Siemens SITRANS FUP1010, Руководство по эксплуатации, Страница: 131 / 208

Table 10-4 Site Setup Menu Items
fx Drive Current Transmit drive code selected during Initial
Makeup. The drive code controls the sonic
transmit signal.
N (burst length) Transmit burst duration selected during Initial
Makeup. To change N count press <Right Arrow>.
At equal sign enter numeric value (1 to 9 only).
Ltn (mm/in) Spacing distance between the transducers. It will
be in inches or millimeters, depending on default
units.
Vf max The flow velocity (in selected units) corresponding
to one whole cycle offset between upstream and
downstream receive signals.
Vs max M/S Maximum Vs for current transducer spacing.
Vs min M/S Minimum Vs for current transducer spacing.
Empty Value of Empty Alarm Setting. The meter will
declare an empty status if signal strength drops
below this value.
Samples/Cycle Digital sampling rate.
Max Damping Maximum signal damping. Use to average digital
data when an unstable condition occurs.
Min Damping Minimum signal damping. Use to average digital
data when an unstable condition occurs.
HF Flow registration correction parameter.
[HF] Menu Item
The flowmeter 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 flowmeter. 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 flowmeter 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 flowmeter (i.e., Diagnostics Path 1 or Path 2, but not Path 1 & 2).
● The 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 is not be required.
Troubleshooting
10.4 Site Setup Data
FUP1010 IP67 Portable Flowmeter
Operating Instructions, 02/2010, A5E02951522A Revision 01 129