24
8. Troubleshooting
Error Messages
The instrument performs a Power On Self Test each time it is turned on. The following error
messages are provided to facilitate troubleshooting. They appear on the LCD when an error is
detected.
Symptom
Possible Cause
Action
1.
Instrument will not turn on
•
Low battery voltage
•
Batteries installed wrong
•
Meter requires service
•
Replace batteries (pg 2)
•
Check battery polarity (pg 2)
•
Return system for service (pg 29)
2.
Instrument "locks up"
•
Instrument has received a shock
•
Batteries are low or damaged
•
System requires service
•
Remove battery lid, wait 15 seconds
for reset, replace lid. (pg 2)
•
Replace batteries (pg 2)
•
Return system for service (pg 29)
3.
Conductivity will not calibrate
•
Conductivity standards out of spec.
•
Conductivity cell is contaminated
•
Recalibrate with known good
standards (pg 11)
•
Clean conductivity cell (pg 20)
4.
pH will not calibrate due to
unstable readings (decimal point
keeps flashing)
•
pH sensor is fouled
•
pH sensor is bad
•
System requires service
•
Clean pH sensor (pg 20)
•
Replace pH sensor (pg 4, 33)
•
Return system for service (pg 29)
5.
pH readings are inaccurate
•
Calibration is required
•
pH calibration buffers out of spec
•
Calibration procedure not correct
•
Sample temperature is over 20°C
from calibration temperature
•
pH sensor is fouled or damaged
•
pH Sensor is bad
•
System requires service
•
Recalibrate with known good
standards (pg 6)
•
Calibrate within
±
20°C of sample
temp (
±
10°C for best results)
•
Clean pH sensor (pg 20)
•
Replace pH sensor (pg 4, 33)
•
Return system for service (pg 29)
6.
Conductivity readings are
inaccurate
•
Cell is contaminated
•
Calibration is required
•
Temperature coefficient is set
incorrectly
•
Reference temperature is set
incorrectly
•
Readings are or are not temperature
compensated.
•
Clean conductivity cell (pg 21)
•
See Conductivity Calibration (pg 11)
•
See Changing The Temperature
Coefficient (pg 18)
•
See Changing The Reference
Temperature (pg 19)
•
See Making Measurements (pg 12)
7.
LCD displays "LO BAT"
•
Batteries are low or damaged
•
System requires service
•
Replace batteries (pg 2)
•
Return system for service (pg 29)
8.
Main Display reads “nOnE”
•
During recall, no data is currently
stored in memory.
•
Store data before attempting to recall
(pg 14)
9.
pH Display reads “OVEr”
•
When calibrating: pH level is over
range allowed for the buffer value
selected.
•
When measuring, pH level is > 14
•
Recalibrate with known good
standards (pg 6)
•
Clean pH sensor (pg 20)
•
Replace pH sensor (pg 4, 33)
•
Return system for service (pg 29)
