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Steam Computer – DP Meter (Volumetric)
The 515-SC06 application measures the volume, mass and energy content of steam by using single or stacked differential pressure volumetric flow inputs in conjunction with a temperature and/or pressure input.
A selection of various modes makes it suitable for many steam applications. The instrument calculates the flow according to generic differential pressure equations and incorporates the conditions at which the flowmeter was calibrated.
The instrument calculates the mass flow and energy according to the IAPWS Industrial Formulation (1997) for the thermodynamic properties of steam. The equations use pressure and temperature values to determine the specific volume and the specific enthalpy.
Calculations
The steam energy calculations are based on the IAPWS Industrial Formulation (1997).
Superheated steam regions are:
• 0°C < t < 800°C P < 100MPa
• 32°F < t < 1472°F P < 14500psia
• 800°C < t < 2000°C P < 10MPa
• 1472°F < t < 3632°F P < 1450psia
Saturated steam regions are:
• 0°C < t < 374°C (critical temperature)
• 32°F < t < 705°F
• P < 22MPa (critical pressure)
• P < 3190psia
Water region is:
• 0°C < t < t saturation at system pressure
• 32°C < t < t saturation at system pressure
Formulas:
• Mass flow = Volume flow/Specific volume
• Energy flow = Mass flow x Specific enthalpy
Features
Tailored for differential pressure volumetric meters with single or stacked transmitters
Generic differential pressure flow calculations
Uses IAPWS-IF97 steam calculation
Suitable for Water, Saturated and Superheated steam applications
Allows for square law and non-linear correction
Selection of second language and user tags
RTC logging with over 1000 entries
Infra-red communications port on front panel
Pulse width and scaling of pulse output
4-20mA retransmission
Selectable protocols on serial ports including Modbus RTU and printer output
Front panel adjustment of 8-24V DC output voltage
Backlit Display
LCD Backup Typical plant diagram
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