Memory/Fault Set; Memory Delay (Sec); Reflexor Zero/Fault Set (Reflexor Mode Only) - Siemens SITRANS F Operating Instructions Manual

Section 2

2.5.3 MEMORY/FAULT SET

Certain situations (e.g., an empty pipe or excessive aeration) will interrupt data production. Use Memory/
Fault Set to select the meter response to such an interruption. The Fault setting (default) will zero the
flow rate output and declare an alarm on a flow display screen, Datalogger report and an assigned
relay output.
For some applications, however, occasional temporary Fault conditions may be a normal part of the
process and would not require an alarm response. The system offers a Memory operating mode to
support such an application. Memory Mode suspends the system's Fault response by preventing the
flow outputs from dropping to zero for the interval specified in the Memory Delay menu cell. During the
Memory duration, the meter will maintain the last valid flow reading measured before the onset of the
fault condition. The default Memory Delay is 60 seconds. You may select any duration from 3 to 604,800
seconds (one week).
To select Memory Mode:
To access the [Memory/Fault Set] option list press
Move the cursor down to [Memory] press
To make selection press
This moves the highlight to Memory Delay (sec).

Memory Delay (sec)

Selecting [Memory] activates the suppressed Memory Delay menu cell. It allows you to specify the
number of seconds that the meter maintains its last valid flow reading. When the memory delay ex-
pires, it triggers the fault alarm response described previously.
To specify the Memory delay:
To enable numeric entry press
Use the numeric keys to type the delay in seconds.
To register the new value press
2.5.4 REFLEXOR ZERO/FAULT SET OPTION (Reflexor Mode only)
NOTE: The [Zero/Fault Set] menu option only appears on the display if the selected Channel
is the Reflexor mode.
The System 1010 Reflexor declares a Fault when the receive signal drops below the Doppler detection
threshold. To change the Reflexor response to a Zero Flow indication rather than a Fault, select [Zero]
in the [Zero/Fault Set] menu option. Note the following:
a. FAULT – When selected the system will declare the Reflexor channel to be in Fault and the
flowmeter will indicate "F" on the display screen. Note that when a new Reflexor channel is created
the [Fault] option is the default mode. Also note that the sum (or difference) channel will also be
declared to be in Fault.
b. ZERO – When selected the Reflexor channel will be declared to be at Zero Flow instead of in
Fault and the flowmeter will indicate 0.00 on the display screen.
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