Chart Recorders

A chart recorder tracks and records process variables like temperature, pressure, flow, or humidity over time. A pen or stylus moves in response to an input signal, drawing a line on paper that represents the measurement. The paper can be a linear strip or a rotating disc, showing trends at a glance while keeping a permanent record.

Chart recorders give you an immediate, easy-to-read record of process data. Paper outputs are tamper-evident, making them valuable for audits and compliance. They are simple to operate, requiring no complex software, which makes them ideal in environments where digital systems are impractical or a permanent record is needed.

There are several options depending on your process. Strip chart recorders use a long roll of paper for continuous logging, while circular chart recorders rotate a disc over set cycles for batch or recurring processes. Modern paperless recorders store data electronically, display trends on a screen, and save records for later review.

They are widely used in industries where accurate process documentation is critical. Food and pharmaceutical production use them to monitor temperature and humidity, utilities track flow and pressure, and environmental monitoring programs rely on them for long-term data. Their visual traces make it easy to spot anomalies quickly.

Reliable readings start with proper installation. Mount the recorder on a rigid, level surface, and ensure the pen or sensor is free from stress. Match paper type and speed to your recording duration. For paperless models, check memory capacity and backup options. Environmental factors like temperature, moisture, and dust should also be considered.

Many include signal conditioning, filtering, and error detection to maintain a steady trace. Paperless models often offer memory backups and user-friendly interfaces, while analog recorders use sealed pens and inks designed to remain clear and legible over time.

Maintenance is minimal but essential. Paper-based recorders need chart and pen replacements and occasional cleaning of the drive mechanism. Paperless units require monitoring of memory usage, checking backups, and periodic validation. Regular care helps maintain accuracy and extend device life.

Consider the variables you need to monitor and whether one or multiple channels are required. Choose strip or circular charts based on recording duration, and decide between paper-based or paperless systems for your workflow. Check environmental suitability and, if needed, digital communication compatibility.

Chart recorders provide a clear, instantly readable output that requires no software. The physical record is permanent and tamper-evident, making it ideal for audits and compliance. In environments where electronics may be vulnerable, a chart recorder offers a simple, dependable, and reliable way to track critical process variables.