9
TN4FCXA2
j
-EDF-
E
EEPROM
Paramétrage
du capteur
Convertisseur
Analogique/
Numérique
Convertisseur
Numérique/
analogique
Micro Processeur
• Traitement du signal
• Réalignement
• Diagnostics
• Communication
EEPROM
Données
transmetteur
Communication
FUJI/HART
®
Réglage manuel
Zéro/Echelle
(ne pas utiliser en CNPE)
25.0
8.00 kPa
FXW
0 Y
1
4
7
8
9
6
5
2
3
M
N
O
S
R
Q
U
V
W
Z
.
[
HHC
Hand held Communicator
{
HP
BP
Système de
commande
Indicateur analogique
(option)
Signal 4-20 mA
Indicateur numérique
configurable
(option)
Cellule capacitive silicium (flottante)
Unité cellule
Unité électronique
DESCRIPTION
1
The pressure transmitters of the FCX-AII series measure differential, effective or absolute pressure,
and convert it into a directly proportional output signal of 4 to 20 mA. This transmitter can be
used for the measurement of flow, fluid level, density or any other application using the principle
of differential pressure measurement.
The measurement principle of this transmitter is based on the direct conversion of a differential
pressure into a variation of the two capabilities.
The transmitter is compact and lightweight, thus offering a high precision and high reliability.
Local zero setting possible by means of external screw on electronic unit. The smart transmitters
can also be adjusted or configured remotely. For example, the measurement range and the
damping can be configured from the control room using a mobile HHC (hand held communicator).
However, zero adjustment may only be done in nuclear power plants with the aid of an
FXW mobile communicator.
Measurement principle
The operating principle of the differential pressure transmitter is shown in the diagram below.
The differential pressure is applied on the separation membranes and transmitted to the capacitive
micro-pressure transmitter , which converts it into a capacitance difference (MEASURING CELL).
The electronic unit has microprocessor and receives a digital signal from the unit cell that it
converts it to an analogue output signal 4 - 20 mA, and a superimposed digital signal.
The digital signal is compatible with both the Fuji and HART
®
communications protocols. The
transmitter automatically recognises the protocol used and responds to the connected device
using the appropriate protocol.
