate in standard time periods such as 24 hours, an hour or 7 days whereas roll chart recorders are similar to strip chart recorders except that the recorded data is stored on a round roll and the unit is usually fully enclosed. They are also pre-dated electronic data loggers which have replaced them in many applications.

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