Yokogawa DO402 Dissolved Oxygen Analyzer - Manual (Page 89)

IM 12J05D02-01E
Appendix 2 11-1
11. APPENDIX 2 QUALITY INSPECTION
Quality
Inspection
Standards
DO402G
Dissolved Oxygen Converter
QIS 12J05D02-01E
1st Edition: Sep. 1998
7th Edition: Sep. 2013
1. Scope
This inspection standard applies to the DO402G Dissolved Oxygen Converter.
2. Inspection Items
2.1 Insulation resistance test
* 2.2 Dielectric strength test
2.3 Current output test
2.4 Contact operation test
2.5 Temperature indication check
* 2.6 Input current indication check
2.7 Atmospheric pressure indication check
Note: Items marked with an asterisk (*) may only be confirmed by a test certificate.
3. Inspection Methods, Standards and Conditions

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 Sections 3.1 and for the dielectric strength
test, follow the instructions in Section 3.2.

Performance tests should be done in the inspection mode where the tests from
Section 3.3 through Section 3.7 take place in sequence and cannot be retraced. If the
reconfirmation of a test is needed, turn off the power to the converter, turn on the
power again, and enter the inspection mode to restart the tests.
3.1 Insulation Resistance Test
Apply 500 V DC between the power supply terminals shorted together (1 and 2) and the
protective earth terminal outside of the case. The insulation resistance must be 100 MΩ
or greater.
3.2 Dielectric Strength Test
Apply 1400 V AC, an AC voltage of substantially sinusoidal waveform with a frequency of
50 Hz or 60 Hz, between the power terminals shorted together (1 and 2) and the
protective earth terminal outside of the case, for at least 2 seconds. The insulation must
withstand this voltage. (The sensed current should be 15 mA.)
3.3 Current Output Test
Use the following procedure to enter the inspection mode.
(1) Entering Service Code 87
a. Press the [] key. The message display will show “SETP.”
b. Press the [NO] key four times. 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 [] 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.