Package Include - daviteq A420-FCL User Manual

Problem
No reading (1)
No reading (2)
No reading and electrode feels warm
Zero point out of specification
Reading instable or fluctuation
Slope too low
Reading out of range

7. Package Include:

Possible Cause
Insufficient conditioning.
Electrode connection or power
supply.
PCB shorted or corrupted.
1. Water sample is not
chlorine free
2. Insufficient
polarization/conditioning
3. Interfering substances
cannot be cleaned
electrochemically.
1. Membrane cap fouled or
damaged.
2. Air bubbles on outside of
membranecap – especially
at center pore
3. Air bubbles inside the
membrane cap.
1. Membrane cap fouled.
2. IFG deterioration.
3. Insufficient conditioning
4. Flow rate too low.
5. Erroneous DPD
standardization.
1. Chlorine content >
maximum measuring range.
2. Electrode and membrane
cap are unmatched or
improperly attached.
Solution
Reading should appear within 10
mins.
Check connection/wiring.
Replace electrode
1. Replace the zero chlorine
water.
2. Continue polarizing
andconditioning electrode.
3. Brush WE with polishing
strip.
1. Clean or change membrane
cap.
2. Shake the electrode to
remove theair bubbles from
the center pore.
3. Shake electrode or inspect
the cap for air bubbles
1. Clean or change membrane
cap.
2. Refill IFG.
3. Recondition the electrode.
4. Adjust flow rate into
working range.
5. Check the measurement
range of the DPD and
recalibrate.
1. Confirm actual sample or
electrode range
specification
2. Reinstall the membrane cap
looser or slightly tighter.
Replace the membrane cap.