Zero Point Adjustment - YOKOGAWA Dpharp vigilantplant EJA110A User Manual

Note that changing the higher range value does not
cause the lower range value to change but does change
the span.
• Example 2: When the higher range value is to
be changed to 10 kPa with the
present setting of 0 to 30 kPa, take
the following action with an input
pressure of 10 kPa applied.
SET
H11:AUTO HRV
30 kPa
+ 30
ESC
SET
H11:AUTO HRV
10.000 kPa
FEED NO OK
PARAM
H10:AUTO LRV
0 kPa
H11:AUTO HRV
10.000 kPa
H60:SELF CHECK
GOOD
DATA DIAG PRNT ESC
(15)

Zero Point Adjustment

(J10: ZERO ADJ, J11: ZERO DEV,
J20: EXT ZERO ADJ)
The DPharp supports several adjustment methods.
Select the method best suited for the conditions of your
application.
Note that output signal can be checked by displaying
parameter A10:OUTPUT (%) on the BT200.
Adjustment Method
Using the BT200 Set the present input to 0%.
Adjust for 0% output at input level of
0%.
Adjust output to the reference value
obtained using other means.
If the input level cannot easily be
made 0% (because of tank level,
etc.), adjust output to the reference
value obtained using other means,
such as a sight glass.
Using the external Adjust zero point using the zero-
zero-adjustment adjustment screw on the transmitter.
screw This permits zero adjustment without
using the BT200. Accurately adjust
the output current to 4 mA DC or
other target output value using an
ammeter that accuratly reads output
currents.
Press the key twice.
The higher range value is changed
to 10 kPa.
Press the (OK) key.
The lower range value is not
changed, so the span changes.
Parameter C22 is changed at the
same time.
Description
(a) Follow the procedure below when setting the
present output to 0% (4 mA).
A10:OUTPUT (%)
0.5 %
SET
J10:ZERO ADJ
0.0 %
+ 000.0
SET
J10:ZERO ADJ
0.0 %
FEED
A10:OUTPUT (%)
0.0 %
(b) In tank level measurement, if the actual level
cannot be brought to zero for zero adjustment, then
the output can be adjusted to correspond to the
actual level obtained using another measuring
F0832.EPS
instrument such as a glass gauge.
Present level: 45%
Present output: 41%
EJA
(b)-1 Follow the procedure below to use J10: ZERO
ADJ.
A10:OUTPUT (%)
41.0 %
SET
J10:ZERO ADJ
0.0 %
+ 040.0
A10:OUTPUT (%)
40.0 %
T0810.EPS
8-14
8. BRAIN TERMINAL BT200 OPERATION
Output is 0.5%.
Press the
CLR ESC
Zero adjustment is completed.
Press the (OK) key.
NO OK
Output is 0%.
Present output is 41.0%.
Enter the present actual level, 40%.
Press the
CLR ESC
The output is changed to 40%.
key twice.
F0833.EPS
100%
Present level
45%
0%
F0834.EPS
key twice.
F0835.EPS
IM 01C21B01-01E