Endress+Hauser Dosimass IO-Link Operating Instructions Manual page 57

Dosimass IO-Link
Influence of ambient
temperature
Influence of medium
temperature
Influence of medium
pressure
Design fundamentals
Endress+Hauser
Pulse/frequency output
Temperature coefficient No additional effect. Included in accuracy.
Mass flow
If there is a differential between the temperature during zero adjustment and the process
temperature, the typical measurement error of the sensor is ±0.0002 % of the full scale
value/°C (±0.0001 % of the full scale value/°F).
Temperature
±0.005 · T °C (± 0.005 · (T – 32) °F)
A difference between the calibration pressure and process pressure does not affect
accuracy.
o.r. = of reading, o.f.s. = of full scale value
BaseAccu = base accuracy in % o.r., BaseRepeat = base repeatability in % o.r.
MeasValue = measured value; ZeroPoint = zero point stability
Calculation of the maximum measured error as a function of the flow rate
Flow rate
ZeroPoint
⋅
100
³
BaseAccu
ZeroPoint
⋅
< 100
BaseAccu
Calculation of the maximum repeatability as a function of the flow rate
Flow rate
⋅
½ ZeroPoint
⋅
100
³
BaseRepeat
⋅
½ ZeroPoint
⋅
< 100
BaseRepeat
Example of maximum measurement error
E [%]
2.5
2.0
1.5
1.0
0.5
0
0 5 10 15 20
E Maximum measurement error in % o.r. (example)
Q Flow rate in % of maximum full scale value
Maximum measured error in % o.r.
± BaseAccu
A0021332
ZeroPoint
⋅
±
100
MeasValue
A0021333
Maximum repeatability in % o.r.
A0021335
ZeroPoint
⋅
± ½
MeasValue
A0021336
25 30 35 40 45 50 55
⋅
100
60 65 70 75 80 85 90
Technical data
A0021339
A0021334
A0021340
A0021337
95 100 Q [%]
A0030289
57