Fug1010Gcn Application Notes; To Obtain Technical Assistance; Overview Of System Performance; Accuracy - Siemens SITRANS FUG1010 IP65 NEMA 4X Instruction Manual

Section 6
6.

FUG1010GCN APPLICATION NOTES

FUG1010GCN is an extremely versatile transit-time flowmeter that operates on fluids (with non-intru-
sive clamp-on transducers) as well as low or high pressure gases. Please review to the following appli-
cation guidelines to obtain the best service from this equipment.
FUG1010GCN provides a simple menu-driven interface for site programming. During the installation
procedure, you tell the system what you need it to do. The flowmeter's response is to verify the pipe and
fluid conditions, and based on your selections, optimize operation automatically. However, the system
cannot protect itself from a critical data entry error. Therefore, satisfactory performance depends also on
the accuracy of the information that you provide.
For normal operation, the flowmeter only needs a receive signal of sufficient amplitude to activate its
automatic gain controlled detection circuits. In almost all cases, adverse application conditions reduce
system performance, or cause apparent operational failures. Finding the culprit application condition
usually reveals an appropriate remedy.
6.1

TO OBTAIN TECHNICAL ASSISTANCE

The meter's computer provides comprehensive diagnostics data. Using this data, our engineers can
analyze the system in relation to the application. Proper analysis will provide solutions to virtually any
application problem. For technical assistance, please contact your local Siemens representative for
expert help (www.siemens.com).
NOTE: Only install transducer pairs with matching serial numbers.
6.2

OVERVIEW OF SYSTEM PERFORMANCE

We base our system performance specifications on acceptable fluid sonic conductivity and other perti-
nent application conditions. Obviously, the diversity that characterizes fluid flow, makes it impractical for
us to cover all possible application conditions that have the potential to reduce performance.
However, performance within specifications depends primarily on the receive signal's signal-to-noise
ratio and amplitude. The information presented below may point to application conditions that could
reduce system performance below its normally high level.

6.2.1 ACCURACY

Be aware that although system accuracy is exceptional over a wide turndown ratio, at extremely low
flow rates, a small zero offset becomes a high percentage of actual flow. Obviously, the ultimate accu-
racy will be obtained by performing an on-site flow calibration. A flow calibration can increase system
accuracy to between 0.30% to 0.5%, depending on application conditions.
Two common data-entry mistakes may reduce performance. If you enter an incorrect fluid viscosity
value, you could compromise the intrinsic flow profile compensation curve. In addition, you could reduce
accuracy by incorrectly identifying the transducers. Measured sonic velocity (Vs) errors usually reveal
this problem. This can be resolved by simply returning to the appropriate menu cells, entering the correct
values, then repeating the transducer installation.
6-1
1010GCNFM-3C