Technical information

20
Performance characteristics
Accuracy HART sensors
Accuracy of all data from connected HART sensors depends on the type and installation of instruments. The
use of the digital HART protocol prevents accuracy data degradation, as would be the case with analogue
(4...20 mA) sensors.
Spot RTD input, analogue inputs, analogue outputs
see above, "Technical data of the IS inputs and outputs
Resolution Resolution of all measured data depends on sensor and communication settings. The following settings are
recommended for inventory and custody transfer applications:
For purpose of consistency all internal calculations are performed in SI units.
Scan time HART sensors
The data of connected HART sensors is constantly scanned and updated in the internal data base. The scanning
sequence is based on the priorities of the measurements (level - prio 1, temperature - prio 2, pressure - prio
3,...). Typically, a value change on the HART multidrop loop is displayed after a 2 seconds delay (for priority 1
values).
Spot RTD input
RTD resistance is measured and recalculated at least every second.
Data type Units Inventory control Custody transfer
Level
millimeters 1 mm 1 or 0.1 mm
meters 10 mm 1 or 0.1 mm
feet 0.01 ft 0.01 ft
inches 1" or 0.1" 0.01" or 0.001"
ft-in-16 1/16" 1/16"
Temperature
°C 0.1 °C 0.1 °C
°F 0.1 °F 0.1 °F