YSI 95 - Manual (Page 21)

YSI Incorporated Model 95 17
SECTION 8 SECTION 8 SECTION 8 SECTION 8 TROUBLESHOOTING TROUBLESHOOTING TROUBLESHOOTING 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 (Section 2)
B. Check battery polarity. (Section 2)
C. Return system for service (Section 9)
2. Instrument will not calibrate
A. Membrane is fouled or damaged
B. Probe anode is fouled or dark
C. Probe cathode is fouled
D. System requires service
A. Replace membrane cap (Section 3)
B. Clean anode (Section 6)
C. Buff cathode (Section 6)
D. Return system for service (Section 9)
3. 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. (Section 2)
C. Return system for service (Section 9)
4. Dissolved Oxygen readings are
inaccurate
A. Cal altitude is incorrect
B. Probe not in 100% water saturated
air during Cal procedure
C. Membrane fouled or damaged
D. Probe anode is fouled or dark
E. Probe cathode is fouled
F. System requires service
A. Recalibrate w/correct value (Section
4)
B. Moisten sponge & place in Cal
chamber w/ probe & Recal (Section 4)
C. Replace membrane cap (Section 3)
D. Clean anode (Section 6)
E. Buff cathode (Section 6)
F. Return system for service (Section 9)
5. LCD displays "LO BAT" A. Batteries are low or damaged A. Replace batteries (Section 2)
6. Main Display reads “OVEr”
(Secondary display reads “ovr”)
(Secondary display reads “udr”)
A. Temperature reading is >45°C
B. Temperature reading is <-5°C
C. DO temperature is >45°C
D. DO % saturation is >500%
E. DO concentration is >50 mg/L
F. Probe current too high to calibrate
In all cases, check calibration values and
procedures. (Section 4)
If each of these were done correctly,
return instrument for service. (Section 9)
7. Main display reads “PErr” A. Incorrect sequence of keystrokes. A. Refer to manual section for step by step
instruction for the function you are
attempting.
8. Main display reads “Err”
(Secondary display reads “ra”)
A. System has failed its RAM test check
procedure. A. Turn instrument OFF and back ON
again.
B. Return the system for service (Section 9)
9. Main display reads “Err”
(Secondary display reads “ro”)
A. System has failed its ROM test check
procedure. A.Turn instrument OFF and back ON
again.
B. Return the system for service (Section 9)