Configure PPTC instructions

Use the
Advanced
 tab of the
PPTC Properties
 dialog box to configure the Pressure/Temperature Compensated Flow (PPTC) instruction.
To configure PPTC instructions
  1. On the instruction in the routine, perform one of these actions:
    • On the Ladder or FBD instruction, select .
    • In the Structured Text editor, right-click the tag name and select
      Configure <tag name>
      .
  2. Open the
    Advanced
     tab.
  3. Set the parameters:
    • Flow below which to report zero flow
      . If Out_Flow is less than this cutoff value, 0.0 appears.
    • Reference (full-scale) differential pressure
      . Reference (full-scale) differential pressure (for example, WC).
    • Reference flow in volumetric units at reference DP
      . Reference flow in volumetric units (for example, CFM) at reference differential pressure (DP).
    • Zero input-unit pressure in absolute unit
      . Zero input-units pressure in absolute units (for example, PSIA).
    • Zero input-unit temperature in absolute unit
      . Zero input-units temperature in absolute units (for example, R or K).
    • Standard pressure
      . Standard pressure in Inp_PAct units (for example, PSIG).
    • Standard temperature
      . Standard temperature in Inp_TAct units (for example, F or C).
    • Flow calculation method
      . 1 = Use Inp_DPAct (square root curve) to calculate flow; 0 = Use Inp_FAct (linear).
  4. Select
    Apply
    .
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