Siemens SITRANS FUS1020, Manual, Page: 201 / 251

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1020NFM-1D Section 7
Invalid Setup • In Reflect Mode, the flow computer detects that the pipe wall signal may
infringe upon the liquid signal. Use Direct Mode instead.
Press <ENTER>, <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 - 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.
• A large air bubble needs to be “flushed out.”
• 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 <EN-
TER> to resume the installation procedure. Otherwise, press the <LEFT
Arrow> to abort the installation and conduct a thorough investigation.
Detection Fault 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, 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.
(use Direct Mount)
NOTE: If you receive a Detection Fault message, it is strongly recommended that the Tech-
nical Service Department be contacted for further orientation.
Press [ENTER]
MESSAGE DESCRIPTION