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Reference Manual
IP2013, Rev BA
February 2012
4-5
Mobrey MSP422
First Measurements With the transmitter installed and display units selected, the display will show
what the instrument calculates as the liquid depth (level). This value is
calculated by the microprocessor as being the difference between the
distance-to-target being measured and the default value for the datum or
bottom reference (b.rEF).
Figure 4-2. Bottom Reference
Before changing any of the default values, press the blue button
to change
the PV display to indicate distance-to-target, as measured by the transmitter
from the transmitter face. This value is shown alternately with the text “diSt”
to indicate the display is in distance mode. The calculation can be checked
against a manual measurement if required.
NOTE:
A useful feature at this stage is that the transmitter can be used as an
electronic tape measure. With an empty tank or vessel, the transmitter will
read the distance to the bottom of the tank. This distance can be noted and
later used when setting b.rEF.
Press the blue button
again to get to the echo size. This is a scale of 0 to
100. (It is possible to record a value greater than 100). With the display in this
mode, the central “:” cursor will flash once for every echo received, which
under normal circumstances will be once per second.
NOTE:
It is useful at this point to check that the maximum echo size available is being
received. Adjust the position of the instrument until the highest echo size is
continually shown. In most applications, the signal strength will vary over a
wide range: 20 to 80.
Press the blue button
again to return to the original level reading and start
the calibration routine.
NOTE:
The output of the transmitter will vary during programming, as the various
default values are changed. The display will automatically revert to the level
or distance reading from any other display after a period of four minutes.
Distance-to-target
Depth (Level)
Bottom Reference