Appendix: HART Specific Information
ULTIMA X
®
Series
156
GB
13.17 Troubleshooting
Fault Indications
Span Fault
This fault can occur if the sensor is in cal mode and the required SPAN gas is not
applied to the sensor at the indicated time or within the timeout period. The 4-20 mA
returns the measured gas value. This fault sets several status flags in the digital out-
put to indicate that an error has occurred. The current calibration status can be ob-
served by right-clicking on status group 2 to expand it as shown in Fig. 50.
Other possible cause for a Span Fault could be the use of an incorrect Span gas or
improperly set PV Upper Trim point [Span] setting. The Trim [calibration] point in-
formation can be viewed from the sensor trim points menu as shown in Fig. 52.
Span faults can also be caused by a bad sensor, sensor at end-of-life, or a sensor
that is too far out of calibration for the Standard Zero/ Span procedure to make the
adjustment. An attempt to Initial Cal the sensor may be able to correct the calibra-
tion; otherwise, the sensor must be replaced. Additional sensor status can be ob-
tained by right-clicking on status group 3 to expand it as shown in Fig. 53.
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