Issue/Rev. 0.2 (12/12) MN0M023 • Page 149
Device Functions Proline Promass 83 10 Block SPECIAL FUNCTION
FIX COMPENSATION
QUANTITY
(7204)
Use this function to specify a positive or negative compensation quantity. The
compensation quantity balances out a constant, system-related incorrect quantity. This
can be caused, for example, by a pump over-running or by the closing time of a valve.
The compensation quantity is determined by the system operator. A negative
compensation quantity must be specified for overbatching and a positive compensation
quantity for underbatching.
! Note!
The compensation quantity affects batching quantity only and does not affect the after
run compensation.
User input:
Floating-point number with sign (depends on nominal diameter)
Factory setting:
0 [unit]
! Note!
• If the entry range is not sufficient for the compensation quantity, the batching quantity
may have to be adjusted.
• The appropriate unit is taken from the function group SYSTEM UNITS (ACA),
(see page 17).
COMPENSATION MODE
(7205)
Use this function to determine whether the after run quantity or a fixed compensation
quantity should be taken into account at the next batching.
Options:
OFF
MODE 1
MODE 2
Factory setting:
OFF
! Note!
The pressure shock suppression must be switched off if MODE 1 or MODE 2 is selected
in this function (see function PRESSURE SHOCK SUPPRESSION (6404) on page 123).
Detailed explanations and information
When batching using the optional software package BATCHING, process-related variable
after run quantities or incorrect quantities can be determined and balanced out (by
computer) by means of various functions. This ensures a high level of accuracy
throughout the entire batching range.
• Response when OFF is selected:
The batching ends as soon as the quantity specified in the function BATCH
QUANTITY (7203) has been achieved. If after running occurs, this is not recorded and
is not taken into consideration during the next batching. In this way, in the event of
process-related after running, the effective batched quantity is generally larger than the
batching quantity specified.
• Response when MODE 1 is selected:
For short batchings and for batching cycles that follow on quickly from one other.
Batching ends before the quantity specified in the function BATCH QUANTITY (7203)
is achieved and the after run quantity is recorded. The exact batching switch-off time
is calculated based on the previous after run quantities.
The number of after run quantities which are to influence the calculation can be
specified in the functions AVERAGING DRIP (7207) and CALCULATION MODE
(7206). The after run quantity in MODE 1 is determined between the switch-off point
and the first undershooting of the low flow cut off. Any subsequent fluid movements
are not taken into account.
Function description
SPECIAL FUNCTION o BATCHING FUNCTION o CONFIGURATION
(continued on next page)
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