Endress+Hauser Dosimass Modbus RS485 Operating Instructions Manual page 62

Technical data
Repeatability
Response time
Influence of medium
temperature
Influence of medium
pressure
Design fundamentals
62
Base repeatability
Dosing time [s]
0.75 s < t < 1.5 s
a
1.5 s < t < 3 s
a
3 s < t
a
Density (liquids)
±0.00025 g/cm 3
Temperature
±0.25 °C ± 0.0025 · T °C (±0.45 °F ± 0.0015 · (T–32) °F)
The response time depends on the configuration (damping).
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
Maximum measured error in % o.r.
± BaseAccu
A0021332
ZeroPoint
⋅
±
100
MeasValue
A0021333
Maximum repeatability in % o.r.
A0021335
ZeroPoint
⋅
⋅
100
± ½
MeasValue
A0021336
Dosimass Modbus RS485
Standard deviation [%]
0.2
0.1
0.05
Endress+Hauser
A0021339
A0021334
A0021340
A0021337