Page 9 of 10
LS-MC
Date of Issue: 19/09/2013
Issue Number: 5.2
Tel:
+44 (0) 1732 861200 -
E-mail:
Web:
www.sontay.com
© 2012 Sontay Limited. All rights reserved
Settings:
Power Failure:
All parameters are held in E² PROM memory, so in the event of a power failure or disconnection from the power supply the LS-MC will
remember all of its last parameter values and will resume correct operation once power is restored.
Final Checks:
Check the display is reading correctly.
You may wish to check echo size again before re-fitting the enclosure lid.
Check that the cover seal is in place in the cover and is good condition. It should not be twisted or kinked in any way.
Carefully set the cover on the LS-MC with the text on the cover label at right angles to the conduit entry, and tighten the three
cover screws equally to seal the instrument.
Check that the cable gland is securely tightened and sealing on the cable sheath.
No display:
Check power supply. Ensure a minimum of 12v dc at the instrument terminals. Check cable insulation is not preventing contact at the
terminal block.
No level reading:
Check instrument is pulsing. You should be able to hear the transducer “ticking” about once per second. If there is no sound, the
instrument should be replaced.
Error messages:
Flashing “LE” with “0000”. This means that the LS-MC is not receiving a return echo possibly because the liquid surface is poor or
beyond the range (8m/26ft) of the instrument.
Re-locate the instrument.
Error messages (continued):
Flashing “LE” with a level reading. This means that the LS-MC is no longer receiving satisfactory echoes from the liquid surface. This may
be because of one of a variety of reasons, excessive foaming, turbulence or ullage vapours.
First, check that the instrument transmit face is free from contamination and condensation. The LS-MC will operate with some
condensation on the face, but excessive condensation may cause operational problems. The vessel should be adequately vented to
prevent condensation forming.
Check the instrument is still vertically aligned above the liquid surface, then check the echo received size. If the echo size is small (<3),
re-locate the transducer or modify the vessel so that the LS-MC can operate above a more acceptable area of the liquid surface.
Lost echo (LE) will not be signalled until there has been no return echo for a 10 second period. Within the 10 seconds, the output will
remain fixed. If the 10 seconds elapses and no satisfactory has been received, the output will drive to the current level selected and the
display will flash the last valid level reading alternately with “LE”.
If, however, a satisfactory echo is received within the 10 seconds, a new output is established and the LE timer is re-set.
Fault Finding & Error Messages:
