Lamotte COMBINATION pH ELECTRODE 1904 User Manual download pdf

COMBINATION pH ELECTRODE

CODE 1904

OPERATING TECHNIQUES

1. The electrode is shipped in a plastic bottle containing a solution of potassium

chloride in buffer. The electrode should remain in the bottle until it is used. The

bottle and the solution should be saved for storing the electrode (see Electrode

Storage).

2. During shipment the air bubble in the electrode’s stem may move into the bulb

area. If bubbles are seen in the bulb area, hold the electrode by its top cap and

shake downwards.

3. Vigorously stir the electrode in the sample, buffer or rinse solution to bring

solution to the electrode’s surface quickly and improve speed of response.

4. Use a part of the next sample or buffer which is to be measured in the rinse

solution to minimize contamination from carryover.

5. When calibrating, use a buffer close in value to that expected from the sample to

minimize span errors.

6. Keep buffers and samples at the same temperature to eliminate the need to

correct values for temperature effects.

7. pH readings stabilize faster in some solutions than others; allow time for the

reading to stabilize. In general, buffers provide stable readings in several seconds

(tris buffers take somewhat longer) while samples usually take longer.

8. Keep in mind that all pH electrodes age with time. Aging is characterized by

shortened span and slower speed of response. If the meter has a manual or

microprocessor slope (span) control, the control can be adjusted to compensate

for electrode span errors (but will not affect the speed of the response). Aging is

best detected by calibrating the electrode in, for example, a 7 buffer, then rinsing

and placing the electrode in a 4 buffer. As a rule, if the span is 10% or more in

error (a reading of 4.3 or higher for this example) the electrode should be cleaned

and retested (see Electrode Cleaning). If performance is not restored, the

electrode should be replaced.

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Summary of Contents

Page 1 - COMBINATION pH ELECTRODE

COMBINATION pH ELECTRODECODE 1904OPERATING TECHNIQUES1. The electrode is shipped in a plastic bottle containing a solution of potassiumchloride in buf

Page 2 - LaMOTTE COMPANY

CALIBRATION & MEASUREMENTFollow the procedure recommended by the pH Meter manufacturer keeping in mindthe Operating Techniques outlined in the pre

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Lamotte COMBINATION pH ELECTRODE 1904 User Manual

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