Siemens SITRANS FUH1010PVDX, Руководство по эксплуатации, Страница: 188 / 308

6-4
CQO:1010PVXFM-3 Section 6
Vs m/s
This menu cell shows the current sonic velocity in meters per second (m/s). If you move the cursor to this
menu cell you will note that it switches from the usual arrow (
→
) to a question mark (?). This indicates
that you can increase the reading by pressing the [+] plus or [1] key; or reduce the reading by pressing
the [-] minus or [2] key.
(When using the magnetic wand, touch the ENTER sensor to increase the
reading; touch the <Right Arrow> sensor to decrease the reading.) The pipe diameter and trans-
mission frequency determines the effective increase or decrease per key press. Sonic velocity (Vs)
adjustment is a diagnostic tool intended for our technicians or experienced users only. Improper use will
affect the meter accuracy.
HiFlow and LoFlow
The [HiFlow] and [LoFlow] menu cells allow you to enter maximum and minimum expected flow rates
based on current operating conditions. Under normal circumstances, you should never need to change
these settings. It is possible however, that a Controlotron customer service engineer may ask you to edit
these settings during a support session. In such a case, a <Right Arrow> at the menu cell enables
numeric entry.
Important Note: A caution on the use of upper and lower flow limits (used to prevent flow mis-
registration) prior to using the Reversal Zero technique (Reversamatic): If the negative flow rate
that the meter reads in the step during which the transducers are reversed is more negative than
the lower flow limit, the meter will re-register positive and the Reversal Zero cycle will thus be
corrupted.
Therefore, postpone the installation of upper and lower flow limits until the reversal zero proce-
dure is executed successfully. For pipes that combine large diameters with very high flow veloci-
ties, it may be necessary to move the upper and lower flow limits out of the way until the reversal
zero is completed. Moreover, pipes of this size frequently have excellent intrinsic zero perfor-
mance and may not even need zeroing.
AnCal
This menu cell allows you to enter an artificial flow rate in current rate units that will drive the meter’s
analog outputs, totalizer output and the screen shown below. You can use [AnCal] to check the analog
outputs or as a reference source for calibrating external devices such as remote display screens or chart
recorders and RTU’s. To test the Totalizer function, leave [AnCal] active for enough time for an accumula-
tion to appear on the screen below. Moving the cursor from the menu cell cancels the [AnCal] function.
AnCal Flow Rate Simulator for calibrating external devices, etc. Highlight this item
then press <Right Arrow> to enable numeric entry. Type desired simulated
flow rate. Be aware of the units prefix (K, M, etc.).
NOTE: AnCal remains
active only while you remain in this menu cell.
HiFlow Most positive expected flow rate for application (adjustable).
GAL/MIN
LoFlow Most negative expected flow rate for application (adjustable).
GAL/MIN
FLOW DATA MENU ITEMS (continued)