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

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5.6 Low alarms
5.6.1 Solids warning
If the concentration reading of either refractometer falls below this limit (60% by de-
fault), the warning is activated. The limit can be changed through the remote interface,
see Section 8.2.5.
Minimum low warning level is 60% according to BLRBAC.
5.6.2 Solids alarm
If the concentration reading of either refractometer falls below this limit (58% by de-
fault), the alarm is activated. The limit can be changed through the remote interface,
see Chapter 8.
Minimum low alarm level is 58% according to BLRBAC.
5.7 Refractometer malfunction alarm
The built-in intelligent diagnostics of a K-Patents Process refractometer provide a
tight control of the operation. A full test cycle is completed with an interval of less than
one second. For details consult the Process refractometer PR-23 instruction manual.
Not all malfunctions cause the instrument to be removed from the Divert control sys-
tem. However, all malfunction alarms need to be checked, see Section 6.2 for more
information.
5.8 Prism wash
Even though the sensors are equipped with a steam wash facility, it is not necessarily
needed. For K-Patents Process Refractometer, the need of prism wash is reduced and
even in some cases eliminated.
However, an automatic regular prism wash provides an ef󰅮icient check that the re-
fractometer reacts. A steam wash of 3 seconds every half hour should be suf󰅮icient.
Only one instrument is washing at a time, and during the wash the system acts in the
single-instrument mode.
To change wash times or relay con󰅮igurations, consult the PR-23 process refractome-
ter system manual, sections 6.1.3. Con󰅳iguring relays and 6.3.1. Setting prism wash
parameters.