YSI 85 - Manual (Page 37)

YSI, Incorporated Model 85 33
SECTION 12 TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSE ACTION
1. Instrument will not turn on A. Low battery voltage
B. Batteries installed wrong
C. Meter requires service A. Replace batteries
B. Check battery polarity.
C. Return system for service
2. Instrument will not calibrate
(Dissolved Oxygen)
A. Membrane is fouled or damaged
B. Probe anode is fouled or dark
C. Probe cathode is tarnished
D. System requires service A. Replace membrane & KCl
B. Clean anode
C. Clean cathode
D. Return system for service
3. Instrument will not calibrate
(Conductivity)
A. Cell is contaminated A. See “Maintenance” Section
4. Instrument "locks up" A. Instrument has rec'd a shock
B. Batteries are low or damaged
C. System requires service A & B. Remove battery lid, wait 15
seconds for reset, replace lid.
C. Return system for service
5. Instrument readings are inaccurate
(Dissolved Oxygen)
A. Cal altitude is incorrect
B. Probe not in 100% O
2
saturated air
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. 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
6. Instrument readings are inaccurate
(Conductivity) 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. See “Calibration” Section
B. See “Maintenance” Section
C. See “Advanced Setup” Section
D. See “Advanced Setup” Section
E. See “Making Measurements”
Section
7..LCD displays "LO BAT"
Main display flashes “off”
A. Batteries are low or damaged A. Replace batteries
8. Main Display reads “OVEr”
(Secondary display reads “ovr”)
(Secondary display reads “udr”)
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 In all cases, check calibration values and
procedures; check advanced setup settings.
If each of these are set correctly,
return instrument for service.
9. Main display reads “Undr” A. User cell constant cal K is <4.9
B. DO current too low to calibrate A. Recalibrate instrument using known
good conductivity standard.
Follow cell cleaning procedure in
the Maintenance section.
B. Replace membrane, clean probe
10. Main display reads “rErr” A. Reading exceeds user selected
manual range.
A. Use the mode key to select a higher or
lower manual range, or set system to
autoranging.
11. Main display reads “PErr” A. User cell constant cal K is 0.0
B. Incorrect sequence of keystrokes. A. See “Advanced Setup” section.
B. Refer to manual section for step by step
instruction for the function you are
attempting.