Yokogawa EJA310A - Manual (Page 46)

IM 01C21D01-01E 8-13
8. BRAIN TERMINAL BT200 OPERATION
(a) Follow the procedure below when setting the
present output to 0% (4 mA).
FEED NO OK
SET
J10:ZERO ADJ
0.0 %
CLR ESC
SET
J10:ZERO ADJ
0.0 %
+ 000.0 Press the key twice.
Zero adjustment is completed.
Press the (OK) key.
F0828.EPS
Output is 0.5%.
A10:OUTPUT (%)
0.5 %
Output is 0%.
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
instrument such as a glass gauge.
[Example]
Measurement range: 50 to 250 kPa, Actual value:
130 kPa.
Actual value
Actual
value(%)
x 100
130–50
250–50
= x 100=40.0%
–Measurement range lower range value
Measurement range higher range value
–Measurement range lower range value
=
(b)-1 Follow the procedure below to use J10: ZERO
ADJ.
CLR ESC
SET
J10:ZERO ADJ
0.0 %
+ 040.0 Enter the present actual level, 40%.
Press the key twice.
The output is changed to 40%.
F0829.EPS
Present output is 41.0%.
A10:OUTPUT (%)
41.0 %
A10:OUTPUT (%)
40.0 %
(b)-2 Follow the procedure below to use J11: ZERO
DEV.
ECS
ESC
SET
J11:ZERO DEV.
2.50 %
0 Since “J11: ZERO DEV.” contains
the previous correction, obtain the
correction value by adding –1.0% to
it. 2.50% + (–1.0%) = 1.50%
Set the correction value, 1.50.
Press the key twice.
F0830.EPS
Present output is 41.0%.
Output error = 40.0 – 41.0 = –1.0%.
A10:OUTPUT (%)
41.0 %
The output is changed to 40%.
A10:OUTPUT (%)
40.0 %
SET
J11:ZERO DEV.
2.50 %
1.50
When the zero point is adjusted, the displayed value
of A40 is as follows.
[Example]
When the zero point is shifted by 20 kPa for the
actual pressure, the parameter of A40 indicates 50
kPa.
F0839.EPS
70 kPa
20 kPa
0 kPa
Zero adjustment
volume(J11)
Actual differential
pressure/pressure Input value
of A40
50 kPa
0 kPa
Zero
adjustment