Data Logging Module - Elster gas-lab Q1 Technical Documentation Manual

Functional description

5.2 Data logging module

5.2.1 Function
The gas-net Q1 evaluation computer is always equipped with an integrated data
logging function. The responsible Data logging module, however, provides only
the data logging service. The actual data to be logged is generated by other
modules of the module group.
When parameterising the Data logging module, you only have to define which of
the available archive groups shall actually be logged and which storage depth
shall be applicable. All archives defined in that way are designed as ring
storage. The data logging depth determines how many entries an archive is able
to write at most. If an archive is full, the respective oldest entry will be
overwritten by each new entry.
The following sections list the types of archive groups each gas-net Q1 module
provides:
Gas quality module:
The gas quality module provides 3 archive groups:
The PTB archive logs the billing-relevant data, which consists of the gross
calorific value GCV, CO
The data is recorded every 15 minutes. The PTB archive has a size of 180
days.
The Interval archive logs the gross calorific value GCV, the standard
density Rhon, the CO2 content and the status of the measuring system.
The data is logged at the full hour and when an error occurs. The Interval
archive has a size of about 60 days.
The Quality archive logs 6 quality factors during each 1-point calibration.
These factors provide information on the corrections that have been made
during the individual calibrations with methane. The Quality archive has a
depth of 365 entries.
gas-lab Q1
content and status of the measurement system.
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