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Gas- and Steam Flowcomputer
DigiFlow 515
Operating Manual
8
Options
:
Analog Outputs:
Function:
Selectable: Output current proportional to standard display or of other Parameter See Table on Page
35. Setpoints at 4 mA and 20 mA, linear interpolation between.
Output Span:
0 – 20 mA or 4 –20 mA selectable.
Resolution: 12
Bit
Max. Load:
500
Ω
internally powered.
800
Ω
externally 24 V powered.
Powering:
If there is no external supply >15V the output will be internal powered automatically.
Control of a Sensor–Purge–
Unit:
Function:
Two relays control the solenoid activated valves of a Sensor Purge Unit. During the purging time
and an additional selectable time after purging, the flow input is maintened.
Time between purging:
10 minutes to 31 days 23 hours 50 minutes.
Purge Duration:
1 to 999 s
Time Constant:
1 to 99 s
4 Algorithms
Ideal Gas:
Display:
Corrected Volume (m
3
or SCF), Mass (kg or lbs)
Temperature Range:
-273 °C (-460 °F) to +1,000 °C (1,832 °F)
Pressure Range:
0 kPa
abs
(0 psia) to 100,000 kPa
abs
(14,514 psia)
General Gas:
Gases:
Handles most gases where critical temperature, critical pressure and specific gravity are known.
Compressibility:
Calculation using the Redlich–Kwong equation.
Ranges:
Same as Ideal Gas.
Natural Gas:
Gases:
Natural Gases with a gross caloric value of 31.8 MJ/m
3
to 38.8 MJ/m
3
, specific gravity of 0.554 to
0.75, density at reference conditions of 0.716 kg/m
3
to 0.970 kg/m
3
, and a CO
2
– and N
2
– molar
fraction of 15% each.
Compressibility: Uses
the
AGA–NX–19–mod equation.
Temperature Range:
-40 °C (-40 °F) to 115,6 °C (240 °F).
Pressure Range:
101.325 kPa
abs
(14.7 psia) to 13,790 kPa
abs
(2,001 psia).
Steam
:
Calculation:
Uses 1967 IFC Formulation (ASME) equations to calculate specific weight and enthalpy of steam.
Steam Type:
Liquid Water, saturated and superheated steam.
Temperature Range:
0.01 °C (32.02 °F) to 800 °C (1,472 °F).
Pressure Range:
0 kPa
abs
(0 psia) to 100,000 kPa
abs
(14,514 psia).
Saturated steam:
Either the temperature or pressure input required (not both).
Summary of Contents for digiflow 515
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