Instrumental electronics manufactures a circular chart recorder, series 4000. These circular chart recorders are suitable for recording parameters such as temperatures, flow, pressure or ph, etc, with the help of appropriate transducers. This is housed in sheet metal cabinet of dimensions 390 [h] x 390 [w] x 180 [d] mm. The recorder calibration accuracy is better than 0.75% of full scale. Sensitivity is better than 0.15% of full scale. Chart width is 250 mm. Recording is continuous with disposable felt pen. Pen speed is 6 seconds for full scale. The chart drive speed is 1 revolution in 24 hours or 12 hours or 6 hours, with the help of synchronous geared motor. Built-in on/off or proportional controller with 4-digit led display is optional.