SUPERtrol-2 (ST2) Application Notes
Steam Mass Flow vs. Volumetric Flow
Most flow measurement devices measure the velocity of the flow stream and use the pipe
dimensions in order to infer volumetric flow. A velocity based device cannot correct for changes
in density that are caused by pressure and temperature changes. This means that if the velocity
(inferred volumetric flow) remains constant but the density of the steam changes the flow meter
output will not change.
The customer will be paying the same amount for less energy.
By measuring pressure, temperature and flow and using a SuperTROL-II to perform the mass
calculation and compensation function any change in the properties of the flow stream will be
detected.
The customer is therefore billed only for the energy that is used.
Keywords:
SUPERtrol-2, ST2, steam, mass flow, pressure, density, enthalpy, buying steam, billing for steam
The SUPERtrol utilizes the pressure and temperature signals as an entry point to its internally held steam tables, the density of the steam is then computed. The signal from the Vortex meter, which is proportional to volumetric steam flow, is then multiplied by the density in order to yield the mass flow of steam.
Keywords:
SUPERtrol II, ST2, steam, mass, mass flow, heat flow, mass total, heat total, pressure, temperature, specific volume and specific enthalpy
Typical Heated/Chilled Water Metering System Using Magnetic Flowmeter System, Two Temperature Transmitters and Electronic Flow Computer
Keywords:
SUPERtrol II, Supertrol-2, ST2, flow computers, magnetic flowmeter, steam flow computer, energy metering
SUPERtrol II monitoring heat flow across a heat exchanger in conjunction with a Brooks model 5000 electromagnetic flowmeter and model 3560 remote electronics
Keywords:
SUPERtrol II, ST2, SUPERtrol-2, Brooks, electromagnetic, heat, 3560
SuperTROL-II Flow Computer Monitoring the
Volumetric Flow of Natural Gas with a Roots® Rotary
Gas Meter and Model CEX Electronic
Transmitter
Keywords:
SUPERtrol-2, Roots, natural gas, positive displacement, CEX
SUPERtrol II monitoring compressed air flow, displaying compensated volumetric flow and giving two analog outputs
Keywords:
SUPERtrol II, ST2, air, vortex, compensated, mass, mass flow, heat flow, mass total, heat total, pressure, temperature, specific volume and specific enthalpy
ES-749 Mass/Heat Flow Computer Monitoring
Steam Mass Flow
Keywords:
ES749, steam, vortex. flowmeter, ST2 Special
MS-748 Flow Computer With Compressibility
Compensation Monitoring LPG Gas on a Mass Basis
Keywords:
MS748, ST2 Special, LPG, compressibility
Kessler-Ellis Products offers two BACnet Communications Protocols BACnet MS/TP and BACnet IP
Keywords:
BACnet MS/TP, BACnet IP, flow computer, communication, Supertrol Series, Supertol Family, ST1, ST2
Gas equations and gas calculations for U.S. Units
Keywords:
gas, density, calculation, equation
Gas equations and gas calculations for Metric Units
Keywords:
gas, density, calculation, equation
Compatibility and wiring connections for KEP products and turbine flow meters.
Keywords:
turbine, BAT R/T, minitrol, supertrol I, supertrol II, keptrol R/T, batchtrol, flowtrol, keptrol F/C, squirt
One of the most confusing aspects of instrumentation is the statement of accuracy, whether it be for a flow meter or for a calculation device.
We commonly see statements such as, “accuracy ±0.5%,” what we should really be talking about is a measurement uncertainty of ±0.5% or an accuracy of 99.5%.
The statement of a measurement uncertainty for a flow meter may be given as ±0.5%, but what is it 0.5% of, and over what range? Any given flow meter is prevented, for reasons of sensitivity or by the limitations of the physical phenomenon that makes it operate, from reading down to a flow of zero.
Keywords:
accuracy
Hazardous Locations
Hazardous locations are classified according to the hazardous materials present.
- Class I locations are those in which flammable gasses or vapors are present.
- Class II locations are those in which combustible dust is present
- Class III locations are those in which combustible fibers are present
Keywords:
Xtrol, hazardous, CENELEC, FM, UL
