Interface Vs (M/S) Meters-Per-Second; Aeration; Makeup Latch - Siemens SITRANS F Operating Instructions Manual

Section 2

Interface Vs (m/s) meters-per-second

The meter continuously measures liquid sonic velocity (Vs) and tracks changes in this parameter
dynamically. It can compare sonic velocity differences in real-time. Its sonic velocity detection is so
sensitive, it quickly distinguishes between two different liquids flowing through the same pipe. To set
the [Interface Vs m/s] alarm menu cell, select a detection setpoint that falls between the Vs values of
the two liquids. For example, if Liquid "A" has a sonic velocity of 1249 m/s, and Liquid "B" has a sonic
velocity of 767 m/s, then you should enter 1008 m/s for the interface setpoint. The Interface Alarm
becomes active when the measured Vs meets or exceeds the user reference value entered in this
menu cell.
NOTE: The valid Interface Vs range is: 400 to 2100 m/s.
To enter an Interface Vs alarm setpoint:
To activate numeric entry press
Use the numeric keys to type the Interface Vs value in meters-per-second.
To store the data press

Aeration %

The System 1010 surpasses all other transit-time systems in its ability to operate with substantial
aeration (caused by entrained gases, mixing condition or cavitation). Some applications may require
an alarm indication if aeration exceeds a particular level. The meter detects this aeration level and
provides this data as an output. The aeration percentage triggers the alarm relay whenever it meets or
exceeds the threshold you set in this menu cell. The aeration percentage (Vaer %) appears in the
Liquid Data section of the Diagnostic Menu. The digital display screen also shows the current aeration
percentage.
NOTE: Severely aerated conditions may induce meter fault. The 50% default usually allows
enough leeway for continued operation. For intermittent faults, see memory interval in
the Output Control menu.
To set the Aeration % Alarm:
To move the cursor to activate numeric entry press
Use the numeric keys to type the Aeration percentage setpoint.
To store data press

Makeup Latch

A fault condition (caused by an empty pipe or a transient loss of power, etc.) could temporarily interrupt
operation. After recovery from the fault, the meter automatically executes an in-process makeup to
restore operating parameters. During the makeup, the meter sets a Makeup Alarm flag, which clears
upon completion. Therefore, unless you were monitoring the unit continuously, you could miss the fact
that an in-process Makeup occurred and subsequent Totalizer counts were lost. The Makeup Alarm
Latch alerts you that the system implemented a Makeup by holding the Makeup Alarm active until you
reset it manually by the simultaneous keystrokes: <Fn>6 (where "n"represents the measurement chan-
nel). In addition, if the Datalogger is active with Status Alarms selected, generating a Datalogger report
will reset the Makeup Alarm Latch. This ensures that the Alarm does not appear on succeeding Data-
logger reports. A Makeup Alarm appearing on a subsequent report indicates that an In-Process Makeup
must have occurred since the last Datalogger report.
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