Siemens SITRANS F Series Operating Instructions Manual page 115

[HF] Menu Item
The flow meter includes a 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 that automatically compensates for signal beam blowing, thereby extending the
upper flow limit of the flow meter. The HF parameter should only be adjusted in cases where
the user suspects that extreme flow velocity or a large delta-time may be causing signal
correlation problems.
Using the [HF] Menu Cell
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 flow meter to automatically measure the required correction and install the
parameter.
Guidelines for use
● This menu is only accessible for the sensor channel.
● The flow meter will inhibit the "Automatic" installation of the [HF] parameter if the flow rate
● If the flow rate is very high and the flow meter is reporting erroneous or unstable flow,
● The limits of the "HF" parameter are +/- 0.7 and any attempt to manually install a larger
Accessing the [HF] Function
1. At the [Meter Type] Menu, press the <Right Arrow> and then <ENTER>.
2. Press the <Down Arrow> key and scroll to the [Diagnostic Data] menu cell. Press the
FST020 IP65 NEMA 4X
Operating Instructions, 02/2012, A5E03086487-05
is insufficient (too low) to accurately measure the required correction. If the maximum flow
rate for the application is relatively low then this correction is not be required.
then the flow meter 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
flow meter should be able to properly measure the highest flow rates without problems.
value will cause the flow meter to abort the installation of the parameter.
Note
Pressing the <Left Arrow> key at any stage prior to accepting the measured value will
abort the installation and return to the previous setting.
<Right Arrow> key.
Troubleshooting
10.4 Site Setup Data
113