Endress+Hauser dosimass, Руководство по эксплуатации

Страница: 35 / 58

Dosimass Technical data
Hauser 35
10.1.6 Performance characteristics
Reference operating
conditions • Error limits following ISO/DIS 11631
• Water with +15 to +45 °C (+59 to +113 °F) at 2 to 6 bar (29 to 87 psi)
• Specifications as per calibration protocol ±5 °C (±9 °F) and ±2 bar (±29 psi)
• Accuracy based on accredited calibration rigs that are traced to ISO 17025
Max. measured error o.r. = of reading; 1 g/cm
3
= 1 kg/l

Mass flow (depends on the calibration):
±0.15% o.r. (1 to 4 m/s (3.28 to 13.1 ft/s))
or
±0.3% ± [(zero point stability : measured value) · 100]% o.r.
or
±5% ± [(zero point stability : measured value) · 100]% o.r.
Density (liquids):
Reference conditions
• ±0.0005 g/cm
3
Field density calibration
(1)
• ±0.0005 g/cm
3
Standard density calibration
(2)
• ±0.02 g/cm
3

After on-site field density calibration under process reference conditions

Performed on all sensors, valid over entire medium temperature and density range (

ä
36)
Zero point stability:
Calculation example:
Give that: Dosimass DN 15, flow = 1300 kg/h (47.8 lb/min)
Measured error: ±0.3% ± [(zero point stability : measured value) · 100]% o.r.
Measured error: ±0.3% ± (0,65 kg/h : 13 00 kg/h) · 100% = ±0.35%

±0.3% ± (0,0239 lb/min : 47,8 lb/min) · 100% = ±0.35%
Repeatability
Influence of medium
temperature When there is a difference between the temperature for zero point adjustment and

the process temperature, the typical measured error is ±0.0003% of the full scale value/°C.
Influence of medium pressure The effect of a difference in pressure between the calibration pressure and the process pressure on
the measured error for mass flow is negligible.
DN Max. full scale value Zero point stability
[mm] [inch] [kg/h] [lb/min] [kg/h] [lb/min]
08 3/8" 2000 74 0.20 0.0074
15 ½" 6500 239 0.65 0.0239
25 1" 18 000 662 1.8 0.0662
Dosing time [s] Standard deviation [%]

0.75 0.2

1.5 0.1

3.0 0.05
Density (liquids): ±0.00025 g/cm³