YSI PRO20 Manual de usuario descargar pdf (Pagina 37)

TROUBLESHOOTING

ERROR MESSAGES

Symptom Possible Solution

Instrument will not calibrate;

instrument displays “Calibration

Over”, “Calibration Under”, or

“Unstable Reading” during

calibration.

1) Verify barometer reading

2) Verify correct sensor and membrane

type selection in the System Setup

menu.

3) Calibration sleeve may not be 100%

water saturated, ensure sponge is

moisten

4) Ensure adequate sample movement if

performing mg/L or ppm calibration

5) Allow sufficient stabilization time for

dissolved oxygen and temperature

AND wait at least 3 seconds before

confirming a DO % or DO %Local

calibration

6) Replace membrane and electrolyte

7) Clean sensor electrodes

8) Return system for service

Instrument will not turn on, a

battery symbol

appears, or

“Critical Shutdown” displays on the

screen.

1) Low battery voltage, replace batteries

2) Batteries installed incorrectly, check

battery polarity

3) Return system for service

Barometer reads over/under,

Dissolved Oxygen and

Temperature display Over/Undr,

and pressing Cal key results in a

Barometric Pressure Over/Undr

message.

1) Barometer failure, return system for

service

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YSI PRO20 Manual de usuario Pagina 37