Introduction To [Hf] Menu Item; Using The [Hf] Menu Item - Siemens SITRANS F Operating Instructions Manual

Section 2

Introduction to [HF] Menu Item

All 1010 flowmeters with version 3.01.02 and later operating systems include a new Diagnostics Menu
item that permits the entry of a flow registration correction parameter labeled [HF]. This "HF" parameter
is the input for a proprietary algorithm which automatically compensates for signal beam blowing in
pipes utilizing either 1011 clamp-on or insert transducers, thereby extending the upper flow limit of all
1010 flowmeters. This algorithm provides the most benefit for clamp-on gas meters where high flow
velocities and low sound velocities create the most challenging conditions for digital signal processing
routines.

Using the [HF] Menu Item

Two methods for adjusting this parameter are provided via the [HF] menu cell, located within the
"Diagnostics / Site Setup" submenu. The "Manual" method provides direct entry of this parameter and
is primarily intended for the advanced user, whereas the "Automatic" method allows the 1010 flowmeter
to automatically measure the required correction and install the parameter.
Guidelines for using the [HF] menu item are described below:
This menu is only accessible for the transducer channels, not the virtual (average flow) channel
of the flowmeter. (i.e., Diagnostics Path 1 or Path 2, but not Path 1 & 2).
The 1010 flowmeter will inhibit the "Automatic" installation of the [HF] parameter if the flow rate
is insufficient (too low) to accurately measure the required correction. If the maximum flow
rate for the application is relatively low then this correction should not be required.
If the flow rate is very high and the flowmeter is reporting erroneous or unstable flow, then the
flowmeter may already be having trouble resolving the upstream and downstream signals. In
this event, it may be necessary to first lower the flow rate to a moderate level before performing
the "Automatic" HF adjustment. Once this is done the flowmeter should be able to properly
measure the highest flow rates without problems.
The limits of the "HF" parameter are +/- 0.7 and any attempt to manually install a larger value
will cause the flowmeter to abort the installation of the parameter.
NOTE: Pressing the <Left Arrow> at any stage prior to accepting the measured value will
abort the installation and return to the previous setting.
To access this [HF] menu item proceed as follows:
At the [Meter Type] Menu, press the <Right Arrow> and then <ENT> to select the desired Path
(e.g., Dual Path Flow).
In the [Dual Path Flow] Menu, press the <Down Arrow> and scroll to the [Diagnostic Data]
menu cell. Press the <Right Arrow> to select it.
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