Emerson Series 3000 MVD User Manual

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This chapter explains how to use the discrete batch control application and how to perform batch 
AOC (automatic overshoot compensation).

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 

 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 

 or 

 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 

 

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 

 and 

, see Section 18.4. 

For a discussion of batch control functions, see Section 11.7.