User Manual

53
XVIII. TROUBLESHOOTING CHART
Symptom Possible Cause Corrective Action
No display

Battery weak or not connected. Check connections or replace battery. Ref. Battery Replacement, pg. 50.
pH readings 1. pH calibration needed. Ref. pH Cal.,
pg. 33.
 

 
 
 
 
No response to pH changes 

internal crack.
Replace pH/ORP sensor. Ref. Replacement pH/ORP Sensor, pg. 56.
pH 7 pH/ORP sensor has lost KCl. 

pH readings drift or respond slowly to
FAC
is displayed repeatedly
 

 
 


Unstable Conductivity/TDS/
Resistivity readings
 
 
atmospheric contamination.
 
 

Unable to calibrate Conductivity/
TDS
Film or deposits on electrodes. 
Resistivity
expected
 
from pH sensor well.
2. Carbon dioxide in test sample.
 
place.
 
Alkalinity or Hardness titration with
calibration 
stated on bottle
1. Method error.
 
 
 
 
1. Repeat titration.
 
 
4. Use a new pipette.
 

Low Reading
Slow or no response to ORP changes
 Clean ORP electrode with ORP conditioner. Ref. Cleaning Sensors, 2. pH/ORP
Sensor, pg. 50.