<3. Operation>
3-16
IM 01C25T03-01E
a-3. Using External Zero-adjustment Screw
This method permits zero adjustment without the
BT200. Use a slotted screwdriver to turn the zero-
adjustment screw. See the hardware manual for
details.
Note that the parameter J55: EXT ZERO ADJ must
be
ENABLE
to perform this adjustment.
Follow the procedure below to enable or inhibit zero
point adjustment from the zero-adjustment screw
on the transmitter.
This is set to
ENABLE
when the instrument is
shipped.
• Example: Inhibiting zero adjustment by the
external zero-adjustment screw.
ESC
SET
J55:EXT ZERO ADJ
ENABLE
< ENABLE >
< INHIBIT>
Use the or key
to select
INHIBIT
.
Press the key twice to
enter the setting.
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Then press the (OK) key.
b. Full Sensor Trim (J11: P ZERO ADJ, J12: P
SPAN ADJ, J15: P ZERO DEV, J16: P SPAN
DEV)
Full sensor trim is carried out with a series of the
procedure of J11: P ZERO ADJ and J12: P SPAN
ADJ. Also, you can manually perform the trimming
procedure by using J15: P ZERO DEV and J16: P
SPAN DEV.
The full sensor trim is a two-point adjustment,
and the lower point adjustment should always be
performed before the upper point adjustment in
order to maintain the pitch between the zero and
100% points within the calibration range.
In the manual method, the reference pressure
should also be applied to the transmitter at both
lower and upper point of trim ends. Without the
reference pressure, J15: P ZERO DEV and J16: P
SPAN DEV may not represent the correct value of
adjustment point for each.
b-1. Auto Sensor Trim
• Example: For the range of 10 to 30 kPa.
FEED
NO
OK
SET
J11:P ZERO ADJ
10.0000 kPa
ESC
CLR
DEL
ESC
CLR
DEL
SET
J11:P ZERO ADJ
9.94000 kPa
+ 10
Set
10
.
After obtaining a stable pressure
of 10 kPa, press key
twice.
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Press the (OK) key.
ESC
SET
J10:ADJ PRES
9.94000 kPa
Transmitter indicates 9.94 kPa as
its output when applying a
standard pressure of 10 kPa.
ESC
SET
J10:ADJ PRES
30.1500 kPa
Transmitter indicates 30.15 kPa
as its output when applying a
standard pressure of 30 kPa.
ESC
SET
J10:ADJ PRES
10.0000 kPa
Check the output becomes 10 kPa.
ESC
SET
J10:ADJ PRES
30.0000 kPa
Check the output becomes 30 kPa.
FEED
NO
OK
SET
J12:P SPAN ADJ
30.0000 kPa
Press the (OK) key.
Set
30
.
After obtaining a stable pressure
of 30 kPa, press key
twice.
SET
J12:P SPAN ADJ
30.1500 kPa
+ 30
Setting a lower point
Setting an upper point
