Red Seal Instrumentation and Control Technician Practice Exam

What is the main purpose of a data logger?

1. To control operational parameters in real-time

2. To record and store sensor data over time

3. To visualize data trends on screens

4. To provide alarms for out-of-bounds readings

The correct answer is: To record and store sensor data over time

The primary role of a data logger is to continuously record and store sensor data over a specified period. Data loggers capture information from various sensors, such as temperature, pressure, or humidity, and store this data for analysis. This function is crucial in many industries, as it allows for long-term monitoring of processes, enabling operators to make informed decisions based on historical data. Data loggers are often equipped with memory storage to keep the recorded data so that it can be reviewed later. This stored information is essential for tasks such as trend analysis, regulatory compliance, and performance evaluation. By examining logged data, technicians can identify anomalies, establish patterns, and improve system efficiency. While other options have their own valid purposes, they do not capture the core functionality of a data logger. The control of operational parameters in real-time pertains more to control systems variable management, visualization pertains to dashboarding or software applications that provide a graphical display of data but not its storage, and alarms relate to immediate alerts for direct interaction rather than the broader data recording aspect that a data logger specializes in. Thus, the focus of a data logger lies in its ability to systematically gather and preserve data over time for later analysis and insights.