Emerson MSP422 User Manual

Page of 40
Reference Manual 
IP2013, Rev BA 
February 2012
4-11
Mobrey MSP422
f)
Press the red button 
 to save this false echo and exit to the menu.
However, if this false echo shouldn't be saved, press the blue button 

to 
exit to the menu.
g) To store another false target echo, re-start from step (b).
h) Press the green button 

to exit the menu and return to the PV display.
NOTE:
If there are two false echoes stored (“Lrn2”), the transmitter will not allow 
another echo to be stored until the memory is cleared (see next procedure.)
NOTE:
When a false echo is stored, the transmitter sets up a 'window' around the 
false target and ignores any echo from that window, unless the echo received 
from the liquid surface is larger than the stored false echo. There may be no 
change in the transmitter output current while the liquid level moves through 
this window, which is equivalent to a distance of 8 in. (20 cm).
NOTE:
See Figure 4-1 on page 4-3 for a map of the programming menu structure and 
how to access all the menu options.
To clear all the stored false echoes:
a) If entering the menu system from the PV display, press the green button 
 
repeatedly until the “Lrn” menu option is indicated (see above note.)
b) Press the blue button 
 to enter the “Lrn” menu.
c) With the display indicating “LrnX”, press and hold the green button 
 for 
ten seconds to clear the memory. The display then indicates “Lrn0”.
d) Press the red button 

to exit to the menu.
e) Press the green button 

to exit the menu system and change to the
PV display.
FINAL CHECKS
Final checks:
a) Check the display is reading correctly.
b) You may wish to check echo size again before re-fitting the enclosure lid.
c) 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.
d) Carefully set the cover on the transmitter, and tighten the three cover 
screws equally to seal the instrument.
e) Check that the cable gland is securely tightened and check sealing on the 
cable sheath.
POWER FAILURE
All parameters are held in EPROM memory. In the event of a power failure, or 
disconnection from the power supply, the transmitter will remember all of it's 
last parameter values and will resume correct operation once power is 
restored.