Chart Recorders: Essential In Industrial Works

2008-01-02 11:33:57

( Computers )



The presence of various types of chart recorders in utility and industrial plants shows that these measuring instruments are of primary importance in a number of industrial works. Their advantage is the ability to present a visual but calibrated representation of the continuous record of changes occurring in the parameters being measured. Chart recorders of are three types: strip recorder, circular recorder, and X-Y recorder.

Strip Chart Recorders

Strip chart recorders, like seismographs and electrocardiographs, present data on a continuous roll of chart paper moving at a regulated speed. The recorder would take note of the changes over time in the variables being measured; thus, they also serve as time recorders. A pen or stylus used to make marks on a movable paper, a pen driving system, a long roll of chart paper and its drive mechanism that move vertically, and a chart speed selector switch are the basic elements of strip chart recorders.

Circular Chart Recorders

Circular chart recorders record the data on a flat circular chart. Their basic elements include a measuring element, an operating mechanism, a recording device and a chart drive, all of which can be mounted on one panel. To get an optimum recording condition of circular chart recorders, you must ensure that there is a light uniform pressure, and a smooth flat chart surface.

X-Y Chart Recorders

X-Y chart recorders are usually found in research fields, because it is often important to researchers to plot the relationship between two variables, instead of plotting each one with respect to time. These recorders are often used to measure electrical characteristics of materials, such as resistance versus temperature, speed-torque characteristics of motors, and many others.

Industrial plants use chart recorders to acquire hard copy from their data input. With appropriate software and hardware, chart recorders can draw grids and annotate charts according to their analytical needs.


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