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Alignment of stack flanges
Stack flange alignment is shown on Drawing EMS-1001 and EMS 1002, and is the first step in successful
installation. The final beam alignment adjustments are described in the Beam Alignment Procedure.
Installation procedure - stack flanges
For an opacity monitor, the customer is required to supply and install two 3" I.P.S. flanges at eye level directly
across from each other. The flange faces, mounted on pipe stubs, should be approximately 6" to 8" from the stack
or insulation. On completion of the installation, the flanges must be aligned so that the total deviation of the light
source flange relative to a common centerline, does not exceed +1 o
and the retro reflector flange does not
exceed +3 o .
Flanges should be mounted approximately 5 feet up from the deck of platforms, roof or walk way.
At installations where conditions permit, this may be accomplished by using a piece of 2 1/2" pipe suspended
across the stack protruding far enough to allow slipping the 3" flange pipe assemblies over each end and welding
in place as shown in Drawing section 8.
Any deviation up to the previously specified limits can be adjusted out during the installation and alignment of the
light source and retro reflector with the system's alignment adjustments.
Where installations do not permit the use of the aforementioned method, the following procedure will accomplish
the same results. (See drawing section 8.) An alignment tool can be purchased from the factory to insure accurate
alignment.
Accurately locate one 3 1/2" diameter hole (large enough to accept the 3" pipe) and the other hole approximately
1/2" diameter, directly across from each other. Attach the alignment tool to the flange/pipe assembly and insert
the pipe into the 3 1/2" hole in the stack wall. Align the assembly with the 1/2" diameter hole on the opposite
side by viewing through the alignment tool and weld the pipe in place. Care must be exercised when welding to
maintain alignment.
The 1/2" diameter hole should now be enlarged approximately 3 1/2" to accept the other flange/pipe assembly.
Proceed in the same manner, installing the assembly with the alignment tool attached, and weld in place
maintaining concentric alignment with the 3" pipe previously installed on the opposite wall.
Sample area
To achieve a representative sample, the accepted practice is to have the measurement path of the instrument
directly in the centroidal area of the stack. An area should be chosen where the gases are not stratified in the stack
or duct. (See Federal Register excerpt in section 7)
Where a bend is involved, the path should be chosen to be the plane of the bend. Locations where large amounts
of condensed water may be present should be avoided.
MODBUS COMMUNICATION AND ADDRESSES
Protocol: Modbus (ASCII or RTU mode)
Speed: 1200-38,400 baud
Type: RS-485, optically isolated
RS-485 Modbus connections are 1-3 on the rear panel of the controller. RS-485 cabling may be up to 4000 feet in
length. Belden P/N 3106A cable is recommended.
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