OMNI 4000/7000 Operations and Maintenance Guide
– Rev F
1-6
The OMNI 4000/7000 Series
1.5
Equipment Overview
OMNI 4000s and 7000s are microprocessor-based flow computers that perform liquid and gas
flow calculations in accordance with the methods listed in Section 1.4 Calculations.
The flow computer connects to field transmitters in single and multiple Meter Run applications
to monitor:
•
Liquid and gas flow measurements in the pipeline.
•
Custody transfer applications.
The flow computer calculates flow values and displays additional data and measurement
information. This data and information can be transmitted over communication channels and
printed, as needed.
In addition, audit trail logs are available for registering changes to measurement parameters and
firmware updates. The audit trail can be printed directly from the front panel of the flow computer
or viewed with the OMNICONNECT software when connected to a computer.
All input/output (I/O) modules are quality tested and temperature trimmed to optimize analog
inputs before the flow computer is shipped. A label containing information such as the system
serial number and model number is located on the inner chassis or on the outer cover in the case
of the panel mount configuration.
On-site, OMNI 4000/7000 flow computers are configurable, but the firmware code is not user
programmable. We do this to prevent the modification of WELMEC-approved metrologically
relevant areas of the software code. If firmware modifications were allowed, they would render an
existing EC-evaluation certification invalid.
With an OMNI flow computer, the factory-programmed software does not need modification in the
field. This preserves the integrity of existing certifications and provides assurance that software
and firmware have been validated and cannot be modified.
