Routine maintenance on a circular chart would include checking for ___

• A. Irregular movements
• B. Unstable trace
• C. Flat line
• D. Missing data

Answer: (A)

A circular chart recorder relies on a chart that rotates at a steady speed while the pen traces the process variable. Routine maintenance focuses on ensuring the drive and pen move smoothly and without hesitation. Irregular movements of the pen or trace indicate the mechanism isn’t rotating uniformly or the pen carriage is sticking, which would distort the recording. This is the most direct sign that the chart recorder’s motion is compromised and needs attention.

Other signs like a flat line, missing data, or an unstable trace point to problems as well, but they’re downstream symptoms. The fundamental issue you’d check first is whether the motion itself is irregular, since all the data on the chart depend on that steady motion.