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Service Manual
Third edition, June 1997
3.25 Level Unit – TX Service
The test functions for TX simulation and LCS simulation can
be used if a tank has the TX Failure check box marked.
When setting the signal source to TX Simulation, a tank
signal will be sent from the Transmitter to the Level Unit.
The LCS Simulation generates a signal from within the Level
Unit.
The simulation signal represents a “Distance” about half the
B-distance if TX Type and Specific Inner Length are set to
zero and the Pipe and Vapor Correction are not used. Note
that the simulated “Distance” is not precisely defined.
If both TX- and LCS Simulations give a “distance”, but the
TX Failure check box is still marked, the reason for fault can
be:
• hardware fault in the Transmitter’s Electronic Box,
• dirty, damaged or misaligned antenna,
• the Electronic Box is not correctly mounted on the
antenna feeder or
• there are no echoes to find within the defined range.
If only LCS-Simulation produces a “distance”, the reason for
fault may be:
• a hardware fault in the Transmitter’s Electronic Box or
in a Transmitter Interface (LI) or
• faulty cabling between Transmitter - Transmitter Inter-
face - LCS Board.