Metrohm 827 pH lab Manual do Utilizador descarregar pdf (Página 52)

8.1 Troubleshooting

44 826/827 pH meter, Instructions for Use

Problem Possible cause Remedy

Measuring signal absent

or very variable

Electrode not connected • Connect electrode

Air in or in front of the diaph-

ragm

• Remove air

Faulty electrode • Replace electrode

Measured value remains

unstable and does not

fulfill drift criterion

Dirty glass membrane or diaph-

ragm

• Clean membrane or diaphragm

pH or temperature of the solu-

tion is not stable

• Measure under exclusion of air

• Thermostat the solution

Unsuitable electrode:

• Conductivity too low

• Organic solution

• Use suitable electrode

Electrode not connected • Connect electrode

Faulty electrode • Replace electrode

Slow adjustment of

measured value

Dirty glass membrane or diaph-

ragm

• Clean membrane or diaphragm

Slope too small on cali-

bration

Dirty glass membrane or diaph-

ragm

• Clean membrane or diaphragm

Glass membrane deswollen af-

ter measurement in non-

aqueous solution

• Immerse electrode in water between

measurements

Poor buffer solutions • Replace buffers

Old Electrode • Replace electrode

Measured value obvious-

ly incorrect

Incorrect calibration • Check / Repeat calibration

• Check / Replace buffers

Manual temperature input incor-

rect

• Enter correct temperature of the solu-

tion

Dirty glass membrane or diaph-

ragm

• Clean membrane or diaphragm

Electrolyte or electrode too old • Refill electrolyte or replace electrode

Faulty electrode • Replace electrode

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