Communication Error String; Flow Error String - GE PanaFlow HT User Manual

Chapter 4. Error Codes and Troubleshooting

4.2.2 Communication Error String

The PanaFlow HT flowmeter electronics includes two independent sub-systems. The purpose of the Communication
error string is to convey to the operator an issue with communication between these two sub-systems.

4.2.3 Flow Error String

Flow errors are errors detected by the UMPU (Ultrasonic Measurement Processing Unit) in the course of making a
flow measurement. These errors can be caused by disturbances in the fluid, such as excessive particles in the flow
stream or extreme temperature gradients. The errors could also be caused by an empty pipe or other such issue with the
fluid itself. Flow errors are typically not caused by a malfunction of the flow measurement device, but by an issue with
the fluid itself.
Error Header
E29
E22
E23
76
Table 4: Communication Error String
Error Header
C1
Figure 28: Communications Error String
Table 5: Flow Error String
Error Message
VelocityWarning
SingleChAccuracy
MultiChAccuracy
Error Message
UMPU Comm error
E29 indicates that the flow rate has exceeded the range
of the LWL (lower warning limit) or UWL (upper
warning limit). The purpose of this warning is to alert
the operator that the flow rate is approaching the LFL
(lower functional limit) or the UFL (upper functional
limit). At the Warning Limit threshold, the flowmeter
will continue to measure flow and drive the SIL
output, but if the flow rate reaches the Functional
Limit threshold the SIL output will go to the
Dangerous Detected state until an Authorized User
intervenes. E29 gives the operator a chance to correct
the situation before going to the DD state.
E22 indicates that an error was detected on one of the
flow channels. This applies to multiple channel
systems only. For example, there may be an issue in
the channel 1 measurement but not the channel 2
measurement.
E23 indicates an error on multiple channels.
Explanation
PanaFlow HT User's Manual