MIP LM 3086 SE/EPA3 manual, rev2
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16.10.2018
Page 65 / 105
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Continue at receiver side:
6.
Stretch conduit in a straight line.
7.
Remove both the signal wire and the zero pipe. Pulling gently on both the wire and the fibre if the
conduit is straight can do this.
8.
Insert a fish tape into conduit.
9.
The best way to fish the zero pipe is to attach the signal wire to the fish tape, and the zero pipe to the
wire, putting the strain on the wire. Zero pipe, which is just a large fibre cable, is somewhat fragile, so
use caution when fishing. Note the labels on the zero pipe. The best way to fish the bundle through is
to pull the receiver end through the conduit allowing 18 inches of slack on the zero pipe at the
receiver end, about 24 inches or so will be left on the laser end. The length on laser end is not critical,
just the receiver end. You will only need 4 inches or so of the signal wire on each end. The zero pipe is
longer than the signal wire. Please do not try to pull connector thru conduit.
10.
Verify that the lens, fibre turning mirror and the fibre lens on the receiver are all very clean.
11.
Re-attach the appropriately labelled ends to both the transmitter and the receiver. Put the excess
zero pipe in the hold down clips. Re-tighten the zero pipe set screws and the signal wire.
12.
Power up transmitter, then the monitor.
13.
A clear stack will need to be performed, see appendix c for details. Allow the monitor and the laser to
warm up, with the transmitter door close for at least one hour.
5.8
APPENDIX H: CROSS STACK ALIGNMENT
5.8.1
CROSS STACK ALIGNMENT
The cross stack alignment procedure is fairly simple. It involves the physical aligning of the transmitter and
receiver so that the laser light strikes the receiver detector.
A step, by step procedure is not necessary. The alignment is achieved by using the alignment wheel located
inside the top of the transmitter.
The wheel is taken to the receiver side, and placed inside the receiver housing on the hasp side. The zero pipe
is fished through the cut-out. The idea is to get the laser beam, which is the brighter smaller image, centred
on the cross hairs of the alignment wheel. The larger fixed green image is the zero pipe.
Loosening and tightening the transmitter side achieve the alignment. Tightening the left side of the
transmitter for example, will shift the image on the alignment wheel to the right, and vice versa. The same
holds true for the up and down motion.
The cross stack alignment is important, since most stacks shift with temperature changes, potentially moving
the laser image outside of the detector area. It is not a critical situation if the image is not 100% centred after
the unit operates, and the stack shifts, as long as the image strikes the detector, accurate reading will be
calculated. The centring just allows for variations in stack movement.