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Sometimes, in case of tank level measurement, it becomes difficult to calculate the LRV or the URV of the transmitter, or to empty
the tank for zero adjustment. So, not only with flange-mounted, but also with differential pressure transmitters using remote seals,
the Output % Reranging operation helps the user during transmitter calibration.
When it is know the level of the tank, expressed in percentage, the liquid level, it is possible to input this percentage that
automatically the transmitter recalculates its LRV and URV according to the new percentage value.
This can be done using a HART configuration tool on a 2600T Transmitter.
Two options are available as Output % Reranging operation:
1)
OP Range Low
2)
OP Range High
As example:
Actual level measured by the transmitter:
Transmitter output
= 27%
Calibration :
LRV
URV = +340 mbar
a) New input level measurement (Option 1) = 30%
New calibration : LRV
URV = +325.5 mbar
The transmitter output is now = 30%
Starting again from the initial settings:
Transmitter output
= 27%
Calibration :
LRV = -125 mbar
URV = +340 mbar
b) New input level measurement (Option 2) = 30%
New calibration : LRV
URV = +291.5 mbar
The transmitter output is now = 30%
- 38 -
ADDENDUM FOR OUTPUT % RERANGING
where both LRV and URV are adjusted
where only URV is change in accordance with the new input percentage
= -125 mbar
= -139.5 mbar
= -125 mbar
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