FAS622en_pH measurement
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3 Quality assurance<br />
3.3.1 Critical effects on the reference electrode<br />
Fig. 17:<br />
Reference electrode<br />
(1) Reduction<br />
- grounding<br />
- damp connector and cable<br />
- incorrect wiring<br />
- semiconducting layer<br />
not removed<br />
(2) Contamination<br />
- sulfide<br />
- cyanide<br />
- ammonia<br />
- heavy metals<br />
- reducing agents<br />
(3) Blockage<br />
- coatings<br />
- grease<br />
- albumen<br />
- organic substances<br />
- surfaces drying out<br />
- sulfides<br />
30 3 Quality assurance JUMO, FAS 622, Edition 04.07
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