K-Patents DD-23 User Manual
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2.3.2 Green indicator lights: System ok
Each refractometer has a green operating light –
A IN OPERATION
and
B IN OPERATION
–
to let the operator know when he can rely on the refractometer measurement. A re-
fractometer will only inluence the divert decision and activate warnings and alarms
when it is in divert operation, i.e. when its green operating light is lit.
When DIVERT is effective, the system may be reset to normal operation only when
SAFE SOLIDS
is lit.
2.3.3 Yellow indicator lights: Warnings
The
SOLIDS WARNING
light indicates a black liquor concentration of below warning
limit (by default at 60%). This warning can be activated by either refractometer.
The
A&B DIFFERENCE
light is lit when the refractometer readings differ by at least 2%.
This warning will only be initiated if both refractometers are operating.
If the yellow
MALFUNCTION
light is switched on, some part of the system – a refrac-
tometer, an indicating transmitter or the control unit – is malfunctioning. A list over
malfunctions and critical malfunctions is given in Section 6.2. If a critical malfunction
occurs in a sensor or transmitter, the malfunctioning refractometer will be automat-
ically removed from divert operation (its operating light will also be switched off).
Check the reason for the malfunction and correct the problem (see Section 6.4) be-
fore returning the refractometer back to divert operation.
2.3.4 Red indicator lights: Alarms
The black liquor
SOLIDS ALARM
is lit when the concentration reading goes below alarm
limit (by default below 58%). This alarm can be activated by either refractometer
depending on the operation rule setting.
The
DIVERT
light will be switched on when the
SOLIDS ALARM
is activated. The
DIVERT
light indicates divert status of the divert relay. The relay is inactive in the divert posi-
tion, because then a power failure will give a divert decision signal to the system.
The
OVERRIDE
light is lit to indicate that no automatic divert will happen as long as
the system is in the header wash state (see Section 2.3.6).
2.3.5 White pushbuttons: Testing and resetting
The
LIGHT TEST
button switches all 12 lights on. The
ALARM RESET
button resets the
alarm lights.