Reno A&E BX Series Operating Instructions

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.
A = 6 ft 9 ft 12 ft 15 ft
C = 3 ft 4 ft 4.5 ft 5 ft 5.5 ft
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.
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
1
1/8" to 1/4" SAW SLOT
3
THE WIRE IS
CONTINUOUSLY WOUND
IN THE LOOP SAW SLOT
FOR THE REQUIRED
NUMBER OF TURNS (2
turns shown)
turn 2
turn 1
FEEDER SLOT
Recommended Loop Wire: Reno LW-120 for 1/8" slots
Reno LW-116-S for 1/4" slots
Model BX Operating Instructions 09-05-01.doc
SLIDE GATE
A
A = Loop dimension parallel to the gate
18 ft 21 ft
6 ft
B = Loop dimension perpendicular to the gate
C = Distance of the loop from the gate
ROAD SURFACE
6 SEALANT
5
BACKER ROD
1" piece
spaced about
every 1'
REMOVE SHARP
INSIDE CORNERS
LOOP WIRE
3 TURNS
THE WIRES MUST BE
TWISTED TOGETHER
6 TWISTS PER FOOT
FROM THE END OF
THE SAW CUT TO
THE DETECTOR
4
END OF SAW CUT
4
RENO A&E P/N 551-2900-00
Engineering Excellence!
C
O P E R A T I N G
B
SINGLE CHANNEL LOOP DETECTORS
I

General

Please verify source voltage before applying power. The model designations indicate the
input power required for each detector as follows:
Model
Voltage
Each detector is factory configured for either Fail-Safe or Fail-Secure operation (see unit side
label).
Relay
SAW SLOT
2
II

Indicators and Controls

Status
MIN
1"
Flash
Note: If the supply voltage drops below 75% of the nominal supply voltage, the
power LED will turn off, providing a visual check of low supply voltage. Model BX
detectors operate with supply voltage as low as 70% of nominal supply voltage.

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
Reno A & E
4655 Aircenter Circle
Reno, NV 89502-5948 USA
Telephone: (775) 826-2020
Fax: (775) 826-9191
Website: www.renoae.com
E-mail: contact@renoae.com
I N S T R U C T I O N S
Model BX Series
BX-3 BX-7
120VAC 24VAC 240VAC
Fail-Safe
Power Failure Loop Failure
A Call Call
B No Call No Call
PWR Power LED DET Detect LED
Off No power or low power Output off
On Normal power to detector Output on
4 Hz - 2 second timing
N/A
delay
0 1 2
∆L/L
1.28% 0.64% 0.32% 0.16%
F O R
BX-8 BX-23 BX-24
12VDC 24VDC
Fail-Secure
Power Failure Loop Failure
No Call No Call
No Call No Call
FAIL LED
Loop OK
Open Loop
1 Hz – Shorted Loop
3 Hz - Prior Loop Failure
3 4 5 6 7
0.08% 0.04% 0.02% 0.01%