Steam custody transfer and utility balancing customers using a DP element under the AGA-3 standard need thermal expansion and calibration effects accounted for correctly, not just a basic flow reading. The Contrec 515 SC05 Steam Flow Computer is built for exactly this.
It runs AGA-3 compliant DP flow calculations while accounting for thermal expansion and the primary element’s own calibration conditions. Stacked DP transmitters extend the turndown ratio without losing low-flow accuracy, and mass flow and energy are calculated per the IAPWS-IF97 Industrial Formulation, with dedicated logic for water, saturated steam, and superheated steam.
In actual application, this unit usually sits out on process plant rather than in a control room, so it comes in a weatherproof IP65 field-mounting enclosure with a backlit alphanumeric LCD and a keypad. It also has an adjustable 8-24V DC sensor supply and isolated 4-20mA loop retransmission for integration into plant systems.
Before we quote this, we would normally check your DP transmitter range (single or stacked), your steam pressure and temperature, and whether you are measuring saturated or superheated steam.
Hope this helps.
