Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer - Manual (Page 66)

IM 12J05C01-01E
Appendix 2-1
APPENDIX 2. QUALITY INSPECTION
A-2-1. DO202G 2-Wire Dissolved Oxygen Transmitter
Quality
Inspection
Standards
DO202G
Dissolved Oxygen Transmitter
QIS 12J05C01-01E
1st Edition: Feb. 2007
1. Scope
This inspection standard applies to the DO202G Dissolved Oxygen Transmitter.
2. Inspection Items
2.1 Insulation resistance test
2.2 Current output test
2.3 Temperature indication check
* 2.4 Galvanic indication check
* 2.5 Polarograph indication check
Note: Items marked with an asterisk (*) may only be confirmed by a test certificate.
3. Inspection Methods, Standards and Conditions
z
Connect the testing circuit as shown in Figure 1. Allow the instrument to warm up for at least
5 minutes before conducting the tests. For the connections for the insulation resistance test,
follow the instructions in Section 3.1.
z
Performance tests should be done in the inspection mode where the tests from Section 3.2
through Section 3.5 take place in sequence and cannot be retraced. If the reconfirmation of
a test is needed, turn off the power to the transmitter, turn on the power again, and enter the
inspection mode to restart the tests.
3.1 Insulation Resistance Test
(1) Apply 500 V DC between the power supply terminals shorted together (+ and –) and the
earth terminal (G). The insulation resistance must be 100 MΩ or greater.
(2) Apply 500 V DC between the input terminals shorted together (11 to 18) and the earth
terminal (G). The insulation resistance must be 100 MΩ or greater.
3.2 Current Output Test
Connect the testing circuit as shown Figure 1 and set the equipment as follows:
Decade resistance box: 1019.5 [Ω]
DC generator 1: 0 μA
DC generator 2: 0 μA
DC source: 24 V DC
User the following procedure to enter the inspection mode.
(1) Entering Service Code 87.
a. Press the [
] key. The message display will show “
OUTP.”
b. Press the [NO] key twice. The message display will show “
SERV.”
c. Press the [YES] key. The data display will show “00” with the first digit of 0 flashing.
d. Press the [ š ] key eight times. The data display will show “80” with the first digit of 8
flashing.
e. Press the [>] key once. The data display will show “80” with the second digit of 0
flashing.
f. Press the [ š ] key seven times. The data display will show “87” with the second digit of 7
flashing.
g. Press the [ENT] key. The message display will show “
PASS
.”