GE PanaFlow HT User Manual page 88

Chapter 4. Error Codes and Troubleshooting
E28
E31
The flow errors in Table 4 are listed in order of increasing priority. For troubleshooting tips, see "Diagnostics" on
page 80.
78
Table 5: Flow Error String (cont.)
SIL
NotCalibrated
E28 is a SIL (Safety Integrity Level) error, which
means we have a measurement condition that could
lead to a false reading and we must stop providing a
flow measurement to the SIL output. This will drive
the SIL output to the DD state and stop providing flow
readings to the SIS.
E31 is an indication that the flowmeter has not been
calibrated. This means we cannot be sure of flow
measurement accuracy.
PanaFlow HT User's Manual