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2104349 rev. AD Page 1
–5
Choosing a log period of less than 60 minutes will result in additional records
being logged. As a result, this requires more storage space to hold a full day’s
data. The log period must never be less than the volume calculation period.
1.1.4.2
Volume calculation period entries
Volume calculation period entries are made every second, by default. The user
may change this period up to 60 minutes. API 21.1 strongly suggests a volume
calculation period (QCP) of once per second.
The volume calculation period should never be greater than the log period and
should be evenly divisible into the log period.
Volume calculations are completed, following the top of the current period (i.e., top
of the hour, top of the minute, each second).
Display function
During operation, the front panel LCD continuously scrolls through the operating
parameters. Table 1
–2 shows the typical displayed parameters; however, many
parameters with a register address can be displayed. The duration that the
parameter is displayed can vary from 1 to 255 seconds (default is five seconds); a
setting of zero seconds will set any item to Off. See the Program Display section
and the PCCU32 Help Files for additional information.
Table 1
–2 Typical G4 EX display options
Display Description
DATE/TIME MM/DD/YY
HH:MM:SS
Current date and time, 24 hour clock
YEST DP LOW NN PERCENT
Yesterday’s % time below DP Low Set Point
YEST DP HIGH NN PERCENT
Yesterday’s % time below DP High Set Point
FLOW RATE NNNNNN.N SCF/HR Current flow rate, programmable SCF, MCF or MMCF
TOTAL ACCUM VOL NNNNNN.NN MCF
Total accumulated volume, programmable SCF, MCF
or MMCF
DIFF PRESS NNN.N IN. H2O Differential pressure, inches H2O
PRESSURE NNN.N PSIA Static pressure absolute, PSIA
FLOW TEMP NN.N DEG. F Flowing temperature, °F
YEST VOL NNNN.N MCF
Yesterday’s volume, programmable SCF, MCF or
MMCF
PERIOD VOL NNNN.N SCF Last volume calculation period volume
BATTERY VOLTAGE NN.N VOLTS Battery voltage as supplied by external unit
M_FLOWRATE NNNNNN.N SCF/HR Minute average flow rate
STATION ID ID of unit
ORIFICE DIAMETER N.NNNN INCHES Size of orifice plate
1.1.6 Display annunciators
Since a primary function of the G4 EX is to provide complete volume and
operational records, it is important to indicate unusual or alarm conditions as they
occur. This is supported on the LCD in the Annunciator display area shown in
Figure 1
–2.