Astar HT-3300 Spécifications Page 83

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73
Reference Manual
00809-0100-4811, Rev DA
Section 4: Basic Configuration/Start-Up
January 2015
Basic Configuration/Start-Up
4.4.13 4 and 20 mA points
When setting the range values, it is possible to enter the values directly using the keypad on the
Field Communicator, or you may use actual values (HART command [1, 3, 4, 2]). Keep in mind
that the 20 mA value must be below the upper transition zone. If the 20 mA point is set to a
point within the Transition Zone, the full range of the analog output is not used.
Make sure the 20 mA value is below the Upper Null Zone (UNZ). (This parameter can be used if
there are measurement problems in the upper part of the tank, see Disturbances at the top of
the tank on page 102). The UNZ is equal to zero in the default configuration.
The 4 mA point must be above the lower transition zone. If the 4 mA point is set to a point within
the transition zone or below the probe end (tank bottom for example), the full range of the
analog output is not used.
See Transition zones on page 16 for more information on the size of upper and lower transition
zones.
Figure 4-7. Range Values
HART Comm
1, 3, 4, 3
20 mA Upper Range Value (URV)
Upper transition zone
Product level
Interface level
Lower transition zone
4 mA Lower Range Value
(LRV)
Upper reference point
Range 0-100 %
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