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IP2046/IM
Nov 2006
4.7.2 Setting the Lost Echo Time Screen display “LE”
Factory default value 900
The lost echo time is the time in seconds which the MSP400 will wait before taking the lost echo action
as described in 4.4.13.
A new value may be entered in the range 0 to 9999. It is recommended that the lost echo time be left at
900 seconds to avoid false trips and alarms due to temporary loss of echo due to transient poor surface
conditions. A shorter lost echo time should only be programmed if it is imperative that action be taken in
a shorter timeframe.
To edit the lost echo time:
a) Press the blue button → to enter the lost echo time menu and to display the current value in use. If
this is correct, press the red button ↵ return to the main menu.
If the lost echo time is to be edited, press the blue button → again to allow editing
The leading digit of the lost echo time value will now be flashing, indicating it may be changed.
b) Use the green button ↓ to edit the value of the leading digit.
c) Once correct, use the blue button → to select the next digit and then the green button ↓ to edit as
before, or the blue button → to move to the next digit. Continue this sequence until all 4 digits are
correct.
d) Press the blue button → a final time to confirm the new value. None of the digits should now be
flashing.
If the new lost echo time is incorrect, the edit sequence can be re-started by pressing the blue button →
again.
If the lost echo time is correct, press the red button ↵ to save the new value to memory and automatically
scroll on to the next main menu option: “dEAd”
4.7.3 Setting the Dead Band Screen display “dEAd”
Factory default value:
MSP400RH-B28 0.45 (m)
MSP400RH-N28 1.5 (ft)
or 18 (in)
The dead band is the region below the MSP400 transmit face in which no measurements can be made.
This is also sometimes known as the Blanking or Blocking zone, and is a feature of all Ultrasonic level
transmitters, with a value dependant upon certain intrinsic properties of the transmitter itself.
The user should never reduce the dead band below the factory default minimum value unless advised to
do so by the manufacturer.
A larger value may be entered to elimate echo processing of echoes from false targets.
Note however, that any real echos in the dead band will also now be ignored.