Xylem XL Series H-522 - Plus - Manual (Page 209)

XL™ Series
4 To 20 Milliamp Output 18-3
In this example:
(20 - 4) / (50 - (-50)) = 16/100 = 0.16mA per degree change.
The resolution of the output signal can also be calculated based on the resolution of the DAC
(digital to analog converter). If the DAC has a resolution of 12 bits which is 1 part in 4096 we
can calculate the resolution of the source based on the following equation:
Input Range / 4096 = resolution
In this example: 100 / 4096 = 0.02441 degree.
If the DAC has a resolution of 16 bits then it is 1 part in 65536. In this case the resolution is
much greater.
Input Range / 65536 = Resolution
In this example: 100 / 65536 = 0.001526 degrees.
If the hardware revision is 3.3 or newer a 16 bit DAC is used and hardware revisions 3.1 and
older use a 12 bit DAC.