Acquire provides a simple leak detection capability that is based on monitoring the discrepancy in flow rate between two different flow computers based on the following formula:

flow discrepancy alarm = (flow rate 1 - flow rate 2) > flow rate limit

Setup Acquire with either:

• 1 station with 2 flow computers 
  or
• 2 stations with 1 flow computer each

Select 'Custom Fields…' from the 'Config' menu.

Click the 'Add' button.

Enter the name of the limit field into the 'Full Field Name' field.

Select the 'Type' as "Enterable".

Set the 'Security Level' to "1".

Set the 'Value' to a typical default value. This can be changed in the HMI later.

Click the 'OK' button.

Click the 'Apply' button to make the new field available in the next formula.

Click the 'Add' button to add another custom field.

Enter the name of the alarm in the 'Full Field name' field and check the 'Alarm' checkbox.

Click the formula's 'Edit' button.

Enter the formula:

value:=(field("[Omni 6000 1] STR01 Gross Flowrate")-field("[Omni 6000 2] STR01 Gross Flowrate"))>field("Flow Rate Limit")

Note that the first flow rate is from Omni 6000 1 and the second one is from Omni 6000 2. The flow rate limit is from the "Acquire" flow computer and is the limit that was just set up.

Click the 'OK' button.

Click the 'OK' button.

Click the 'OK' button.

Now when the difference in the flow rate exceeds the flow rate limit an alarm called "Flow Rate Alarm" will be raised.