Yokogawa EJX115A - Manual (Page 15)

<3. Operation>
3-7
IM 01C25T03-01E
b. Setting Calibration Range Lower Range
Value and Upper Range Value
(C21: PRES LRV, C22: PRES URV)
These range values are set as specified in the
order before the instrument is shipped. Follow the
procedure below to change the range.
• The measurement span is determined by the
upper and lower range limit values. In this
instrument, changing the lower range value also
automatically changes the upper range value,
keeping the span constant.
• Example 1: With present settings of 0 to 30 kPa,
set the lower range value to 0.5 kPa.
Span = Upper range value – Lower range value
FEED NO OK
SET
C21:PRES LRV
0.5 kPa
DATA DIAG PRNT ESC
PARAM
C20:PRES UNIT
kPa
C21:PRES LRV
0.5 kPa
C22:PRES URV
30.5 kPa
DEL CLR ESC
SET
C21:PRES LRV
0 kPa
+ 0.5
The upper range value is changed
while the span remains constant.
Set 0.5.
Press the key twice to
enter the setting.
Press the (OK) key.
F0313.ai
• Entering the range values as LRV>URV
reverses the direction of the output signal
of 4-20 mA to 20-4 mA corresponding to the
calibration range of 0 to 100%.
• Calibration range can be specified with range
value specifications up to 5 digits (excluding
any decimal point) for lower or upper range
limits within the range of –32000 to 32000.
• Note, however, that changing the upper range
value does not cause the lower range value to
change. Thus, changing the upper range value
also changes the span.
• Example 2: With present settings of 0 to 30 kPa,
set the upper range value to 10 kPa.
FEED NO OK
SET
C22:PRES URV
10 kPa
DATA DIAG PRNT ESC
PARAM
C20:PRES UNIT
kPa
C21:PRES LRV
0 kPa
C22:PRES URV
10 kPa
DEL CLR ESC
SET
C22:PRES URV
30 kPa
+ 10
The lower range value is not
changed, so the span changes.
Set 10.
Press the key twice
to enter the setting.
F0314.ai
Press the (OK) key.
(3) Damping Time Constant Setup
(C30: AMP DAMPING)
When the instrument is shipped, the damping time
constant is set at 2.00 seconds unless otherwise
specified in the order. Follow the procedure below
to change the damping time constant.
Note that setting the quick response parameter
(D50: QUICK RESP) ON enables you to set the
damping time constant between 0.00 to 0.49
second.
• Example: Change from 2.00 to 4.00 seconds.
ESC CLR
SET
C30:AMP DAMPING
4.00 sec
FEED NO OK
SET
C30:AMP DAMPING
2.00 sec
+ 004.00
Enter 4.
Press the key twice to
enter the setting.
F0315.ai
Press the (OK) key.
Note 1: The damping time constant set here is the time
constant for the amplifier assembly. The damping time
constant for the entire transmitter is the sum of the
values for the amplifier assembly and for the capsule
assembly.
Note 2: When the damping time constant is set to less than
0.5 second, communication may occasionally be
unavailble during the operation, especially while output
changes dynamically.