Temperature Alarms (High Td, Ts And Low Td, Ts); Aeration; Makeup Latch - Siemens SITRANS F Instruction Manual

Section 2

Temperature Alarms (High Td, Ts and Low Td, Ts)

The FUE1010EN thermal energy meter provides 4 alarm set points which will help you monitor and
diagnose temperature limits. The meter executes dynamic tracking of the temperature difference (Td)
between the supply and return lines as well as the absolute value of the supply temperature. You can set
the alarm relay to (fail-safe) trip when the temperature difference or supply temperature moves outside
the band defined by the Max and Min Td or Tr setpoints.
Interface Vs (m/s)
The [Interface Vs m/s] menu cell sets the Interface Vs alarm relay setpoint. Relay changes state when
variable exceeds users setpoint.

Aeration %

The FUE1010EN surpasses all other transit-time systems in its ability to operate with substantial aera-
tion (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 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. The Makeup Alarm Latch alerts you that the system implemented a Makeup by hold-
ing the Makeup Alarm active until you reset it manually using the simultaneous keystrokes: <Fn>6
(where "n" represents the measurement channel). 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 appearon succeeding Datalogger reports. A Makeup Alarm appearing on a subse-
quent report indicates that an In-Process Makeup must have occurred since the last Datalogger report.
ENT
2-50
1010ENFM-3B