Dual input advanced industrial transmitter has many built in functions Courtesy Azbil |
There are a variety of instruments and methodologies for measuring temperature, the most common of which is probably direct contact between the target substance and an appropriate temperature sensor. Industrial process applications are commonly served by thermocouples or resistance temperature detectors (RTD), chosen for their cost, accuracy, and flexibility of installation.
Every operating process is "critical" to some group of stakeholders. The process may be of great importance for a number of reasons:
- The process output may serve as an input to another process with great value.
- The process output may be of great direct value to the stakeholders.
- The process may have significant levels of hazard associated with improper or out of control operation.
- Out of control operation may result in substantial financial loss to the stakeholders.
- Switch to the backup sensor if the primary has a failure indication.
- Alert the operator if the deviation between the two sensor readings indicates sensor drift.
- In wide range temperature applications, switch between sensors with differing measurement ranges for better accuracy.