Endress+Hauser NRF81 - Page 199

Tankside Monitor NRF81 Operating menu
Endress+Hauser 199
"HTG" submenu
Overview
Hydrostatic Tank Gauging (HTG) is a method to calculate the level and the density of the
product inside a tank using pressure measurements only. The pressure is measured at
different heights of the tank using one, two or three pressure sensors. With these data
either the density or the level of the product (or both) can be calculated.
HTG modes
Four HTG modes can be selected in the HTG mode parameter (→  206). They
determine which variables are measured and which are calculated. Depending on the
selected mode a number of additional parameters are required for the calculation.
HTG mode (→  206) Measured
variables
Required additional
parameters
Calculated variables
P1 only P1 • ρ
P
• g
• H
P1
L
HTG
P1 + P3 • P1
• P3
• ρ
P
• ρ
V
• ρ
A
• g
• H
P1
• H
P3
L
HTG
(more precise calculation for
pressurized tanks)
P1 + P2 • P1
• P2
• ρ
A
• g
• H
P1
• H
P1-P2
• ρ
P
• L
HTG
P1 + P2 + P3 • P1
• P2
• P3
• ρ
V
• ρ
A
• g
• H
P1
• H
P1-P2
• H
P3
• ρ
P
• L
HTG
(more precise calculation
for pressurized tanks)