Emerson 8800A, Product Manual

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2-3
Installation
COMMISSIONING
Commission the Model 8800C before putting it into operation. This
ensures proper configuration and operation of the meter. It also enables
you to check hardware settings, test the flowmeter electronics, verify
flowmeter configuration data, and check output variables. Any
problems can be corrected – or configuration settings changed – before
going out into the installation environment. To commission on the
bench, connect the HART
®
Communicator or Asset Management
Solutions
™
(AMS) software (or other communications device) to the
signal loop in accordance with the specifications for your communicator.
See Appendices C, D, and E for additional information.
GENERAL
CONSIDERATIONS
Before you install a flowmeter in any application, you must consider
flowmeter sizing (the line size) and location. Choose the correct
flowmeter size for an application to increase rangeability and minimize
pressure drop and cavitation. Proper location of the flowmeter can
ensure a clean and accurate signal. Follow the installation instructions
carefully to reduce start-up delays, ease maintenance, and ensure
optimum performance.
Flowmeter Sizing
Correct meter sizing is important for flowmeter performance. The
Model 8800C is capable of processing signals from flow applications
within the limitations described in Appendix A: Reference Data. Full
scale is continuously adjustable within these ranges.
To determine the correct flowmeter size for an application, process
conditions must be within the stated requirements for Reynolds
number and velocity. See Appendix A: Reference Data for sizing data.
Contact your local Rosemount Inc. sales representative to obtain a copy
of the Model 8800C Vortex Flowmeter Sizing Program which calculates
flowmeter sizes based on user-supplied input.
Flowmeter Orientation
Design process piping so the meter body will remain full, with no
entrapped air. Allow enough straight pipe both upstream and
downstream of the meter body to ensure a nonskewed, symmetrical
profile. Install valves downstream of the meter when possible.
Vertical Installation
Vertical installation allows upward process liquid flow and is generally
preferred. Upward flow ensures that the meter body always remains
full and that any solids in the fluid are evenly distributed.
The vortex meter can be mounted in the vertical down position when
measuring gas or steam flows. This type of application should be
strongly discouraged for liquid flows, although it can be done with
proper piping design.
NOTE
To ensure that the meter body remains full, avoid downward vertical
liquid flows where back pressure is inadequate.