Sper-scientific 850055 pH Meter - Advanced Manuel d'utilisateur télécharger pdf (Page 29)

MAINTENANCE

2. Put the probe in a buffer solution of pH 7.00 with sat-

urated quinhydrone.

3. Stir; mV reading (E1) should be 86 ±15mV.

4. Rinse the probe with distilled water between each use.

Keep the ORP probe wet. If not in use for long periods,

it should be rinsed and stored in the soaker bottle filled

with the saturated KCL solution.

ORP Probe Cleaning

A contaminated sensing element can result in a slow

response and/or inaccurate reading.

 If contamination is a mineral matter, put the sensing

element in a HCl solution 0.1 N for 10 minutes. Then

rinse in distilled water.

 If contamination is oil or grease, clean with a mild

detergent. Then rinse with distilled water.

Upon completion of either cleaning method, immerse the

probe in a saturated buffer solution with pH 4.01 for 15

minutes and rinse with distilled water.

Probe Performance

The sensing element of an ORP probe is made of a high

purity metal. Slow response time and inaccurate readings

may be caused by the sensing element previously having

been soaked in a solution for a long period of time. An ox-

idation reduction coating may have formed on the surface

of the sensing element. Resolve by cleaning the element.

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Sper-scientific 850055 pH Meter - Advanced Manuel d'utilisateur Page 29