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Quality
Inspection
Standard
1. Introduction
This inspection procedure applies to the model DO402 microprocessor based converter. There is a serial
number, unique to the instrument, which is stored in non-volatile memory. Each time the converter is powered
up, the serial number is shown in the display. An example is shown below:
025
F70.00
2. General
Final testing begins with a visual inspection of the unit to ensure that all the relevant parts are present and
correctly fitted.
3. Insulation Test
During the production testing procedures, the insulation is tested between terminal 3, the supply earth, and
power terminals 1 and 2. The test used applies the following criteria:
AC instruments - 2.1 kV DC, <1 mA, for >1 min.
DC instruments - 0.7 kV DC, <1 mA, for >1 min.
4. Accuracy Testing
The automated checks in service code 80 are used in this procedure.
This automatically sets the unit to mg/l, and temperature measurement reading in °C.
Calibration data is reset to 100% slope and 0 mV offset, temperature compensation is set to
manual (Tref 25° C). Membrane thickness is set to 25 um.
The mA1 output range is set to 0-20 mgl/l (4-20 mA), mA2 output range is set to 0-50° C (4-20 mA).
Note: all setting are restored when the test mode 80 is completed.
YOKOGAWA
EXA Series
Model DO402G
Converter for Dissolved Oxygen
Unique Number
Line Number
ATE no. (Automatic Test Equipment no.)
Month code
Year code
Databankweg 20
3821 AL Amersfoort
The Netherlands
Annexe 10-7
QIS 12J6B3-E
th
4
Edition June 2005
IM 12J6B3-F-E
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