Yokogawa EJA440E - Manual (Page 25)

<3. Operation>
3-17
IM 01C25T03-01E
c. Sensor Trim for Static Pressure
(J21: SP ZERO ADJ, J22: SP SPAN ADJ,
J25: SP ZERO DEV, J26: SP SPAN DEV)
For the transmitters (Except for EJX120A/EJA120E),
zeroing and full sensor trim of the static pressure
is performed in the same way as with the primary
process variable (PV). Note that the static pressure
sensor trim should be done only after trimming
the PV.
d. Reset Trim Adjustment to Factory Setting
(J56: CLEAR ADJ)
Use PRES or SP of J56: CLEAR ADJ parameter
to reset the trim adjustment to the initial calibrated
values that were set. When PRES is selected to
clear the adjustment, the amount of the adjustment
by the external zero-adjustment screw is returned to
the initial setting as well.
• Example: Reset the trim adjustment of pressure
to factory set characterization curve.
ESC
SET
J56:CLEAR ADJ
---
FEED NO OK
Use the or key
to select
PRES.
Press the key twice to
enter the setting.
Press the (OK) key.
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SET
J56:CLEAR ADJ
---
< --- >
< PRES >
< SP >
< 4-20mA >
(16) Test Output Setup
(K10: OUTPUT X %)
This feature can be used to output a fixed current
for loop checks. The available range for test output
depends on the setting at parameters D20: OUT
LIMIT (L) and D21: OUT LIMIT (H), whose limit is
from 3.6 mA (–2.5%) to 21.6 mA (110%).
• Example: Output 12 mA (50%) fixed current.
CLR ESC
SET
K10:OUTPUT X %
50.00% ACTIVE
FEED NO OK
SET
K10:OUTPUT X %
0.00 %
+ 050.00
Set 50.00%.
Press the key twice to
output a fixed current at 50%.
ACTIVE is displayed while this is
being executed.
Press the (OK) key to cancel
the fixed current output.
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NOTE
• Fixed current output and DO Test continue
for a given holding time, then is released
automatically. Even if the BT200 power
supply is turned off or the communication
cable is disconnected, the test output will
continue for that time.
The holding time can be selected from 10
min*, 30 min, 60 min, 3 hour, 6 hour or 12
hour by the parameter K45: TEST TIME.
*: Default value.
• Press the (OK) key to release test output
immediately.
(17) Signal Characterizer
This function is used to compensate the output
for non-linear applications. The characterized
values are applied to the 4-20 mA output. For
the measured pressure, a maximum of nine
coordinates can be specified between 0-100%.
Perform the coordinate settings while the T10: S. C.
ENABLE parameter is INHIBIT.
To apply the settings to the output, set the T10: S.
C. ENABLE parameter to ENABLE.
Note that the transmitter rejects the activation of the
function by AL. 60 with the following transmitter’s
status:
• When the specified coordinates of x and y are
not incremental as the input increases.
• When the output mode of the output signal is
set as SQUARE ROOT; at the same time, the
low cut mode is set to LINEAR.
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Y
X 100% 0%
100%
INPUT OUTPUT
Input pressure in % Characterized value