<4. Setting converter>
4-17
IM 12A01F01-03EN 2nd Edition : Feb. 19, 2019-00
Sensor wellness (only PH)
FLXA402 has a function for checking whether measurements are normally conducted after wash,
with checking a sensor response.
The wash recovery check is performed by making use of the time to recover half the wash-cycle
pH change. The half the wash-cycle pH change recovery time replaces the relaxation time with
the recovery time.
Whether to conduct the wash recovery check can be set on the Error setting. Half the wash-cycle
pH change refers to half the value (1/2ΔpH) of the difference (ΔpH) between the pH value during
normal measurement of an example in Figure 4.6 and the pH value detected during wash.
If the pH value during wash is greater than 1/2ΔpH when 1/3 tR has elapsed, the electrode is
assumed to be good. If it is smaller than 1/2ΔpH, then the electrode is assumed to be bad.
However, for applications where the pH during wash shows almost the same value as the normal
pH, the difference will be approximately zero. In such a case, disable the wash recovery check.
An example of such applications is the monitoring of waste water pH. If you select water jet
cleaning in such a case, the normal pH as well as the washing time pH will be around pH 7; the
difference will be approximately zero, so the recovery time check will not work normally.
This function is also available for ORP only measurement.
pH
Time
Good Electrode
Bad Electrode
tR : Recovery Time
tW : Wash Time
tI : Wash Period
1/2∆pH
∆pH
1/3tR
tI : Interval Time
tW : Wash Time
tR : Recovery Time
F050605_3.ai
Figure 4.11