EF200W-C
23
Mass flow (user-specific liquids)
Example
• Acetone is to be measured at fluid temperatures from +70 to +90 °C (+158 to +194 °F).
• For this purpose, the Reference temperature parameter (7703) (here 80 °C (176 °F)), Reference
density parameter (7700) (here 720.00 kg/m
3
) and Linear expansion coefficient parameter
(7621) (here 18.0298 × 10
-4
1/°C) must be entered in the transmitter.
• The overall system uncertainty, which is less than 0.9 % for the example above, is comprised of the
following measurement uncertainties: uncertainty of volume flow measurement, uncertainty of
temperature measurement, uncertainty of the density-temperature correlation used (including the
resulting uncertainty of density).
Mass flow (other media)
Depends on the selected fluid and the pressure value, which is specified in the parameters. Individual
error analysis must be performed.
Diameter mismatch correction
The measuring device can correct shifts in the calibration factor which are caused, for example, by a
diameter mismatch between the device flange (e.g. ASME B16.5/Sch. 80, DN 50 (2")) and the
mating pipe (e.g. ASME B16.5/Sch. 40, DN 50 (2")). Only apply diameter mismatch correction within
the following limit values (listed below) for which test measurements have also been performed.
If the standard internal diameter of the ordered process connection differs from the internal
diameter of the mating pipe, an additional measuring uncertainty of approx. 2 % o.r. must be
expected.
Example
Influence of the diameter mismatch without using the correction function:
• Mating pipe DN 100 (4"), Schedule 80
• Device flange DN 100 (4"), Schedule 40
• This installation position results in a diameter mismatch of 5 mm (0.2 in). If the correction
function is not used, an additional measuring uncertainty of approx. 2% o.r. must be expected.
• If the basic conditions are met and the feature is enabled, the additional measuring uncertainty is
1 % o.r.
For detailed information on the parameters for diameter mismatch correction, see the
Operating Instructions
Accuracy of outputs
The outputs have the following base accuracy specifications.
Current output
Accuracy
±10 µA
Pulse/frequency output
o.r. = of reading
Accuracy
Max. ±100 ppm o.r.
