DigitalFlow™ GF868 Service Manual (1 and 2-Channel) 25
Chapter 3. Diagnostics
3.3 Diagnostic Record
Upon leaving the Diagnostic Menu via the [EXIT] key or the EXIT option on the option bar, the display screen will
continue to show the last diagnostic parameter that was selected. To return to normal measurement mode, select a
channel to display (for a 2-Channel meter only) and then select the desired display parameter. See Chapter 3,
Operation, of the Startup Guide for detailed instructions.
The values for the diagnostic parameters immediately after initial installation of the meter and verification of proper
operation should be entered in Table 6 on page 39. These values can then be compared to future values to help diagnose
any future malfunction of the system.
3.4 Flowcell Problems
If preliminary troubleshooting with the Error Code Messages and/or the Diagnostic Menu indicates a possible flowcell
problem, proceed with this section. Flowcell problems fall into two categories:
• gas problems
• pipe problems.
Read the following sections carefully to determine if the problem is indeed related to the flowcell. If the instructions in
this section fail to resolve the problem, contact the factory for assistance.
AcVOL Act Vol.
KACF/MIN
Displays actual volumetric flow. N.A. N.A.
StVOL Std Vol. KSCF/MIN Displays standard volumetric flow, if
STANDARD
equation is used.
N.A. N.A.
ToffS* Skan T Offset
usec
Displays dynamically calculated signal timing offset in
skan signal measurement
N.A. N.A.
Tu S* UP Transit S usec Displays Skan Tup. N.A. N.A.
Td S* DN Transit S usec Displays Skan Tdn. N.A. N.A.
DT S* DeltaT S usec Displays Skan DELTA N.A. N.A.
Tu M* UP Transit M usec Displays Measure Tup N.A. N.A.
Td M* DN Transit M
usec
Displays Measure Tdn N.A. N.A.
DT M* DeltaT M usec Displays Measure Delta N.A. N.A.
Vinst Vinst. Ft/s Displays the instantaneous velocity for comparison
with Vel without averaging.
N.A. N.A.
EXIT Last parameter Leave the Diagnostics Menu N.A. N.A.
* These options are available only in the Skan/Measure mode.
Table 3: Available Diagnostic Parameters (cont.)
Option Bar Screen Display Description Good Bad
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