EF200R-C
27
Water mass flow
Sensor version
Mass (integrated temperature measurement)
Process pressure
[bar abs.]
Flow velocity
[m/s (ft/s)]
Reynolds number
range
Measured value deviation
Standard
All pressures
All velocities
Re
2
to Re
max
A1
< 0.85 %
Re
1
to Re
2
A2
< 2.7 %
1)
Order code for "Calibration flow", option N "0.65% volume PremiumCal 5-point"
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/VC) 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 is calibrated according to the ordered process connection. This calibration
takes account of the edge at the transition from the mating pipe to the process connection. If
the mating pipe used deviates from the ordered process connection, a diameter mismatch
correction can compensate for the effects. The difference between the internal diameter of the
ordered process connection and the internal diameter of the mating pipe used must be taken
into consideration.
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
3)
single gas, gas mixture, air: NEL40; natural gas: ISO 12213-2 contains AGA8-DC92, AGA NX-19, ISO 12213-3 contains SGERG-88 and AGA8
Gross Method 1
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.
Flange connection:
• DN 15 (½"):
±
20% of the internal diameter
• DN 25 (1"):
±
15% of the internal diameter
• DN 40 (1½"):
±
12% of the internal diameter
• DN 侒 50 (2"):
±
10% of the internal diameter
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
