Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer User Manual
Page 77
IM 12J05C01-01E
2-12 Appendix
3/3
QIS 12J05C01-61E
i. Press
the
[ ] key. The instrument returns to the measurement mode.
Set the display to nA current indication by following the steps below.
a. Press the [MODE] key. The message display will show “CALIB.”
b. Press the [NO] key once. The message display will show “DISP.”
c. Press the [YES] key once. The message display will show temperature indication.
d. Press the [NO] key five times. The message display will show nA current indication.
Change the current of DC generator 2 as shown in Table 3. The corresponding indication must
be within the range.
Table 3
Reference (nA)
Data Display (nA)
200 200
±1
600 600
±3
1000
1000
±5
Press the [MODE] key to return to normal mode.
3.6 Fieldbus Communication Functional Check
Check for normal function using Fieldbus equipment specified by Yokogawa.
DO202
G
11
12
16
15
＋
13
+
14
17
SH
●
GALV SENS ●
●
POL SENS ●
18
－
+
-
+
-
Decade
Resistance
Box
DC
Generator
2
DC
Generator
1
SW1
Shorting Bar
DC
Source
24VDC
Fieldbus Equipment Specified by Yokogawa
C
R
C
R
R
R
C
C
R
L
L
R=50Ω±１Ω
C=2μF±0.4μF
L=5ｍH±5％
R
L
=50Ω±1％
SUPPLY
TEMP
+
–
+
–
Figure 1 Testing Circuit and Test Equipment