Siemens SITRANS 7ME3500, Руководство по эксплуатации, Страница: 165 / 296

Troubleshooting
10.4 Site Setup Data
FUE1010 IP65 NEMA 4X
Operating Instructions, 12/2014, A5E03086491-AC
163
[HF] Menu Item
The flow meter includes a Diagnostics Menu item that permits the entry of a flow registration
correction parameter labelled [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 channels, not the virtual (average flow)
channel of the flow meter (i.e., Diagnostics Path 1 or Path 2, but not Path 1 & 2).
● The flow meter 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 is not be required.
● If the flow rate is very high and the flow meter is reporting erroneous or unstable flow,
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.
● The limits of the "HF" parameter are +/- 0.7 and any attempt to manually install a larger
value will cause the flow meter 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.
Accessing the [HF] Function
1. At the [Meter Type] Menu, press the <Right Arrow> and then <ENTER> to select the
desired Path (e.g., Dual Path Flow).
2. 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.
3. In the [Diagnostic Data] Menu, highlight [Path Select] and select the desired sensor path.
Press <ENTER> to select path.
4. Press the <Down Arrow> and scroll to the [Site Setup Data] menu cell. Press the <Right
Arrow> to select it.