3410 Series Gas Ultrasonic Meters Operations Manual
Section 5: Calibrate and configure the meter
3-9000-777 Rev E
January 2018
GC data validity
79
5.11.4
GC data validity
The GC-read gas property data validity is indicated by the
AreGasPropertiesInvalidGC
data point.
The data is considered invalid if any of the conditions listed in
Table 5-15
is true. These
conditions are indicated by the Daniel MeterLink
Monitor
page
Field I/O
indicator.
5.11.5
GC alarm handling
The following data points are included in the meter’s alarm log (
see Section 6.2
):
AreGasProper-
tiesInvalidGC
,
IsGCAlarmPresent
,
IsGCCommErr
,
GCCommStatus
, and
IsGCDataErr
.
15
GC does not support the requested message data type.
16
GC does not support the requested data protocol.
17
The meter's Modbus request message (RTU protocol) is too long (exceeds the
maximum allowable length).
18
GC response not received within the communication timeout.
19
GC response message (ASCII protocol) incomplete.
20
GC response message (RTU protocol) incomplete.
21
GC gas property data spans more than one update.
Table 5-15 GC-read gas property invalid conditions
Indication Data Point
Condition
IsGCAlarmPresent
Invalid GC feature key (
see Section 3.1.2
).
Port improperly configured (such as if configured without using the Daniel MeterLink
Field
Setup Wizard
).
Unrecognized gas component ID.
Specified gas stream (
GCStreamNumber
) not found within the specified period
(
GCDesiredStreamTimeout
).
GC reported alarm (GC Alarm1 bits 14 and/or 15 set, GC Alarm2 bits 0, 1, 2, and/or 3 set).
IsGCWarningPresent
Not presently used - reserved for future use.
IsGCCommErr
Refer to communication error conditions listed in
Table 5-14
.
IsGCDataErr
The total unnormalized gas composition mole percentage is not within [85%, 115%].
An individual gas composition mole percentage is not within [0%, 100%].
The specific gravity is not within [0.2, 0.8].
The heating value is greater than 50 kJ/dm
3
.
Table 5-14 GC Communication status list
GCComm status
value
Error description
