Commissioning Batch Controller RA33
26 Endress+Hauser
6.2.1 Batch controller with flow measurement and 1-stage batching
This application describes the standard application of the Batch Controller RA33. In this application,
it acts as a dosing device. The flow is measured and the valve is controlled in such a way that the
specified quantity of medium is batched precisely.
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Fig. 24: Batch controller with flow measurement and 1-stage batching
Input signals:
Flow, (pulse input or current input)
Output signals:
Valve control (relay or open collector)
Required settings:
a. Flow input: Enter pulse value or measuring range of the 0/4 to 20 mA input.
b. Valve control: Set the choice of filling stages to 1-stage. Assign the selected output to control
the filling stage.
c. Preset counter: Before starting a batch for the first time, a value must be entered for the preset
counter(→ ä 22). Otherwise batching cannot commence. The preset counter defines the
quantity of medium which the Batch Controller RA33 batches as precisely as possible. The last
preset counter value to be used is stored in the device and applied for new batching operations
until the value is changed.
d. After-run correction: The first time the automatic after-run correction function of the Batch
Controller RA33 is used, the controller first has to learn what the after-run quantity is. The
after-run quantity is the volume of medium that still flows between the time the control output
switches to the time no more flow is recorded. The after-run quantity thus depends on the
switching delay and valve closing time. The batch controller tries to correct the switch output
by this amount to ensure that the batching result is as accurate as possible.
To keep excess amounts to a minimum during these initial runs, it is advisable to enter a value
for the manual after-run quantity and to teach the device with smaller test quantities as
medium overflow can be expected.
Display variables:
Preset counter, batch counter, volume flow, daily, monthly and annual counters and totalizer for
batched quantity, number of batches.
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