User's Manual

2-79
1010NFM-3J
Section 2
NOTE: If you receive a Detection Fault message, it is strongly recommended that you con-
tact 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 meter
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 on the next page shows the
sequence of the [F4] routine.
• In Reflect Mode, the flow computer detects that the pipe wall signal may
infringe upon the liquid signal. Use Direct Mode instead.
Press <ENT>, <UP Arrow>, <DOWN Arrow>, or <LEFT Arrow> to abort
install routine. Continue programming other site data in anticipation of re-
solving the difficulty later. Call technical support for help if necessary.
Low Signal - Press 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.
Detection Mode 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.
Appears if 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, switching 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.
MESSAGE DESCRIPTION
[ENT]