F
ILE
: M
ODEL
BX-LP O
PERATING
I
NSTRUCTIONS
05-31-01.
DOC
4
L o o p I n s t a l l a t i o n
The vehicle detection characteristics of the inductive loop detector are greatly influenced by the loop size and
proximity to moving metal objects such as gates. Vehicles such as small motorcycles and high-bed trucks can
be reliably detected if the proper size loop is selected. If the loop is placed too close to a moving metal gate, the
detector may detect the gate. The diagram below is intended as a reference for the dimensions that will
influence the detection characteristics.
General Rules
1. The detection height for a loop is 2/3rds the shortest leg (A or
B) of the loop. Example: Short leg = 6’ then Height = 4’.
2. As leg A is made longer, distance C will need to increase.
3. For reliable detection of small motorcycles, legs A and B
should not exceed 6 feet.
L o o p I n s t a l l a t i o n - S a w C u t T y p e
1
Mark the loop layout on the pavement. Remove sharp inside corners that can damage the loop wire insulation.
2
Set the saw to cut to a depth (typically 2" to 2.5") that insures a minimum of 1" from the top of the wire to pavement surface.
The saw cut width should be larger than the wire diameter to avoid damage to the wire insulation when placed in the saw
slot. Cut the loop and feeder slots. Remove all debris from the saw slot with compressed air. Check that the bottom of the
slot is smooth.
3
It is highly recommended that a continuous length of wire be used to form the loop and feeder to the detector. Loop wire is
typically 14, 16, 18, or 20 AWG with cross-linked polyethylene insulation. Use a wood stick or roller to insert the wire to the
bottom of the saw slot (do not use sharp objects). Wrap the wire in the loop saw slot until the desired number of turns is
reached. Each turn of wire must lay flat on top of the previous turn.
4
The wire must be twisted together a minimum of 6 twists per foot from the end of the saw slot to the detector.
5
The wire must be held firmly in the slot with 1" pieces of backer rod every 1 to 2 feet. This prevents the wire from floating
when the loop sealant is applied.
6
Apply the sealant. The sealant selected should have good adhering properties with similar contraction and expansion
characteristics to that of the pavement material.
O P E R A T I N G I N S T R U C T I O N S F O R
Model BX-LP Series
LOW POWER LOOP DETECTOR
I. General
Please verify source voltage before applying power.
The model designations indicate the
input voltage required for each detector as follows:
Relay
Solid State
Model BX-LP
BX-LP-24
BX-LP-SS
BX-LP-SS-24
Input
Voltage 9-15VDC 20-34VDC 8-26VDC 8-34VDC
Output Ratings
10A, 150VDC, 300VAC, 180W
3.9 A at 10VDC
Current Draw
1.1 - 5mA in NO DETECT
~ 30 mA in DET or Fail-Safe
1.1 – 5mA with outputs ON or OFF
(See Sensitivity section)
Note: Both the relay and solid state versions of the BX-LP consume 1.1 to 5.0 mA of current when the outputs
are OFF. Current draw in NO DETECT state is shown in the table under Sensitivity Level Rotary Switch.
Output
Fail Safe, Loop Failure
Fail Secure, Loop Failure
A Output
ON
Output
OFF
B
Output OFF
Output OFF
II.
Indicators and Controls
Status
DET Detect LED
FAIL LED
Off
No vehicle present or 3 minutes expired
Loop OK
On
Vehicle present over loop
N/A
Flash
4 Hz - timing 2 second delay
1 flash/second - Failed Loop
1 flash/5 seconds - Intermittent Loop Failure
Note: The DET LED automatically deactivates 3 minutes after power-up or reset to conserve power.
Sensitivity Level Rotary Switch
The 8-position rotary switch selects one of eight sensitivity levels as shown below. 0 is lowest and
7 is highest, with normal (factory default) being 3. Use the lowest sensitivity setting that detects
the desired vehicles.
Position
0
1
2
3
4
5
6
7
∆
L/L
1.28% 0.64% 0.32% 0.16% 0.08% 0.04% 0.02% 0.01%
mA
Draw 1.1mA 1.3mA 1.5mA 2.5mA 3.0mA 3.5mA 3.5mA 5.0mA
Telephone: (775) 826-2020
Facsimile: (775) 826-9191
Internet: www.renoae.com
e-mail: [email protected]
A =
6 ft
9 ft
12 ft
15 ft
18 ft
21 ft
C =
3 ft
4 ft
4.5 ft
5 ft
5.5 ft
6 ft
Reno A&E
4655 Aircenter Circle
Reno, Nevada 89502
U.S.A.
Engineering Excellence!
1
3
1/8" to 1/4" SAW SLOT
THE WIRE IS
CONTINUOUSLY WOUND
IN THE LOOP SAW SLOT
FOR THE REQUIRED
NUMBER OF TURNS (2
turns shown)
turn 2
turn 1
REMOVE SHARP
INSIDE CORNERS
FEEDER SLOT
END OF SAW CUT
4
THE WIRES MUST BE
TWISTED TOGETHER
6 TWISTS PER FOOT
FROM THE END OF
THE SAW CUT TO
THE DETECTOR
Recommended Loop Wire: Reno LW-120 for 1/8" slots
Reno
LW-116-S
for
1/4"
slots
ROAD SURFACE
MIN
1"
SAW SLOT
SEALANT
BACKER ROD
1" piece
spaced about
every 1'
LOOP WIRE
3 TURNS
2
6
5
LOOP PERIMETER NUMBER OF TURNS
10 feet - 13 feet
4
14 feet - 26 feet
3
27 feet - 80 feet
2
81 feet and up
1
A
B
C
A = Loop dimension parallel to the gate
B = Loop dimension perpendicular to the gate
C = Distance of the loop from the gate
SLIDE GATE
