27
TN4FCXA2
j
-EDF-
E
h
E
ρ
ρ
'
ρ
'
Without reference column
Connect the high pressure side of the
transmitter to the bottom of the tank and the
low pressure side to the take-off pipe from
the top of tank.
The formulae for the calculation of the level:
Zero =
ρ.
E -
ρ
'.(E + h)
Scale (∆P) =
ρ.
h
ρ
= specific weight of the fluid mechanism
ρ
'= specific weight of the filling liquid
for the capillaries of the
separators
max level
min level
High
pressure
Low pressure
Niveau Maxi
Niveau Mini
Haute pression
Basse
Pression
h
h’
ρ
ρ
’
E
h
E
0
ρ
ρ
Connection instructions.
(1) Level measurement in an open tank.
The low pressure side is at atmospheric pressure.
The formulae for the calculation of the level:
Zero =
ρ
E +
ρ
'h'
Scale =
ρ
(E + h) +
ρ
'h'
ρ
= specific weight of the fluid mechanism
ρ
'= specific weight of the filling liquid
for the capillaries of the
separators
(2) Level measurement in a closed tank.
With reference column
Connect the high pressure side of
the transmitter to the bottom of the
tank and the low pressure side to the
take-off pipe from the top of tank.
The formulae for the calculation of
the level:
Zero =
ρ.
E -
ρ
0
.(E + h)
Scale (∆P) =
ρ.
h
Ρ
= specific weight of the fluid
mechanism.
ρ
0
= specific weight of the liquid filling the reference column.
Note: formulas valid if the two separators are at the same height.
min level
Low
pressure
High
pressure
max level
