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.
COST SAVINGS IN
MAINTENANCE
The diagnostic capabilities of HART-communicating field devices can eliminate substantial costs by reducing downtime. The HART protocol communicates diagnostic information to the control room, which minimizes the time required to identify the source of any problem and take corrective action. Trips into the field or hazardous areas are eliminated or reduced.
When a replacement device is put into service, HART communication allows the correct operational parameters and settings to be quickly and accurately uploaded into the device from a central database. Efficient and rapid uploading reduces the time that the device is out of service. Some software applications provide a historical record of configuration and operational status for each instrument. This information
can be used for predictive, preventive, and proactive maintenance.
