K-Patents DD-23 - Manual (Page 10)

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2.3.6 Header wash key: Enabling ring header wash
The header wash key function is a 3-level procedure which can be used when ring
header washing with water is needed. When the
HEADER WASH key is switched to ON
position and information from black liquor guns switch inputs connected in series tell
that guns are out from recovery boiler, then a ring header wash can be done without
activating Divert.
Pushing the EMERGENCY DIVERT button will always initiate divert regardless of the
header wash functionality.
2.3.7 Emergency divert button: Manual divert
The EMERGENCY DIVERT push-button is used to manually initiate divert in an emer-
gency situation.
2.3.8 External emergency divert button
An external (remote) push button can also be connected to an input inside the Control
unit, see Figure 3.3.
External emergency divert button must be normally closed (NC). Opening the circuit
will initiate divert.
2.4 Prism wash
The wash parameters for the sensors are set through each transmitter (Section 2.4).
The transmitters contain a relay for prism wash. To follow the BLRBAC recommenda-
tion not to wash both prisms at the same time, the Divert Control Unit implements an
interlock which prevents the instrument from washing both sensors simultaneously.
2.5 Indicating transmitters
Mechanically the Indicating transmitters shipped with a DD-23 are the same than
PR-23 Indicating transmitter DTR. The transmitter will only allow single sensor con-
nection and a special DD-23 transmitter software is used for the Divert system. When
Divert software is 2.01 or newer, Indicating transmitter software version has to be
4.12 or newer.
For more information on the basic functions of an indicating transmitter, please see
the PR-23 manual, chapters 3 and 10.