Yokogawa EJX440A - Manual (Page 25)

IM 01C25T03-01E 3-17
3. OPERATION
c. Sensor Trim for Static Pressure
(J21: SP ZERO ADJ, J22: SP SPAN ADJ,
J25: SP ZERO DEV, J26: SP SPAN DEV)
For the EJX differential transmitters (Except for
EJX120A), 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 trim-
ming 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.
F0353.EPS
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 of 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.
F0336.EPS
IMPORTANT
1. Test output continues for approximately 10
minutes, then is released automatically. Even if
the BT200 power supply is turned off or the
communication cable is disconnected, test
output will continue for approximately 10
minutes.
2. 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 EJX 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 .