Performance Characteristics; Reference Operating Conditions; Maximum Measured Error; Repeatability - Endress+Hauser Proline Prosonic Flow 91W Technical Information

Reference operating
conditions

Maximum measured error

Repeatability

10

Performance characteristics

• Fluid temperature: +28 °C ± 2 K
• Ambient temperature: +22 °C ± 2 K
• Warm-up period: 30 minutes
Installation:
• Sensor and transmitter grounded.
• The measuring sensors are mounted correctly.
Measured error
The measured error depends on a number of factors. A distinction is made between the measured error of the
device (Prosonic Flow 91 = 0.5 % of the measured value) and an additional installation-specific measured error
(typically 1.5 % of the measured value) that is independent of the device.
The installation-specific measured error depends on the installation conditions on site, such as the nominal
diameter, wall thickness, real pipe geometry, fluid etc. The sum of the two measured errors is the measured
error at the measuring point.
%
3.5
2.0
0.5
Example of the measured error in a pipe with a nominal diameter DN > 200 (8")
a Measured error of the device (0.5 % o.r. ± 3 mm/s
b Measured error due to installation conditions (typically 1.5 % o.r.)
c Measured error at the measuring point: 0.5 % o.r. ± 3 mm/s + 1.5 % o.r. = 2 % o.r. ± 3 mm/s.
Measured error at the measuring point
The measured error at the measuring point is made up of the measured error of the device
(0.5 % o.r.) and the measured error resulting from the installation conditions on site.
Given a flow velocity > 0.3 m/s (1 ft/s) and a Reynolds number > 10000, the following are typical error limits:
Nominal
Device error limits
diameter
DN 15 (½") ±0.5 % o.r. ± 5 mm/s
DN 25 to 200 ±0.5 % o.r. ± 7.5 mm/s
> DN 200 ±0.5 % o.r. ± 3 mm/s
o.r. = of reading
Measurement Report
If required, the device can be supplied with a measurement report. To certify the performance of the device,
a measurement is performed under reference conditions. Here, the sensors are mounted on a pipe with a
nominal diameter of DN 100 (4").
The measurement report guarantees the following error limits of the device
(at a flow velocity > 0.3 m/s (1 ft/s) and a Reynolds number > 10000):
Nominal diameter Guaranteed error limits of the device
Prosonic Flow W DN 15 (½"), DN 25 (1"), DN 40 (1½"), DN 50 (2") ±0.5 % o.r. ± 5 mm/s
Prosonic Flow W DN 100 (4")
o.r. = of reading
Max. ± 0.3 % for flow velocity > 0.3 m/s (1 ft/s)
b
0 2 4 6 8
Installation-specific
+
error limits (typical)
+ ±2.5 % o.r.
+ ±1.5 % o.r.
+ ±1.5 % o.r.
Proline Prosonic Flow 91W
c
a
10 12 m/s
Error limits at the measuring point

(typical)

±3 % o.r. ± 5 mm/s

±2 % o.r. ±7.5 mm/s

±2 % o.r. ± 3 mm/s
Guaranted error limits of the device
±0.5 % o.r. ± 7.5 mm/s
Endress+Hauser
A0011347