IM 01C25C01-01E
7-2
7. OPERATION
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-
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.
(1) When you can obtain Low Range Value
from actual measured value of 0% (0 kPa,
atmospheric pressure);
F0704.EPS
Zero-adjustment
screw cover
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 adjust-
ments 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.
(2) When you cannot obtain Low Range Value
from actual measured value of 0%;
Adjust the transmitter output to the actual measured
value obtained by a digital manometer or a glass
gauge.
[Example]
The measuring range of 50 to 250 kPa; the actual
measured value of 130 kPa.
130–50
250–50
Actual measured value=
x 100=40.0%
(=10.4mA)
Turn the screw to match the output signal to the actual
measured value.
