Hach-Lange SI794 D User Manual - Manual (Page 86)

Response
time
Cal timer Slope Zero point
Sensoface
(Sensocheck must have been activated during configuration.)
Range
The little smiley in the display (Sensoface) alerts to sensor
problems (defective cable, maintenance required).
The permitted calibration ranges and the conditions for a friendly,
neutral, or sad Sensoface are summarized in the following table.
Additional icons refer to the error cause.
Replace membrane module or filling solution, if required.
Type A sensors (Hamilton Oxyferm, Oxysens)
25 .... 130 nA -2 ... +2 nA max. 720 sec
> 35 ... < 90 nA > - 0.3 ... < 0.3 nA ≤ 300 s ≤ 80 %
30 ... 35 nA
or
90 ... 110 nA
- 0.6 ... -0.3 nA
or
+0.3 ... +0.6 nA
300 ... 600 s 80 ... ≤ 100 %
< 30 nA or
> 110 nA
< - 0.6 nA or
> 0.6 nA
> 600 sec Timer expired
Note
The worsening of a Sensoface criterion leads to the devaluation
of the Sensoface indicator (Smiley becomes “sad”).
An improvement of the Sensoface indicator can only take place
after calibration or removal of the sensor defect.
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