CS525 ISFET pH Probe
The CS525 has no user-serviceable parts. Cable can be damaged by abrasion,
rodents, sharp objects, twisting, crimping or crushing and pulling. Take care
during installation and use to avoid cable damage.
6.1 Cleaning
It is possible that contamination on the diaphragm will block the built-in
reference electrode. In that case there will be no electrical contact between the
electrode and the ISFET chip and the probe will not function.
To prevent this, regular cleaning is recommended. The required frequency of
cleaning depends on the quality of the water. The best cleaning method is the
following “soapy water method”:
1.
Place the tip of the probe in soapy water that is 50
°
to 60
°
C and soak for
about 5 minutes (see Figure 6-1).
2.
Rinse thoroughly with deionized water.
3.
If necessary, lightly scrub the tip of the probe with a toothbrush to remove
debris (see Caution).
4.
Place the probe in saturated KC1 solution (CSI PN 16349) at about 20
°
C.
Keep probe in solution for about 30 minutes.
To prevent scratching the chip, a toothbrush should only
be used after soaking in soapy water. Most scratches
occur when hard particles are rubbed with a toothbrush on
the chip surface. This can cause irreversible damage to
the probe.
CAUTION
5.
Rinse the probe.
6.
Calibrate the probe (see Appendix A).
Diaphragm
Chip
FIGURE 6-1. Tip of the CS525 Probe
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