25
TN4FCXA2
j
-EDF-
E
2- 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.
H
1
Scale (∆P) =
ρ
(H
1
+ h)
ρ
= specific weight
H
1
= Height between the axis
of the transmitter flange
and the min. level
h = level variation (max-min)
Installation precautions
• H
1
must be greater than half the diameter of the measurement membrane of the transmitter
flange. If this is not the case, the measure would not be proportional to the level as long
as the membrane is not totally immersed.
• Do not scratch, nor cause shocks on the measurement membrane, as this would definitively
damage the transmitter.
• Do not excessively tighten the bolts of the flange mechanism (observe the tightening
torques recommended by the applicable piping standards).
Protection against freezing.
If there is a risk of the fluid mechanism freezing, the transmitter and connecting pipes must be
equipped with a heater, as well as a steam or electrical tracer. Do not exceed the limits of the
intended temperatures (measuring cell 120° max, transmitter 85°C). Even if the installation
stops, the heating should be maintained, otherwise the transmitter and connecting pipes must
be drained to prevent freezing.
H
1
ρ
h
isolating valve
min level
max level
