BECS BECSys2 Benutzerhandbuch - Seite 6

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Operator's Manual

The BECSys2 requires no maintenance other than a periodic calibration check and sensor cleaning.

C - 1: Potentiometric Sensors (pH and ORP)

C - 1.1: Electrode Cleaning:

Slow response time and large offsets may indicate the

electrode has become coated. The nature of the

coating will dictate the type of cleaning technique

that should be used.

You may lightly blot the water on a pH sensor

tip on a paper towel, but never vigorously rub

or wipe the pH bulb because this may scratch

the delicate outer layer on the pH glass

impairing its response.

Soft coatings, like bacterial films, are best removed

using a squirt bottle or the water jet from a faucet.

If this is not successful, then gently wipe with a

soft wet cloth.

For a more severe coating, first try a strong

detergent (something similar to Dawn liquid

detergent) and warm water, using a soft brush (like

a toothbrush). Isopropyl alcohol on a Q-tip is

another good choice. Rinse the measuring end in

distilled water before reinstallation.

Greasy and oily coatings are best removed with a

detergent solution or a solvent that will not attack

the sensor body. Methanol and isopropyl alcohol

are good choices for solvents. Acetone, MEK,

THF, or trichloroethane will irreparably harm the

electrode.

Hard coatings, like calcium or lime scale, are best

removed with a solvent appropriate for the

particular coating. A 5% solution of hydrochloric

acid (HCl) would be a good choice for calcium

scale. If unsure of the proper solvent to remove a

hard mineral coating, then alternate between a 5%

hydrochloric acid and a 4% sodium hydroxide

(NaOH) for 10 minutes each. After treating the

electrode with these strong acids or bases, rinse the

electrode with water and soak it in a pH 4 buffer

for at least 1/2 hour.

The platinum tip of an ORP sensor can be cleaned

with an abrasive as a last resort. Gently scour the

platinum with a 600 grit wet emery cloth, or

preferably, a 1-3 micron alumina polishing powder.

Page 4

9487 Dielman Rock Island Industrial Dr. St. Louis, MO 63132 Tel:(314) 567-0088

Section C: Maintenance

C - 1.2: Long-Term Storage:

Save the wetting cap that came with the sensor for

long-term storage.

from the flow-cell, clean it as in routine

maintenance, then store it in the wetting cap using

a pH 4 buffer saturated with potassium chloride

(KCl).

electrolyte from leaching out of the sensors

reference cell. The wetting cap only needs to be

half full. If a number of sites are going to be

serviced, for example, at the end of a season, then

it might be a good idea to carry a pint of 4.0/KCl

storage solution.

After removing the sensor

The potassium chloride will prevent

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