What To Look For While Tracking And Locating; Pig Passages - CDI CD42 Instruction Manual

Figure 11 This End Out
Once the battery carousel has been placed correctly into the transmitter, place the cap of the unit
back into place. If you find it difficult to reinstall the cap, check the O-Ring for lubrication. If
the O-Ring is dry, bare rubber, apply some Vaseline or other petroleum based jelly to it and to
the inside of the transmitter body where the O-Ring meets. This should remedy the problem.
Screw the cap back in place with the five screws.
CDI‟s transmitters have no On/Off switches that might become dirty over time and fail, so the
transmitters operate whenever their batteries are installed. Therefore, the transmitter should now
be transmitting its magnetic signal.

What to Look for while Tracking and Locating

If you have followed the procedure above to this point, you should have a fully assembled and tested
CD42-R receiver and CD42-GP antenna. Place the transmitter about 5 paces away from, and parallel
to, the receiving antenna. If the transmitter has been correctly assembled you should now see standard
transmitter pulses flowing from the right to the left on the receiver‟s display that looks similar to Figure
12. Note that the gain is set to 3 for this test.
Figure 12
The pulses that are flowing across the display shown above are what you should look for when using
the equipment in the field. Below is a more specific discussion of how these pulses look in a true work
situation. If you do not see any pulses from the transmitter on the display of the receiver, check your
assembly of each device and the cabling. If you continue to have problems, please don‟t hesitate to call
CDI at the numbers on the title page of this manual.

Pig Passages

Normally a pig‟s progress through a pipeline is monitored by an operator with a CD42 receiver
"leapfrogging". This is the process of setting up in a location, waiting until after the pig passage has
CD42 Pipeline Pig Location & Tracking System
To reassemble the transmitter, simply reverse the disassembly procedure.
After installing new batteries into the carousel, slide it into the transmitter‟s
body. Be sure that you replace the battery carousel in the proper orientation.
The carousel is clearly marked as to which end should be left facing out when
you drop it into the transmitter. Ensure that once the batteries have been
installed, you can see the text "THIS END OUT" on the side of the battery
holder that is facing outward.
Standard Transmitter Pulses on the Receiver's Display
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