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IP2046/IM
Nov 2006
4.4.12 Setting the damping applied to the output Screen display d
Factory default value 3
The damping value entered is actually a time constant in seconds which is applied as smoothing to the
displayed PV and current output.
A new value may be entered up to a maximum value of 9999 seconds. A large value will have the effect
of smoothing out rapid changes of current output and will also smooth out the effects of turbulence and
ripples on the liquid surface.
Note, it would not normally be necessary to select a value greater than 30 seconds.
Alternatively, a value of zero may be entered in which case no smoothing is applied and changes in
reading immediately change the current output.
Note, as the MSP400 transmits a pulse at nominally once per second, a damping time of zero will not
necessarily give an immediate change in output.
To edit the damping value:
a) Press the blue button → to enter the damping menu and to display the current value in use. If this is
correct, press the green button ↓ return to the main menu.
If the damping value is to be edited, press the blue button → again to allow editing
The leading digit of the current damping 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 the 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 damping value is incorrect, the edit sequence for the 20mA point can be re-started by pressing
the blue button → again.
If the damping value is correct, press the red button ↵ to save the new value to memory and automatically
scroll on to the next main menu option: “AL”
4.4.13 Selecting the output current action on alarm condition
Screen display AL
Factory default value Hold
The MSP400 will signal an alarm condition in the event that the target echo is lost for a period of 900
seconds or more. This time of 900 seconds is factory set and is changeable in the field.
(See Section 4.7.2)
The user can select what action the current output will take in the event of a lost echo condition:
Hi The current on the two wire loop will drive up to 21mA and will remain there until a correct target
echo is recovered. The display will flash “LE” and the alarm action alternately.
Hold The current will freeze at the value it was last reading and will remain there until a correct target
echo is recovered. The display will flash “LE” and the last valid reading alternately.
Lo The current on the two wire loop will drive down to 3.6mA and will remain there until a correct
target echo is recovered. The display will flash “LE” and the alarm action alternately.