K-Patents DD-23 - Manual (Page 7)

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2 The Divert Control System DD-23
2.1 Overview
The Divert control system DD-23 includes:
− A Divert Control Unit
− Two isolation valves SDI for the refractometers above to allow removal of the re-
fractometers from a pipe with full 󰅮low and pressure. The isolation valve includes
a prism wash nozzle and two check valves (one for prism wash, one for stuf󰅮ing
box 󰅮lush).
− A roofed mounting plate to mount the two Indicating transmitters and the Divert
Control Unit together.
− Wiring to connect the Indicating transmitters with the Divert Control Unit.
− Two steam valves with steam traps for prism wash (pneumatic + solenoid valves).
− Two hand valves (one for prism wash, one for stuf󰅮ing box 󰅮lush).
− A remote operator panel facility, accessible with a web browser over Ethernet
BLRBAC (The Black Liquor Recovery Boiler Advisory Committee) recommends a
spare refractometer sensor to be maintained in stock on-site.
2.2 Divert Control Unit
The Divert Control Unit is contained in an enclosure with the same dimensions as the
refractometer transmitter enclosure. The control unit includes:
− An operator with system state indicators and pushbuttons
− Relay outputs for connecting to the control system
− Contact inputs for external control
− Ethernet interface for remote operator panel
2.3 Operator panel
The operator panel has a clear layout and the operator can see all information at one
glance. The divert decision is controlled from the operator panel which provides dou-
bled security, since information is shown both as LED indication in the Divert control
unit and as a diagnostic messages in the Indicating transmitters. The same informa-
tion is also available through the remote operator panel.