28
TN4FCXA2
j
-EDF-
E
It is recommended that the pressure transmitter be installed below the
separators. If the pressure of the process is less than the atmospheric pressure,
this becomes indispensable (see next page).
The specific weight of the filling liquids can be obtained from Fuji Electric.
For information, the current values are the following
:
0
20
40
60
80
100
ρ
1
0
H
H
0
H
0
20
40
60
80
100
0
H
T
0
20
40
60
80
100
0
H
T
ρ
0
Precautions to be taken in the case of measurement under vacuum.
When the pressure of the process is close to a vacuum, the transmitter must
always be installed below the lowest pressure take-off pipe, as indicated
in Fig.1.
If the installation is performed according to Fig. 2 or 3, an additional negative
pressure is created by the height H
0
of the filling l iquid o f t he capillaries
located between the transmitter and the lower pressure take-off pipe. In this
case, it is essential to check that the resulting pressure on the measuring
cell of the sender is greater than the minimum service pressure indicated in
the technical specifications of the transmitter used.
In case of doubt, consult Fuji Electric France.
Installation precautions
• Vibrations on the capillaries can create interference with the measurement and distort it. It
is therefore advisable to install the transmitter on a vibration
free bracket and to attach the
capillaries to stable structures.
• Avoid channeling the capillaries on the high pressure side and low pressure side to places
where the temperature or the sunshine are very different, because this creates zero drifts.
If this cannot be avoided, it is advisable to have a heater cable running along the capillaries
to maintain a constant temperature.
1
2
3
Filling fluid
Density
General
Silicone oil
0.934
A
pplications
High temperature, high temperature
1.07
and use in vacuum, high temperature and
use in absolute vacuum
Fluoridated oil
1.84
Oxygen measurement
INTERDICTION
INTERDICTION
