YSI PRO20 Manuel d'utilisateur télécharger pdf (Page 38)

Symptom Possible Solution

Instrument readings are inaccurate.

1) Verify correct sensor/membrane type

selection in the System Setup menu.

2) Verify calibration, barometer reading,

and salinity settings are correct and

recalibrate.

3) Verify accurate temperature readings.

4) Sample temperature is over 45 ºC, the

temperature compensation range.

5) Probe may not have been in 100%

water saturated air during calibration

procedure. Moisten sponge in

calibration sleeve and recalibrate.

6) Replace membrane and electrolyte,

recalibrate.

7) Clean sensor electrodes.

8) Return system for service.

Dissolved Oxygen values display

Over or Undr on run screen.

1) Verify correct sensor/membrane type

selection in the System Setup menu.

2) If using a polarographic sensor, allow

instrument to warm up for 5 – 15

minutes before use.

3) Sample O

concentration is more than

50 mg/L or 500%, or less than –0.02

mg/L or -0.3%.

4) Verify barometer and salinity settings

are correct and recalibrate.

5) Verify accurate temperature readings.

6) Replace membrane and electrolyte.

Recalibrate.

7) Clean sensor electrodes.

8) Return system for service.

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YSI PRO20 Manuel d'utilisateur Page 38