YOKOGAWA Exaxt450, Руководство пользователя

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IM 12D08N05-01E
4-1
<4. OPERATION>
4. OPERATION
4.1 Main display functions
Go to trend screen
Go to zoom screen
Go to status screen
Go to maintenance screen
25.0
16.64
+
Tag :EXAxt SC450
200.0
μS/cm
Figure 4.1 Main Display
A heart “ ” mark is lit on the right-upper corner of the screen when HART communication
is active. An “Χ” mark is lit when HART communication is abnormal.
Nothing appears when HART communication is not used.
Note that the “Χ” mark may appear due to output signal noise or the like even when HART
communication is not used. There is no problem when HART communication is not used.
Continue operation while ignoring the mark.
4.2 Trending graphics
Pressing the button changes the display into a graphical mode in which the average
measured value is shown on a time scale. The “Live” value is also digitally displayed in
a text box. The time scale ( X-axis) and the primary value scale (Y-axis) are set in the
“DISPLAY SETUP” menu. The full screen displays a trend of 51 points that represent the
average of the selected time interval. The converter samples the measurement every
second. The trending graphic also shows the maximum and minimum measured value in
that interval.
For example if the time scale is set to 4 hours, then the trend is shown for 4 hours prior
to the actual measurement. Each point on the trend line represents the average over
4*60*60/51 = 282 measurements (seconds).
Maximum
Minimum
Minimum
Maximum
Average
Live reading
SC
SC
T
120.0
90.0
60.0
30.0
109.3 µS/cm
450
Figure 4.2 Trend screen