K-Patents DD-23 - Manual (Page 34)

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7.6 Refractometer difference logic
If there are two refractometers in operation (taken into operation, not washing), the
Control unit monitors the difference in reading between the two instruments (󰅮ig-
ure 7.6). If the difference is more than 2%, a refractometer difference warning is given
with the corresponding front panel indicator and relay.
The divert decision logic (section 7.2) is not affected by the refractometer difference,
but a signi󰅮icant difference between the two instruments indicates one of the instru-
ments is not measuring reliably. In this case the instruments and wash systems have
to be checked immediately. Ignoring to do this may result in an erroneous divert de-
cision.
no REFRACTO-
METER
DIFFERENCE
|A-B| > 2%?
2 instruments
available?
yes
no
no
yes
REFRACTO-
METER
DIFFERENCE
Figure 7.6 Refractometer difference logic