YSI Pro2030 - Manual (Page 22)

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to air dry completely. Next, use a new clean, dry cap membrane to screw over the
sensor. This will keep the sensor dry and protect the anode and cathode during
storage. Ensure the conductivity sensor is clean and dry.
After storing for a long period of time, it is necessary to “condition” the dissolved
oxygen sensor by installing a new membrane with electrolyte solution.
Long Term Storage Temperature: -5 to 70°C (23 to 158°F)
T R o U B L E S H o o T I N G
Symptom Possible Solution
Instrument will not turn on,
a battery symbol appears,
or “Critical Shutdown”
displays on the screen.
Low battery voltage, replace batteries. 1.
Batteries installed incorrectly, 2.
check battery polarity.
Return system for service. 3.
Barometer reads over/undr and
calibrating Dissolved oxygen
results in a Barometric Pressure
over/Undr error message.
Barometer failure, return 1.
system for service
Temperature values display
over or Undr on Run screen.
Sample temperature is less than -5° C or 1.
more than +55°C. Increase or decrease
the sample temperature to bring within
the allowable range.
Contact YSI Tech Support. 2.
Instrument will not calibrate
dissolved oxygen; instrument
displays “Calibration over”,
“Calibration Under”, or “Unstable
Reading” during calibration.
Verify barometer reading. 1.
Verify correct sensor and membrane 2.
type selection in the System Setup menu.
Calibration sleeve may not be 3.
100% water saturated, ensure
sponge is moistened.
Ensure adequate sample movement if 4.
performing mg/L or ppm calibration.
Allow sufficient stabilization time for 5.
dissolved oxygen and temperature AND
wait at least 3 seconds before confirming
a Do% or Do Local% calibration.
Replace membrane and electrolyte. 6.
Clean sensor electrodes. 7.
Contact YSI Tech Support. 8.
Symptom Possible Solution
Do readings are inaccurate. Verify correct sensor/membrane type 1.
selection in the System Setup menu.
Verify conductivity readings are 2.
accurate. Conductivity is used
in the calculation of mg/L.
Verify temperature readings 3.
are accurate.
Sample temperature should be 4.
between 0 and 45 ºC, the temperature
compensation range for Do mg/L.
Do sensor not properly calibrated, 5.
recalibrate the sensor.
Replace membrane and 6.
electrolyte. Recalibrate.
Clean sensor electrodes. 7.
Contact YSI Tech Support. 8.
Dissolved oxygen values display
over or Undr on Run screen.
Verify correct sensor/membrane type 1.
selection in the System Setup menu.
If using a polarographic sensor, 2.
allow instrument to warm up for
5 – 15 minutes before use.
Sample dissolved oxygen concentration 3.
is more than 50 mg/L or 500%, or
less than –0.02 mg/L or -0.3%.
Verify conductivity 4.
readings are accurate.
Verify temperature readings 5.
are accurate.
Replace membrane and 6.
electrolyte. Recalibrate.
Clean sensor electrodes. 7.
Contact YSI Tech Support. 8.