Siemens SITRANS F FUH1010 Series Operating Instructions Manual page 15

1010FMA-58
Manual Addendum
Digital Damping Procedure Update for Gas & Liquid Flowmeters
INTRODUCTION
The following Digital Damping procedure updates are for SITRANS F gas and liquid clamp-on
flowmeters.Replace the Digital Damping Control: (Hot Key 1 and 2) procedure in the "Detection Modes"
section (sub-paragraph: Command Modes) in the appropriate gas and liquid STIRANS F flowmeter
manuals.
FUG1010 Gas Clamp-on Flowmeter Manuals
Digital Damping Control: (Hot Key 1 and 2)
The FUG1010 permits user modification of the digital averaging used by the signal processing routines.
In general, the default damping values selected by the FUG1010 will provide optimal performance over
a wide range of transit time applications. However, in extreme cases of unstable flow, pulsating flow,
low signal levels or high electronic noise it may be necessary to override these default settings to
permit uninterrupted and reliable flow measurement.
Test Facilities Graph Screen
The FUG1010 Graph Screen includes the capability to access a set of command codes, which enable
a user to override a number of default meter settings. The most important parameter is the digital
damping control, which can be accessed by pressing number <1> or <2> on the keypad while in the
Signal Graph Screen mode.
[MinDamp] Command
Pressing the <1> key will cause [MinDamp #] to appear on the command line at the lower left-hand
corner of the screen. The number listed to the right of the command code represents the exponent in
the FUG1010 exponential averaging routine, where the larger the number the greater the digital averaging.
Pressing the <+> key will increase the damping value. Likewise, pressing the <-> key will decrease
the damping value. To exit this mode, press the <0> key on the keypad.
[MaxDamp] Command
Pressing the <2> key will bring up the [MaxDamp] command. The function of this parameter is similar
to the [MinDamp] command described above; however, the two parameters interact in the following
manner. The MinDamp value must not exceed the MaxDamp value, therefore increasing the MinDamp
value above the previous MaxDamp value will set both parameters to the same value. In most cases,
it is preferred that both damping parameters be set to the same value, however, in cases where rapid
response to changes in gas sound velocity for flow rate is required, the two values may be set differently.
In this situation the meter will use the MaxDamp value when conditions are stable, but then switch to
a faster damping value (limited by MinDamp) when a significant change in sound velocity or flow rate
is perceived. To exit this mode, press the <0> key on the keypad.
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