Yokogawa EJX118A - Manual (Page 32)

<6. Operation>
6-2
IM 01C25H01-01E
Using the integral indicator
• If the wiring system is faulty, the display stays
blank.
• If the transmitter is faulty, an error code is
displayed.
Self-diagnostic error on the integral indicator
(Faulty transmitter)
F0604.ai
NOTE
If any of the above errors are indicated on
the display of the integral indicator or the
communicator, refer to subsection 7.5.3 for
corrective action.
■ Verify and Change Transmitter Parameter
Setting and Values
The parameters related to the following items are
set at factory as specified by the customer.
• Calibration range
• Integral indicator display
• Output mode
• Software damping (optional)
Other parameters like following are shipped with the
default setting.
• Low-cut
• Process alarm setting
• Static pressure range
• Signal characterizer
• Write protection
To confirm or change the values, see IM 01C25T01-
06EN or 01C25T03-01E.
6.2 Zero Point Adjustment
After completing preparations for operating the
transmitter, adjust the zero point.
Zero point adjustment can be done by turning the
transmitter’s zero-adjustment screw or by using
the communicator. This section describes the
procedure for the zero-adjustment screw. For the
communicator procedure, see the communication
manual.
IMPORTANT
Do not turn off the power to the transmitter
immediately after performing a zero point
adjustment. Powering off within 30 seconds of
performing this procedure will return the zero
point to its previous setting.
NOTE
Before performing this adjustment, make sure
that the external zero adjustment function has
NOT been disabled by a parameter setting.
To check the output signal, use a digital multimeter,
calibrator, or communicator.
(1) When you can obtain the Low Range Value
from the actual measured value of 0%
(0 kPa, atmospheric pressure);
Zero-adjustment
screw cover
F0605.ai
The zero-adjustment screw is located inside the
cover.
Use a slotted screwdriver to turn the zero-
adjustment screw. Turn the screw clockwise
to increase the output or counterclockwise to
decrease the output. The zero point adjustment can
be made with a resolution of 0.01% of the setting
range. The degree of zero adjustments varies with
the screw turning speed; turn the screw slowly to
make a fine adjustment, quickly to make a rough
adjustment.
When adjusting the transmitter zero point, the
liquid level in a tank does not have to be set to
the low limit (0%) of the measuring range; use a
digital manometer or a glass gauge to match the
transmitter output signal with the actual measured
value.