| Popis: |
A process transmitter is a device that senses a physical parameter (pressure, temperature, etc.) and generates an output signal proportional to the measured input. The term “smart” is more of a marketing term than a technical definition. There is no standardised technical definition for what smart really means in practice. Generally, in order for a transmitter to be called smart, it will utilize a microprocessor and should also have a digital communication protocol that can be used for reading the transmitter’s measurement values and for configuring various settings in the transmitter. A microprocessorbased smart transmitter has a memory that can perform calculations, produce diagnostics, etc. Furthermore, a modern smart transmitter typically outperforms an older type of conventional transmitter regarding measurement accuracy and stability. For the engineers who need to configure and calibrate the transmitter, the digital communication protocol and the open access to a myriad of critical configuration parameters are the biggest differences compared to conventional analogue only transmitters and as a result of these differences there is a significant risk to process safety, quality and metrology if good practice is ignored. |
