IMPROVED MEASUREMENT QUALITY
HART-communicating devices provide accurate information that helps improve the efficiency of plant operations.
During normal operation, device operational values can be easily monitored or modified remotely. If uploaded to a software application, these data can be used to automate record keeping for regulatory compliance (e.g.,
environmental, validation, ISO9000, and safety standards).
Numerous device parameters are available from HART-compatible instruments that can be communicated to the control
room and used for control, maintenance, and record keeping (Figure 4).
Figure 4: Examples of Device Parameters
Sent to Control Room
Some HART devices perform complex calculations, such as PID control algorithms or compensated flow rate. Multivariable HART-capable instruments take measurements and perform
calculations at the source, which eliminates time bias and results in more accurate calculations than are possible when performed in a centralized host.
Some HART field devices store historical information in the form of trend logs and summary data. These logs and statistical calculations (e.g., high and low values and averages) can be uploaded into a software application for further processing or record keeping.
