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Operation Mode – Batch Totalizers and InventoriesOperation Mode – Custody TransferOperation Mode
Chapter 18
Operation Mode – Batch
18.1 About this chapter
This chapter explains how to use the discrete batch control application and how to perform batch
AOC (automatic overshoot compensation).
Note: Before you can use the discrete batch application, it must be configured. For information on
configuring the discrete batch application, see Chapter 11.
Note: For information on formatting and printing batch tickets, see Chapter 15.
18.2 About discrete batching
Discrete batching is used to start flow, then stop flow automatically when the target amount of process
fluid has flowed through the sensor. During a batch, flow may be stopped and resumed. A batch may
also be ended before the target is reached.
The normal batching sequence is as follows:
1. Select a batch preset (see Section 17.5.3). The batch preset determines the target, how end
warnings and overruns will be handled, and, for 2-stage batching only, the point at which the
primary and secondary valves will be opened and the point at which the primary valve will be
closed.
2. Start the batch. The operator can start the batch manually, using the
START button on the batch
process screen, or a discrete input or discrete event can be configured to start the batch (see
Section 11.7). Before a batch can be started, the previous batch must be ended and the totals
must be reset.
Note: Reset may be automatic (Reset on Start is enabled; see Section 11.5) or manual via the RESET
button or an assigned discrete input (see Section 11.7).
3. In normal operation, the flowmeter will stop the batch automatically when the configured
target is reached.
The operator can halt the batch manually, using the
STOP or END buttons on the batch process
screen. The STOP and END functions can also be assigned to a discrete input or discrete event
(see Section 11.7).
• If the batch is stopped, the current batch totals are retained, and pressing the
RESUME
button will restart the batch from the current totals. The RESUME function can also be
assigned to a discrete input or discrete event (see Section 11.7).
• If the batch is ended, it cannot be restarted (with one exception: by increasing the batch
target to a value that is greater than the current batch total).
Table 18-1 describes batch events and how the batch function buttons operate under different batch
conditions.
For examples of batch processing, including the effects of
STOP and RESUME, see Section 18.4.
For a discussion of batch control functions, see Section 11.7.