Panametrics DigitalFlow GM868, Service Manual

Page: 35 / 72

DigitalFlow™ GM868 Service Manual 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 41
. These values can then be compared to future values to help
diagnose any future malfunction of the system.
TEMP Temperature deg
F
Displays the gas temperature
(4-20 mA input).
N.A. N.A.
PRES Pressure psia Displays the gas pressure
(4-20 mA input).
N.A. N.A.
Mw Molecular Wt. Displays the average molecular weight
of the gas.
N.A. N.A.
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.
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.
ToffS* Skan T Offset usec Displays dynamically calculated signal
timing offset in skan signal
measurement
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(Continued)
Option Bar Screen Display Description Good Bad