JAMAR Technologies TRAX I, Руководство пользователя

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TRAX I User’s Manual
3-2
Installing Road Tube
Proper road tube installation is very important for collecting accurate data
with your TRAX I. The road tube and the TRAX I’s air switches comprise
the sensing device for the unit. As with all receivers, the sensor has to be
functioning properly to record reliable information. With this in mind, ex-
amine your installations carefully and be absolutely certain that your unit
is recording data as programmed. The following in-
stallation instructions cover round tube (.25 inside
diameter (ID) by .60 outside diameter (OD)), and
mini-tube (.187 ID by .365 OD). These directions
will assist you in placing your road tubes correctly
on the road surface with confidence and a minimum
of effort.
Tube Length
Tube length is very critical in order to record accurate vehicle data.
The following guidelines should be followed for all studies regardless
of simplicity. The lengths listed for each study below have shown to
provide the best results based on extensive testing.
L1, L3, L4, L5, L6, L7, L9, L10 (Long tube setups)
To encompass all types of vehicles and speeds, a tube length of
sixty (60) feet is recommended for round tube, fifty (50) feet for
mini tube. These lengths should satisfy all requirements for nor-
mal street, road, highway and interstate traffic patterns.
L2, L8, L11, L12 (Short tube, long tube setups)
To ensure the pulses from the road tubes arrive at the counter in the
proper order, the tube length must be the same from the edge of the
road to the TRAX I. This will ensure that the pulse from the short
tube arrives before the pulse from the long tube.
Example: You are using mini tube to install an L11 layout across
two lanes of traffic and each lane is twelve feet wide. In order to
ensure that the distance the air pulse has to travel from the edge of
the road to the counter is the same for all tubes, you should use 38
feet for the short tubes (A & C) and 50 feet for the long tubes (B &
D). The short tubes will be installed over only one lane (12 feet),
leaving 26 feet of tube back to the TRAX I. The long tubes will be
Actual Size
Round
Tube
Mini
Tube