Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer Manuale Utente Scaricare il pdf (Pagina 54)

IM 12J6C3-F-E

2-2 Annexe

A-3-6. Overall accuracy test

This test can be performed by the end-user to check

the overall accuracy of the instrument. The data

specified on the Quality Inspection Certificate are

results of the overall accuracy test performed during

production and can be reproduced by performing

similar tests with the following test equipment:

1. A variable resistor box 1 (resistor decade box)

to simulate the temperate element. All tests are

performed simulating 25ºC (77 ºF).



µA-output load.

3. A current source ranging from 0 µA to 50 µA,

resolution 0.01 µA with an accuracy of 0.05%

(galvanic).

4. A current source ranging from 0 nA to 1200nA,

resolution 0.01 nA with an accuracy of 0.05%

(polarographic).

5. A stabilised voltage supply unit: nominal 24 Volt

6. A current meter for DC currents up to 25 mA,

resolution 1mA, accuracy 0.1%

7. A multimeter capable of measuring megohm

ranges to check insulation impedance.

8. Screened cable to connect the input signals.

Box 1 (temperature)

Resistor decade

Electrode cable, 2 mtr.

EXA DO202

meter

Load Resistor

DC Power Supply

Galv

Polar

Galv

Polar

Figure 1. Connection diagram for the overall accuracy test

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Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer Manuale Utente Pagina 54