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TN4FCXA2
j
-EDF-
E
3.2
Adjustment of the measuring range
Prior to the adjustment of the measuring range, first check the “zero” setting. There is no interference
between the zero adjustment and the measuring range.
Each type of transmitter has its own maximum measuring range. The measuring range (20mA)
can be adjusted with the external screw located on the electronic control unit on the condition that
the switch (2 positions) is on “LOCAL” and the “Mode” switch
is in position “1” or “6”.
(1) Put the “Mode” switch to position “1” or “6”.
(2) Apply pressure corresponding to that of the measuring
range of the transmitter.
(3) Adjust the output signal to 20 mA with the external screw.
(4) Check the output signal corresponding to the zero by
applying the corresponding pressure and check that
the output signal is 4 mA.
(5) After the settings described under Sec. 3.2 - (1) to (4),
put the “Mode”switch in the appropriate position for your measurement.
The transmitter must be kept under voltage for 10 sec. so that the
parameters set are stored by the electronics.
4. Adjustment of the output signal damping
If the pressure variation to be measured entails a variation of the impulsive output signal, it
is recommended that the output signal be dampened. The damping is adjustable with the 7
positions of the “Damp” switch.
Additional time is added to the response time of the transmitter, through the position of the
“Damp” switch.
These added times can be adjusted to 0, 0.3, 0.6, 1.2, 2.4, 4.8, 9.6, 19.2 seconds without
influencing the setting of the measuring range.
The relationship between the position of the “Damp” switch and the damping time is indicated
in Table 2.
Note):
The damping is a time value added to the output signal and concerns only the electronics of
the transmitter. (See details in the technical specification)
After the damping time is set, the damping time of the system must be
adapted.
Check the compatibility of the 2 damping time settings.
5. Function for generation of current and adjustment of the 4/20 mA output signal.
The transmitter can provide an output signal of 4, 12 or 20 mA based on the position of the
“Mode” switch in position 3, 4 or 5.
The adjustment loop can be checked by this function. The adjustment of the output signal
(4/20 mA) can be performed if the “Mode” switch is in position 3 and 5.
INDICATION
INDICATION
Diminuer
Augmenter
Ajustement fin : Tourner doucement
(environ 5 sec par tour)
Ajustement approximatif : Tourner vite
(environ 1 sec par tour)
