<3. Parameter Setting>
3-14
IM 01C25T01-06EN
3.2.5 Damping Time Constant Setup
The damping time constant is set as specified in
the order when the instrument is shipped. Follow
the procedure below to change the damping
time constant. The damping time constant for the
amplifier assembly can be set here. The damping
time constant for the entire transmitter is the sum
of the values for the amplifier assembly and the
capsule assembly.
Any number from 0.00 to 100.00 can be set for the
damping time constant. Note that setting the quick
response parameter ON enables you to set the time
constant between 0.00 and 0.49 seconds.
NOTE
When using the HART communication in such
application that the output varies very quickly, set
the damping time constant as 0.5 sec or greater.
• Procedure to call up the
Pres Damp
display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu]
→ Basic setup →
Pres Damp
EJX_HART 5[1.2]
DTM
Easy Setup → Pres Damp or
Configuration → Analog Output →
Pres Damp
• Procedure to call up the
Quick resp
display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu]
→ Detailed setup →
Signal condition → Quick resp →
EJX_HART 5[1.2]
DTM
Configuration → Analog Output →
Quick resp →
→ Off
Set from 0.50 to 100.00
→ On
Set from 0.00 to 100.00
3.2.6 Output Signal Low Cut Mode Setup
Low cut mode can be used to stabilize the output
signal near the zero point.
The low cut point can be set in a range from 0 to
20%, the direct ratio corresponding to the output
signal of 4 to 20 mA or 1 to 5 V. (Hysteresis for the
cut point: ±10% of the cut point)
Either “Linear” or “Zero” can be selected as the low
cut mode. Unless otherwise specified, the cut mode
is set to “Linear” at the factory.
The default value of Low cut is set according to the
combination of the Output mode (Xfer fnctn) and
Integral indicator display mode (Disp Pres % fnctn).
See below table.
Relationship of default value of Low cut and
Low cut point
Combination of
output mode and
display mode
Default
value of
Low cut
Low cut
point for
the output
signal/
display
# Output
mode
Display
mode
1) Linear
Linear
10%
10% / 10%
2) Sq Root Sq Root
10%
10% / 10%
3) Linear Sq Root
1%*
1% / 10%
4) Sq Root Linear
10%
10% / NA
*: It is applied for software revision 2.02 or later. For
previous software version, it is set in 10%.
In the case 3) above, Low cut point for the display is
square root of Low cut value.
(Example: Low cut value; 2%, Low cut point; 14%)
Note that when the output modes of the output
signal and the display are selected as “Sq root”
and “Linear” accordingly, the low cut function is not
available for the display value.
(%)
50
(%)
50
0
50
(%)
50
(%)
Output
Output
For low cut in linear mode
Input
20
20
0
For low cut in zero mode
Input
F0302.ai
Example: Low cut at 20%
Figure 3.1
Low Cut Mode
• Procedure to call up the display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu]
→ Basic setup →
EJX_HART 5[1.2]
DTM
Easy Setup → or Configuration →
Analog Output →
→ Low cut
Set from 0 to 20% of output
→ Low cut mode
Select “Linear” or “Zero”
The low cut point has hysteresis so that the output
around the point is behaved as below figure.
