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Judul : Instrument Ranges Used in Process Control System Design
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Instrument Ranges Used in Process Control System Design
In process control design process variables such as temperature, pressure, flow, level, valve signals, analyzers etc are ranged in such a manner to be proportional to the primary signal as much as possible for control purposes. The table below shows the typical instrument scales employed in process control system design:
| Instrument Variable | Scale |
| Temperature | Direct Reading |
| Pressure | Direct Reading |
| Flow (differential) | 0 – 100 linear |
| Flow (Linearized) | 0 – 100 linear |
| Level | 0 – 100 linear |
| Analyzer | Direct Reading |
| Signal to Valves | 0 – 100% |
As far as possible, the instrument ranges will be selected such that the normal value will be between 50 and 75% of the adjusted range taking into account the specified minimum and maximum values and trip settings will lie between 10% and 90% of the adjusted range.
Typical accuracy of the pressure and differential pressure Smart transmitters will be +/- 0.25% of the calibrated span.
Typical accuracy of temperature Smart transmitters will be +/- 0.3% of the calibrated span.
Typical accuracy of the other transmitters will be as far as possible better than +/- 0.5%.
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