Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer Instrukcja Użytkownika Pobierz pdf (Strona 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

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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.

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