Meriam M2110L SMART LEVEL GAUGE - Manual (Page 20)

9R143 Dated 3/2011
18
P9 – TANK CYLINDRICAL CAPACITY
The Smart Level Gauge calculates level based on measured hydrostatic pressure, by drawing a relationship between
the full tank hydrostatic pressure (register P4, page 14), and the total capacity of the tank (volume or mass). The
residual pressure (register P3, page 12) and tank type (register P11, page 20) are also considered in the calculations.
The P9 and P10 registers together specify the tank capacity referred to above. The P9 value may be entered in any
desired Engineering Unit, except InH2O (refer to page 7 for available units); User Units and Percent are also
acceptable. The value programmed in P9 depends on the type of tank, as described below:
LINEAR TANK Cylindrical/Flat Ends Cylindrical/Dished Ends Spherical
P9=Volume/mass of the
full tank. (The full volume
is comprised of the entire
cylindrical section.) P9=Volume/mass of the
full tank. (The full volume
is comprised of the entire
cylindrical section.) P9=Volume/mass of the
cylindrical portion only.
(Tank capacity minus
dished ends capacity.) P9=0. (The full volume is
comprised essentially of 2
dished ends, entered in the
P10 register.)
QUICK REFERENCE: P9, TANK CYLINDRICAL CAPACITY
Px Name Description Value Range Notes
P9 Tank Cylindrical
Capacity
The capacity, in Engineering
Units, in the cylindrical portion
of the tank only. 0 to 9,999
(Keypad)
0 to 19,999
(Serial)
P9 = 0 for
spherical
tanks.
Automatic Update
If the Engineering Unit is changed in Measure Mode (see page 7), the value in the P9 and P10 registers will
automatically change to reflect the new Engineering Unit. This allows changing the Engineering Unit in Measure
Mode and maintaining a correct level display.
STEP BY STEP: P9, TANK CYLINDRICAL CAPACITY
The process of programming this register is exactly the same as other real-value programmable registers. Please
refer to that procedure on page 12. However, the following notes are specific to the P9 and P10 register:
Notes 1. After completing the P9 or P10 value programming (step 9 on page 13), the gauge will then prompt
for Engineering Unit selection by flashing the current unit. To complete P9 or P10 programming,
proceed with Engineering Unit selection (described on page 7). This selection defines the units that
were programmed into P9 and P10. If the units are not to be changed, you may simply re-enter or
abort the Engineering Unit selection process (page 7).
2. Register P9 and P10 values always represent the same Engineering Unit. Therefore, if the unit is
changed during programming of one register, it may be necessary to re-program the other.
3. If the current Engineering Unit is InH
2
O when P9 or P10 is opened for programming, the gauge will
enter a view-only mode (see page 21). The registers cannot be changed in this mode. You must first
select a different Engineering Unit in order to program P9 or P10 (see page 7). This is required to
maintain level scaling relationships between hydrostatic pressure and the user’s fluid characteristics.
All Models