Endress+Hauser NXA820 - Page 36

Calculations Tankvision
36 Endress+Hauser
Density handling in NXA820
L00-NXA82xxx-16-00-00-xx-110
NXA820 offers various possibilities to enter and further process density information:
1. Manual entry of Reference density (from laboratory)
2. Manual entry of Observed density with the according sample temperature (from
laboratory) is required corrected for the hydrometer. With the above information and
the according Product information and ASTM/IP table (for density correction) the
reference density can be calculated.
3. Product pressure, temperature, density table (PTD table): look up table for observed
density with the use of measured product temperature and pressure. With the from the
table derived Observed density, the product temperature and the according Product
information and ASTM/IP table (for density correction) the reference density can be
calculated.
4. Density from HTG or HTMS calculation (→ ä 44). With the from the calculations
derived Observed density, the product temperature and the according Product
information and ASTM/IP table (for density correction) the reference density can be
calculated.
5. Density measured by Servo gauge. With the by the servo gauge measured Observed
density, the product temperature and the according Product information and ASTM/IP
table (for density correction) the reference density can be calculated.
Having the reference density and the according Product information and ASTM/IP table (for
volume correction) the VCF can be determined.
Observed density can be calculated by multiplying reference density with VCF.
8.1.12 Mass/Net Weight in Vacuum
L00-NXA82xxx-16-00-00-xx-074
Ref. Density1.
2.
3.
4.
5.
Servo Density
Product temp.
Ref. Density
VCF
Obs. Density
Obs. Density
Product temp.
Sample Temp.
Pressure
Hydrom. corr.
Obs. Density
HTG or HTMS
density
Table & Product
Code
Ref. Density
NSV
Liquid Mass/
NSW in VacuumAir
11.
Net Standard Weight
calculation