Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer - Manuel (Page 53)

IM 12J6C3-F-E
Annexe 2-1
Quality
Inspection
Standard
EXA Series
Model DO202
Dissolved Oxygen Transmitter
ANNEXE 3 Quality Inspection Standard (QIS)
A-3-1. Introduction
This inspection procedure applies to the model
DO202 dissolved oxygen transmitter. 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, for
details see the Users manual:
A-3-2. General Inspection
Final testing begins with a visual inspection of the
unit to ensure that all the relevant parts are present
and correctly fitted.
A-3-3. Safety Test
Terminal 14 and the (-) minus are interconnected.
This interconnection and the external ground
terminal of the housing are connected to a Voltage
generator (600 VAC RMS) for 1 second. The
leakage current should remain below 4 mA.
The interconnection and the external ground
terminal of the housing are connected to a Voltage
generator (100 VDC). The measured impedance
value should be over ��00 Ω.
A-3-4. Accuracy Testing
Our automated testing facility checks the accuracy
of the current input of the instrument using a
calibrated current source to simulate the sensor
current.
A-3-5. Accuracy Testing of all supported
temperature elements
Our automated testing facility checks the input
accuracy of the instrument using a calibrated
variable resistor (decade resistor box) to simulate
the resistance of all temperature elements.
ANNEXE 2 Historique de révision du logiciel
Modifications du logiciel du DO202
A-2-1. Modifications apportées dans la version 1.1
•
Ajout du capteur de température Pb36 (DO30).
A-2-2. Modifications apportées dans la version 1.2
• Modification de “Burn low” en association avec le protocole HART.
• Affichage du courant de capteur au lieu du courant compensé.
• Réparation de mesure instable en étendue ppb lorsque le courant du capteur est négatif.