Manual


XVIII. TROUBLESHOOTING CHART
Symptom Possible Cause
No display, even though
measurement key pressed
Battery weak or not connected.
Inaccurate pH readings

1. pH calibration needed.
  

pH buffers or samples in sensor
well.

No response to pH changes

Sensor bulb is cracked or an
electromechanical short caused by
an internal crack.
Will not adjust down to pH


pH readings drift or respond
slowly to changes in

or
“FAC” is displayed

1. Temporary condition due to
“memory” of solution in pH
sensor well for long periods.
 

coated.
Unstable
Conductivity/TDS/
Resistivity readings
1. Dirty electrodes.

megohm.
Unable to calibrate
Conductivity/TDS
Film or deposits on electrodes
.
Resistivity readings much
lower than expected
1. Contamination from previous
sample or from pH sensor well.

Corrective Action
Check connections or replace battery.




  










1. Clean cell cup and electrodes.
  

  
Clean cell cup and electrodes.


measurement. Ensure pH cap is snugly
in place.
