Yokogawa EJA115 - Manual (Page 15)

IM 01C22T01-01E 2-8
2. HART COMMUNICATOR OPERATION
NOTE
It is possible to set LRV
Ͼ
URV. This setting
reverses the 4 to 20 mA output signal.
Conditions:
LSL Յ LRV Յ USL
LSL
Յ
URV
Յ
USL
|URV
Ϫ
LRV|
Ն
Min. Span
The 4 to 20 mA output does not correspond to
the scale of the indicator under the following
conditions in which;
• the equipment with standard specification is
used with the setting changed to the above
setting.
• the customer specified equipment (with the
above factory-setting) is used with the setting
changed to the normal (standard) setting.
In the cases above, replace the scale with one
which corresponds correctly to the 4 to 20 mA.
(b) Changing the Ranges While Applying an
Actual Input — Apply values
This feature allows the lower and upper range values to
be setup automatically with the actual input applied. If
the upper and lower range values are set, “
URV ” and
“ LRV ” are changed at the same time.
The measurement span is determined by the upper and
lower range valves. Changing the lower range value
results in the upper range value change automatically,
keeping the span constant.
1
F0213.EPS
Press OK (F4).
Call up the Apply Values display.
EJA:
WARN-Loop should be
removed from
automatic control
DEL SET ABORT OK
EJA:
Set the:
1 4mA
2 20mA
3 Exit
HELP SAVE ABORT ENTER
2
To set the lower range value, select
4mA and press ENTER (F4).
EJA:
Apply new 4ma input
HELP DEL ABORT OK
3
Apply the pressure of 500mmH
2
O.
After obtaining a stable pressure,
press OK (F4).
(ENTER)
(OK)
(OK)
1. Device setup
3. Basic setup
3. Re-range
2. Apply values
Example: To change the range from 0 to 2500 mmH
2
O to
500 to 3000 mmH
2
O
F02131.EPS
EJA:
Current applied
process value:
500.01 mmH2O
1 Set as 4mA value
2 Read new value
3 Leave as found
DEL ABORT
4
The LRV to be changed is 500.01
mmH
2
O.
• Selecting item 1 sets LRV to
500.01 mmH
2
O.
• Selecting item 2 reads LRV again.
To set LRV = 500.01, select item 1
and press ENTER (F4).
HELP SEND ENTER
(ENTER)
EJA:
Set the
1 4mA
2 20mA
3 Exit
HELP ABORT
5
Select Exit and press ENTER (F4).
Check the value after completing
the range change with URV and
LRV.
* The span is maintained the same
as when changing LRV with Apply
values. In this case, if LRV is
changed from 0 to 500, URV is
changed automatically to 3000.
DEL ENTER
× 2
(ENTER)
(4) Output Mode (Linear/Sq root)
The output mode has already been set to a Linear
output (
Linear ). Follow the procedure below to
change the mode.
1
F0214.EPS
Call up the Xfer fnctn display.
EJA:
Transfer function
Linear
Linear
Sq root
DEL SET ESC ENTER
[1] Select Sq root, and press
ENTER (F4).
[2] Press SEND (F2) to send the
data to the transmitter, then
check to confirm that
disappears.
(ENTER)
1. Device setup
3. Basic setup
5. Xfer fnctn
(SEND)
SEND
Example: To change the mode from Linear to Sq root.
The output mode is set as specified in the order when
the instrument is shipped.
If the instrument is equipped with an integral indicator
and Transfer function is sq root, “
” is displayed on
the integral indicator.