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LS-MC
Date of Issue: 19/09
2013
Issue Number: 5.2
© 2012 Sontay Limited. All rights reserved
Settings:
If, however, you wish to set the 4 or 20mA level by ranging the instrument to a known target - perhaps the level in the vessel at this
time - then press the blue button to enter this menu.
The first option is to set the 4mA level. Ensure the target is at the desired 4mA level and, with the display reading the new value, press
the blue button . The display will show the present value for the 4mA setting. Press the blue button again to edit the 4mA level,
and the display will alternately flash “4” with the current level reading.
Press blue button to confirm the correct value for the 4mA level then press red button to save and exit to the 20mA setting menu.
To set the 20mA level, ensure that the target is at the desired 20mA level and, with the display reading the new value, press the blue
button . The display will show the present value for the 20mA setting. Press the blue button again to edit the 20mA level, and the
display will alternately flash “20” with the current level reading.
Press blue button to confirm the correct value for the 20mA level then press red button to save and exit to the "Lrn" menu.
Blocking unwanted echoes from false targets:
The LS-MC has an easy to use “Lrn” (Learn) routine which allows the user to teach the instrument up to 2 false echoes and then ignore
them in future operation.
If the application is straight forward and there are no false echoes, press the green button now to exit the programming menu and
return the instrument to normal operation, showing the level reading on the display.
If, once the LS-MC is in operation, an echo other than the true liquid surface echo is detected, and an incorrect level reading is
displayed, the instrument can be taught to ignore this false echo. This routine may be used at any time, either during or after set-up or
should a problem occur later.
Press blue button to enter the Lrn menu. The display will show “LrnX”, where X is 0,1 or 2 and is the number of false target echoes
already stored. To store a new false echo, press the blue button for greater than 5s.
Note : If there are already 2 false echoes stored (Lrn2) then the LS-MC will not allow the user to store another echo until the memory is
cleared. (see below).
The display will now flash the false target position alternating with "Lrn". After 4s the false target is stored and the display shows
"LrnX". If for any reason this target is not to be saved then press the blue button and the "Lrn" sequence may be repeated or
aborted. Otherwise, press the red button Å to save the false target echo and return to the main menu.
To store another false target echo, navigate down the main menu to "Lrn" and repeat the sequence again.
Note: When a false target echo is stored, the LS-MC effectively sets up a 'window' around the false target and will ignore any echo from
within that window unless the echo from the liquid surface is larger than that from the false target.
The user may therefore see no change in the LS-MC output current whilst the liquid level moves through this window, which is
equivalent to a distance of around 200mm.
To clear the LS-MC of all false echoes stored, simply press blue button to enter the Lrn menu then with the display showing "LrnX"
press the green button for 10s to completely clear the memory. The display will now show "Lrn0".
Changing operation to distance mode:
If the LS-MC is to be used to measure distance rather than level, the display can now be changed accordingly. With the display showing
the level reading, press the blue button , the display will now show the distance to target alternating with "Dist".
Note: The display will continue to alternate between the distance to target and "Dist" whilst in distance mode.
