Path Error Handling - GE PanaFlow HT User Manual

Appendix E. Special Applications
E.2 Path Error Handling
One program parameter that is in the menu map but not used by the PanaFlow HT is 2-path Error Handling. However,
an explanation of this parameter is included here for future reference.
In this context, a "path" is a measurement channel in the flowcell. The PanaFlow HT electronics is compatible with
five possible path configurations, two of which are released for purchase. The five configurations are:
1. Single mid-radius path
2. Single diameter path
3. Two mid-radius paths
4. Two crossed-diameter paths
5. Three paths - 1 diameter and 2 mid-radius
PanaFlow HT offers options 2 (PanaFlow Z1H) and 3 (PanaFlow Z2H). One can also purchase the PanaFlow R2H,
which consists of two sets of redundant electronics, each set up as option 2 above.
The 2-path Error Handling technique only applies to a system with two or more paths. For multi-path systems, the
technique only applies to symmetrical pairs of paths, or "sister" paths. For applicability, see the table below:
3. Two mid-radius paths
4. Two crossed-diameter paths
5. Three paths - 1 diameter and 2
mid-radius
With the physical layout in mind, the error handling technique should be fairly simple to understand. The theory is that
for homogeneous, well-developed flow conditions, the symmetrical paths should be measuring the same flow rate.
Therefore, if one of those paths goes into error, we can assume the measurement would have been the same as the other
path and substitute that value.
Therefore, with 2-path error handling turned ON, the following actions result from the various error detection
scenarios.
2-path system (with 2-path error handling ON):
Path 1 error
Path 2 error
Path 1 and Path 2 in error
136
Flowcell
Error Detection Scenario
Symmetrical Paths
Two mid-radius paths
Two diameter paths
Two mid-radius paths
Action
Substitute path 2 measurement, keep
measuring
Substitute path 1 measurement, keep
measuring
Multichannel Error, stop measuring
PanaFlow HT User's Manual