Reference Manual
00809-0100-4731, Rev FA
April 2003
3-5
APEX
™
and APEX Sentry
™
Radar Gauge
Figure 3-3. Reflecting Signal in a
Low Level Tank.
To activate the empty tank feature, use the HART Communicator and set the
Empty Tank parameter to a value greater than zero, but less than 25% of the
Reference Gauge Height (gauges with a serial number over 3217). If the
empty tank parameter is not specified when the gauge is ordered, it will be set
to approximately 10% of the Reference Gauge Height. If the signal is lost
below this setting, the radar gauge will output LEVEL=0 and the mA signal
corresponding to the zero level (usually 4 mA). The message will read “Empty
Tank.”
If the signal is lost outside of this configured distance (that is, at higher levels
in the tank), the radar gauge will go into alarm mode and indicate “Lost
Signal” (see Section 5: Hardware and Software Maintenance and
Troubleshooting).
APEXNEW/FOCUSAB.TIF
Low Level
Tank Line
Reference
Gauge Height
URV
(20 mA)
Reference
Line
LRV
(4 mA)
Empty Tank Line
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