Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer - 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