Understand monitoring for Flow In, Flow Out, and Idle conditions

If you, as an Administrator, would like your Controller to monitor for Flow In, Flow Out, and Idle conditions, you might set up something like the following:

• A rate point that determines Flow In. This example suggests that if there is a flow that is greater than 5 (indicating that there is more than a trickle entering the tank), that is considered to be an indication that there is Flow In.

• A valve (status) that controls Flow Out. If the valve represented by the status point is OPEN, we know that there is the possibility that the tank is allowing Flow Out.

• A status point that would determine that the tank is idle.

  

In the event that there is Flow In, the Controller's Rate Control will look like the following:

As the flow shown (366.00) is greater than 5, this indicates that there is Flow In.

In the event that there is Flow Out, the Controller's Status Control window will look like the following:

In the event that the tank is reporting an Idle state, the Status Control window will look like the following:

However, when there is an indication of flow, it takes primacy over reports of tank idling. In this case, because there is Flow Out and Flow In, the External Flow state is Floating.