Using The "F4" Reset Sequence - Siemens SITRANS F Instruction Manual

Section 2
MESSAGE
Low Signal Press [ENT]
Detection Fault
NOTE: If you receive a Detection Fault message, it is strongly recommended that you contact
Technical Service for further orientation.

Using the "F4" Reset Sequence

You may encounter an operating problem that blocks access to the Diagnostics Menu, or the flowmeter
may operate erratically after exposure to a power transient or some other traumatic event. These cases
may require use of the F4-reset sequence to restore operation.
The F4-reset sequence operates on two levels. The first F4-reset deletes all the data currently in Active
Memory, but leaves Datalogger data and all stored Site Setups intact. This is the most desirable method
since all you have to do to restore operation is reload a saved Site Setup. If this fails then you have to
resort to the second level of the F4 sequence, which allows you to clear ALL Dynamic Memory. Be aware
that this erases all saved Site Setups (including flow calibrated sites), Datalogger Data and user-
defined pipe and transducer tables. This will require you to completely re-install the system and repeat all
desired default settings, custom pipe tables, etc. The chart below shows the sequence of the [F4] rou-
tine:
[Power On/Off + F4]
During the Initial Makeup, the meter decides that the level of the receive
signal is insufficient for proper operation. Some reasons for low signal are:
• Invoking [Install Completed?] on an empty pipe.
• Coupling compound insufficient, not applied, or evaporated.
• A disconnected or broken transducer cable.
• You need to condition the pipe at the mounting location.
• Flush out Large air bubbles.
• The Xdcr cables are defective or not connected to the correct channel.
• The Set Empty routine performed when pipe was NOT actually empty.
If you locate and correct the improper condition immediately, press <ENT>
to resume the installation procedure. Otherwise, press the <LEFT Arrow> to
abort the installation and conduct a thorough investigation.
If it appears that the meter cannot complete an Initial Makeup. It means that
the pipe and/or liquid conditions do not permit a receive signal that meets
the flow detection standards. The system will not be able to operate. Attempt
to improve operating conditions by reinstalling the transducers at a different
spacing offset, or even at a different location on the pipe. In addition, switch-
ing from Reflect to Direct Mount may solve the problem. However, operation
may not be possible if there is poor liquid or pipe wall sonic conductivity or
extreme liquid aeration.
[Clr Active Memory?]
DESCRIPTION
[Clr Saved Data?]
2-83
1010ENFM-3B
No
Yes
No
Yes