IM 01C25F01-01E
7-2
7. 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)
F0703.EPS
Figure 7.3
Integral Indicator Displaying 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 8.5.3 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
• Integral indicator display
• Software damping (optional)
Other parameters like following are shipped with the
default setting.
• Low-cut
• Process alarm setting
• Signal characterizer
• Write protection
To confirm or change the values, see IM 01C25T01-
01E or 01C25T03-01E.
7.2 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
NOT been disabled by a parameter setting.
To check the output signal, use a digital multimeter,
calibrator, or communicator.
F0704.EPS
Zero-adjustment
screw cover
Figure 7.4
External Zero-adjustment Screw
The zero-adjustment screw is located inside the cover.
(1) When you can obtain the Low Range
Value from the actual measured value of
0% (0 kPa, atmospheric pressure);
For pressure measurement using gauge pressure
transmitters, follow the steps below before performing
zero point adjustment.
1) Close the tap valve (main valve).
2) Loosen the fill plug so that the pressure applied to
the transmitter is only the head of the seal liquid.
3) Adjust the zero point at this status.
4) After the adjustment, close the fill plug and then
gradually open the tap valve.
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. Since the degree of the zero
adjustment varies with the screw turning speed, turn
the screw slowly to make a fine adjustment and
quickly to make a rough adjustment.
