K-Patents DD-01 - Manual (Page 16)

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WASH TIMES
The wash times can be seen by pressing Display/System configuration/Wash times. The values set at delivery
are the following:
Preconditioning = 0 seconds
Wash time = 3 seconds
Recovery time = 30 seconds
Interval = 20 min
The wash times are changed by pressing the sequence Calibrate/Parameters/Prism wash.
Note maximum wash time is 30 seconds and maximum recovery time 30 seconds.
WASH CHECK
This function can be defined from the prism wash menu: Calibrate/Parameters/Prism wash/Wash test. A prism
wash is accepted if:
a. TEST exceeds “TEST limit”
b. TEST increases more than “TEST difference”
The default values of “TEST limit” and “TEST difference” are zero (0), which makes the wash check inactive.
If the wash is not accepted, the diagnostic message will be “Prism wash failure”.
A “Wash retries” parameter can also be set to repeat the wash if the wash check fails. The default value is zero
(0).
WASH STOP
Wash stop function can be defined from the prism wash menu. Wash can be prevented when the process tem-
perature is below the set limit, thus indicating that the pipe is not in use. To activate the “wash stop” key se-
quence: Calibrate/Parameters/1. Prism wash/Wash stop/1. Active and set the temperature limit.
The default value for wash stop is inactivate. When the wash is not accepted the diagnostics message is “Wash
stop/temp. limit”.
EXTERNAL WASH STOP
An input switch can be configurated to an external wash stop to prevent the prism wash when the correspond-
ing input switch is connected. “External wash stop”-message will show when automatic wash is activated from
the soft keys. The input switch can be set to protect the refractometer e.g. if the process is stopped.
AUTOMATIC SINGLE DIVERSION CONTROL DURING PRISM WASH CYCLE
Automatic single (one-of-two) diversion control will take place if either of sensors are in prism WASH cycle.
5.7. DIVERT DECISION RULES
TWO REFRACTOMETERS IN OPERATION:
BLRBAC states the following: For the solids measurements, two refractometers in series must be used. When
both refractometers are in service, the requirement for an automatic black liquor diversion can be satisfied by
either of the following options:
1. If either refractometer reads dissolved solids content 58% (default) or below, an automatic
black liquor diversion must take place.
INSTRUCTION MANUAL FOR DD-01 DOCUMENT/REVISION: IMD 1/5
Effective: June 20, 2005