Example: Use a linear gauge

In this example, the linear gauge monitors the temperature in a chemical reactor.
Create a linear gauge and assign a tag to the
Value
 connection. Set the setpoint, target value, control limits, and thresholds. The application reads the
Value
 connection and updates the linear gauge by moving the value indicator along the side of the gauge.
See how the current value changes in reference to the linear gauge components throughout the process:
  • Initial phase
    The setpoint defines the immediate temperature value that the PID controller aims to maintain. For example, the PID controller maintains the setpoint at 200°C to start the reaction.
  • Ramping phase
    The target value defines the broader goal for the reactor's temperature over time, for example 600°C. In this case, the system gradually adjusts the setpoint to finally reach the target value of 600°C after a ramping period.
  • Monitoring and adjustments
    The control limits are defined to ensure safe and efficient operation. For example, the control limits might be set between 150°C and 650°C to prevent overheating or underheating.
    The thresholds are specific points that trigger alarms. For example, a threshold might be set at 620°C to prompt an alarm if the temperature crosses the upper threshold. Operators must make necessary adjustments to prevent overheating and ensure that the reactor operates safely.
  • Completion
    Once the target value of 600°C is reached, the system maintains this temperature until the reaction is completed. The linear gauge continues to display real-time data, helping operators ensure that the process remains stable and efficient.
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