Yokogawa EJA438 - Manual (Page 41)

IM 1C22J1-01E 7-12
7. BRAIN TERMINAL BT200 OPERATION
(10) Range Change while Applying Actual
Inputs (H10: AUTO LRV, H11: AUTO
HRV)
This feature allows the lower and higher range values
to be set up automatically with the actual input
applied. If the lower and higher range values are set,
C21: LOW RANGE and C22: HIGH RANGE are
changed at this same time.
Follow the procedure in the figure below.
The measurement span is determined by the higher
and lower range values. Changing the lower range
value results in the higher range value changing auto-
matically, keeping the span constant.
• Example 1: When changing the lower range
value to 0.5 kPa for the present
setting of 0 to 30 kPa, take the
following action with input pressure
of 0.5 kPa applied.
FEED NO OK
SET
H10:AUTO LRV
0.5000 kPa
DATA DIAG PRNT ESC
PARAM
H10:AUTO LRV
0.5000 kPa
H11:AUTO HRV
30.500 kPa
H60:SELF CHEC
GOOD
ESC
SET
H10:AUTO LRV
0 kPa
+ 0
F0726.EPS
The higher range value is changed
keeping the span constant.
Parameters C21 and C22 are
changed at the same time.
Press the key twice.
The lower range value is changed
to 0.5 kPa.
Press the (OK) key.
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.
FEED NO OK
SET
H11:AUTO HRV
10.000 kPa
DATA DIAG PRNT ESC
PARAM
H10:AUTO LRV
0 kPa
H11:AUTO HRV
10.000 kPa
H60:SELF CHECK
GOOD
ESC
SET
H10:AUTO HRV
30 kPa
+ 30
The lower range value is not
changed, so the span changes.
Parameter C22 is changed at the
same time.
Press the key twice.
The higher range value is changed
to 10 kPa.
Press the (OK) key.
F0727.EPS
(11) 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 Description
Using the BT200 Set the present input to 0%.
Using the external
zero-adjustment
screw Adjust zero point using the zero-
adjustment screw on the transmitter.
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.
Adjust output to the reference value
obtained using other means.
Adjust for 0% output at input level of
0%.
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.
T0709.EPS