IM 01C25R01-01E
8-2
8. OPERATION
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)
F0802E.EPS
Figure 8.2
Integral Indicator with Error Code
NOTE
If any of the above errors are indicated on the
display of the integral indicator or the communi-
cator, refer to subsection 9.5.2 for the corrective
action.
Verify and Change Transmitter Parameter
Setting and Values
The parameters related to the following items are set at
factory as specified in order.
• Calibration range
• Software damping (optional)
Other parameters like following are shipped with the
default setting.
• Low-cut
• Process alarm setting
• Write protection
To confirm or change the values, see IM 01C25T01-
01E or 01C25T03-01E.
8.2 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 adjust-
ment. Powering off within 30 seconds of per-
forming 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
been enabled by a parameter setting.
External zero adjustment function only to the
differencial pressure signal.
To check the output signal, use a digital multimeter,
calibrator, or communicator.
8.2.1 Adjusting Zero Point for Differential
Pressure
Before adjusting zero point, make sure that the equaliz-
ing valve is open.
F0803E.EPS
Zero-adjustment
screw cover
Figure 8.3
External Zero Adjustment Screw
The zero-adjustment screw is located inside the cover.
Use a slotted screwdriver to turn the zero-adjustment
screw. Equalize the transmitter, then 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.
