Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer - Manual (Page 67)

IM 12J05C01-01E
2-2 Appendix
2/3
QIS 12J05C01-01E
(2) Setting Password 070.
a. Press the [>] key once. The data display will show “000” with the second digit of 0
flashing.
b. Press the [ š ] key seven times. The data display will show “070” with the second digit of
7 flashing.
c. Press the [ENT] key. The message display will show “HIF.”
d. Press the [YES] key.
(3) Confirming the date and time.
a. Press the [ENT] key. The data display will show the date in day, month, year format.
b. Press the [ENT] key. The data display will show the time in hour, minute, second format.
c. Press the [ENT] key. The message display will show “mA.”
This is the inspection mode. When the message display shows “mA,” check the current outputs.
Each time the [ENT] key is pressed, the value on the data display increase in steps of 4.0 like
“4.0,” and “8.0.” Check the current outputs. Corresponding to the data display, the current
output must be within the range shown in Table 1.
Table 1
Data Display Current Output (mA DC)
4.0 4 ±0.02
12.0 12 ±0.02
20.0 20 ±0.02
3.3 Temperature Indication Check
Following Section 3.2, press the [ENT] key until the message display shows “22kNTC.” in this
state, change the resistance of the decade resistance box and check the data display. The
value on the data display must be within the range shown in Table 2.
Table 2
Temperature (°C) Decade Box Resistance (:) Data Display (°C)
-9 99.6k -9 ±0.3
25 22k 25 ±0.3
140 653.8 140 ±0.3
3.4 Galvanic Indication Check
Following Section 3.3, press the [ENT] key until the message display shows “GALVA.” Then
turn SW1 on. Change the current of the DC generator 1 and check the data display. The value
on the data display must be within the range shown in Table 3.
Table 3
Reference (μA) Data Display (μA)
10 10 ±0.06
30 30 ±0.1
50 50 ±0.2
3.5 Polarograph Indication Check
Press the [ENT] key until the message display shows “POLAR.1.” Then turn SW1 off. Change
the current of the DC generator 2 and check the data display. The value on the data display
must be within the range shown in Table 4.