Influence Of Fluid Pressure; Design Fundamentals - Endress+Hauser Proline Promass 40E Technical Information

Proline Promass 40E

Influence of fluid pressure

Design fundamentals

Endress+Hauser
The table below shows the effect on accuracy of mass flow due to a difference between calibration
pressure and process pressure.
DN
[mm] [in]
8 ³⁄₈
15 ½
25 1
40 1½
50 2
80 3
o.r. = of reading
BaseAccu = base accuracy in % o.r.
BaseRepeat = base repeatability in % o.r.
MeasValue = measured value (in flow units consistent with the zero point stability value →  7)
ZeroPoint = zero point stability
Calculation of the maximum measured error depending on flowrate
Flowrate (in flow units consistent with the zero
point stability value →  7)
ZeroPoint
³ ⋅
100
BaseAccu
ZeroPoint
⋅
< 100
BaseAccu
Calculation of the repeatability depending on flowrate
Flowrate (in flow units consistent with the zero
point stability value →  7)
⋅
½ ZeroPoint
³
⋅
100
BaseRepeat
⋅
½ ZeroPoint
⋅
< 100
BaseRepeat
Example for maximum measured error
E [%]
2.5
2.0
1.5
1.0
0.5
0
0 10 20
E = Error: Maximum measured error as % o.r.
Q = Flow rate as %
Promass E
[% o.r./bar]
no influence
no influence
no influence
no influence
–0.009
–0.020
Maximum measured error in % o.r.
± BaseAccu
A0021332
ZeroPoint
±
MeasValue
A002133
Repeatability in % o.r.
A0021335
ZeroPoint
⋅
± ½
MeasValue
A0021336
30 40 50 60
⋅
100
⋅
100
100 Q [%]
70 80 90
A0021339
A0021334
A0021340
A0021337
A0021279
9