Reference Manual
00809-0100-4731, Rev FA
April 2003
APEX
™
and APEX Sentry
™
Radar Gauge
3-12
To set the display units:
1. Press UP until the display shows the display units option you want to
use.
2. Press ENTER to set the display units.
The menu then displays the Reference Height option.
NOTE
The gauge can output up to four variables via the HART Signal.
Setting the Reference Gauge Height
The Reference Height options are Reference Gauge Height or Actual Level.
The “Actual Level” option should be used only when there is a definite target
for signal reflection. Flat-bottom tanks and flat, horizontal liquid surfaces
reflect well. Slanted or turbulent surfaces may not provide sufficient reflection.
The Reference Gauge Height is the most critical setting for the gauge
because it is the basis for all other calculations—choose it carefully!
Figure 3-7. Reference Gauge
Height
NOTE
The Reference Gauge Height must be set in level (linear) units. If you want
volume output units on the integral display, you must first select level units,
set the Reference Height, null zones, and empty tank settings and save the
changes. You may then re-enter the menu and choose the desired volume
display units.
Set the Reference Gauge Height:
NOTE
The empty tank setting must be less than or equal to 25% of the gauge height.
When changing from a large gauge height to a smaller gauge height, it may
be necessary to first change the empty tank setting to a smaller value using
the Model 275 HART Communicator.
Reference Gauge Height
Actual Level
Reference Line
LEVEL-0005A
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