Section 12 Troubleshooting - YSI 85 Operation Manual

SECTION 12 TROUBLESHOOTING

SYMPTOM
1. Instrument will not turn on
2. Instrument will not calibrate
(Dissolved Oxygen)
3. Instrument will not calibrate
(Conductivity)
4. Instrument "locks up"
5. Instrument readings are inaccurate
(Dissolved Oxygen)
6. Instrument readings are inaccurate
(Conductivity)
7..LCD displays "LO BAT"
Main display flashes "off"
8. Main Display reads "OVEr"
(Secondary display reads "ovr")
(Secondary display reads "udr")
9. Main display reads "Undr"
10. Main display reads "rErr"
11. Main display reads "PErr"
YSI, Incorporated
POSSIBLE CAUSE
A. Low battery voltage
B. Batteries installed wrong
C. Meter requires service
A. Membrane is fouled or damaged
B. Probe anode is fouled or dark
C. Probe cathode is tarnished
D. System requires service
A. Cell is contaminated
A. Instrument has rec'd a shock
B. Batteries are low or damaged
C. System requires service
A. Cal altitude is incorrect
B. Probe not in 100% O saturated air
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during Cal procedure
C. Membrane fouled or damaged
D. Probe anode is fouled or dark
E. Probe cathode is tarnished
F. System requires service
A. Calibration is required
B. Cell is contaminated
C. Tempco is set incorrectly
D. Reference temperature incorrect
E. Readings are or are not temperature
compensated.
A. Batteries are low or damaged
A. Conductivity reading is >200 mS
B. Temperature reading is >65°C
C. Temperature reading is <-5°C
D. Salinity reading is >80 ppt
E. User cell constant cal K is >5.25
F. DO temperature is >46°C
G. DO % saturation is >200%
H. DO concentration is >20 mg/L
A. User cell constant cal K is <4.9
B. DO current too low to calibrate
A. Reading exceeds user selected
manual range.
A. User cell constant cal K is 0.0
B. Incorrect sequence of keystrokes.
Model 85
ACTION
A. Replace batteries
B. Check battery polarity.
C. Return system for service
A. Replace membrane & KCl
B. Clean anode
C. Clean cathode
D. Return system for service
A. See "Maintenance" Section
A & B. Remove battery lid, wait 15
seconds for reset, replace lid.
C. Return system for service
A. Recalibrate w/correct value
B. Moisten sponge & place in Cal chamber
w/ probe & Recal
C. Replace membrane
D. Clean anode
E. Clean cathode
F. Return system for service
A. See "Calibration" Section
B. See "Maintenance" Section
C. See "Advanced Setup" Section
D. See "Advanced Setup" Section
E. See "Making Measurements"
Section
A. Replace batteries
In all cases, check calibration values and
procedures; check advanced setup settings.
If each of these are set correctly,
return instrument for service.
A. Recalibrate instrument using known
good conductivity standard.
Follow cell cleaning procedure in
the Maintenance section.
B. Replace membrane, clean probe
A. Use the mode key to select a higher or
lower manual range, or set system to
autoranging.
A. See "Advanced Setup" section.
B. Refer to manual section for step by step
instruction for the function you are
attempting.
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