
MIP LM 3086 SE/EPA3 manual, rev2
–
16.10.2018
Page 12 / 105
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2.
Reference Detector.
3.
Cable Link to Processor Board
4.
Power circuit board with status lights, supplying regulated voltages to the processor board and the
chopper motor
5.
Processor circuit board for controlling the optical block and calculating opacity values. All on-stack
calculated opacity values are sent through the serial link (RS 422 for serial cable, RS 232 if using a
fibre optic modem) in digital form, eliminating current losses.
6.
Complete Zero Pipe: Pr
otective tube “Anaconda” with Fiber and Cable.
7.
Optical block containing a chopper (sometimes called Dopper) motor with a four-sided mirror. Mirror
includes an upscale filter, and three deflecting mirrors to divert light source to the zero pipe, and to
the reference detector.
8.
Local power switch.
9.
A hinged fibre-glass NEMA 12 X rated enclosure attached to a hinged, standard 4" ANSI 150 # flange.
10.
Audit filter slot for use while conducting audit procedures.
11.
A G11/4” to 38mm(ID) connection for purge air (G11/4” to 19mm(ID) optional).
An optional hand-held unit is available for servicing, trouble shooting, and auditing the unit more easily,
allowing for easier service without watching the main controller unit. One person if necessary can do Service
and audits.
Refer to the appendix of this manual for the location of the different components of the laser unit including
terminal block connections.
The laser unit L3086 has three modes of operation:
Normal Mode
–
The laser beam passes through the stack effluent to the main detector located in the
receiver. The main detector signal is returned to the stack processor board, and compared to the reference
detector signal. The opacity measurement is synchronized to the rotation of the chopper wheel to reject any
stray non-laser light.
Simulated Zero Mode
–
(Zero and Dirty Window check) the laser beam is constantly deflected through the
effluent-free zero pipe checking for dirt contamination on any of the three optical surfaces on the receiver
unit.
Calibration Mode
–
(Span Check) the upscale filter located on one side of the chopper mirror is included in
the zero measurement loop. The value of the filter is measured and the corresponding value is stored in
memory.