Campbell CS526 Manuale delle Istruzioni Scaricare il pdf (Pagina 19)

CS526 ISFET pH Probe

Clean the probe if any of the following occur:

• Low slope

• Drift

• Instability of the reading

• Slow calibration

• Probe will not calibrate

• pH value doesn’t change as expected when changing samples

Additionally, when sampling colored liquids, the probe should be cleaned

when the reference diaphragm is no longer white.

9.1.2 Cleaning Procedure

Read Section 9.1.2.1, Cleaning Tips (p. 12), before following this procedure.

1. Place probe in warm tap water (~60°) with a mild detergent and soak for 5

minutes, stir periodically.

2. Scrub the surface of the chip and the diaphragm (FIGURE 9-1) with a soft

toothbrush and water with a mild detergent (see Caution).

Never brush the probe tip, especially the ISFET chip, before

rinsing and flushing thoroughly with water. Before rinsing

debris and particles may be on the sensor surface and

brushing them into the sensor may damage it. When in

doubt, soak the probe for a while in warm water with a mild

detergent.

FIGURE 9-1. Tip of the CS526 probe

3. Rinse thoroughly with deionized water.

4. Revitalize the probe (Section 9.1.3, Revitalizing

(p. 12))

5. Calibrate the probe (Appendix C, Calibration

(p. C-1)).

CAUTION

Diaphragm

Chip

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Campbell CS526 Manuale delle Istruzioni Pagina 19