LPGmass Modbus RS485
Technical data
Hauser
79
The outputs have the following base accuracy specifications.
Repeatability
o.r. = of reading; 1 g/cm
3
= 1 kg/l; T = medium temperature
Base repeatability
Mass flow
±0.10 % % o.r.
Volume flow
±0.15 % % o.r.
Density
±10 kg/m³ (±0.01 SGU)
Temperature
±0.25 °C ± 0.0025 · T °C (±0.45 °F ± 0.0015 · (T–32) °F)
Response time
• The response time depends on the configuration (damping).
• Response time in the event of erratic changes in the measured variable (mass flow only):
After 100 ms → 95 % of full scale value
Influence of medium
temperature
Mass flow
When there is a difference between the temperature for zero point adjustment and the
process temperature, the typical measured error of the sensor is ±0.0003 % of the full
scale value/°C (±0.00015 % of the full scale value/°F).
Influence of medium
pressure
The table below shows the effect on accuracy of mass flow due to a difference between
calibration pressure and process pressure.
o.r. = of reading
DN
[% o.r./bar]
[% o.r./psi]
[mm]
[in]
8
³⁄₈
no influence
15
½
no influence
25
1
no influence
40
1½
no influence
50
2
–0.009
–0.0006
Design fundamentals
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
Maximum measured error in % o.r.
ZeroPoint
BaseAccu
⋅
100
³
A0021332
± BaseAccu
A0021339
ZeroPoint
BaseAccu
⋅
100
<
A0021333
ZeroPoint
MeasValue
⋅
100
±
A0021334
