PASCO Specialty & Mfg. CI-6734 User Manual download pdf (Page 17)

012–06615A Sodium Ion Selective Electrode

Standards & Reagents

Whenever problems arise with the measuring procedure that has been used successfully in the past, be Sure to check

the standard and reagent solutions. If in doubt about the credibility of any of the solutions, prepare them again. Errors

may result from contamination of the ISA, incorrect dilution of standards, poor quality distilled/deionized water,

or a simple mathematical miscalculation.

Sample

Look for possible interferences, complexing agents, or substances which could affect the response or physically

damage the sensing electrode (or the reference electrode) if the electrodes work perfectly in the standard, but not

in the sample.

Try to determine the composition of the samples prior to testing to eliminate a problem before it starts. (See

Measuring Hints, Sample Requirements, and Interferences.)

Technique

Be sure that the electrode’s limit of detection has not been exceeded. Be sure that the analysis method is clearly

understood and is compatible with the sample.

Refer to the instruction manual again. Reread General Preparation and Electrode Characteristics.

If trouble still persists, call PASCO Technical Support.

Troubleshooting Hints

Symptom Possible Causes Next Step

Out of Range Reading defective electrode check electrode operation

electrodes not plugged in unplug electrodes and reseat electrodes

properly

reference electrode not filled replenish reference filling solution

electrodes not in solution put electrodes in solution

air bubble on membrane remove bubble by re-dipping electrode

1 2 ... 12 13 14 15 16 17 18 19 20 21 22

No comments

PASCO Specialty & Mfg. CI-6734 User Manual Page 17