12
Sensitivity
Six sensitivity settings are available using the 3-position front
panel slide switch and DIP switch 1 on the back panel.
(Refer to the diagram on the previous page.)
SW1 = OFF (to the number side)
SW1 = ON (to the ON side)
At the above switch settings, the front panel slide switch posi-
tions yield the following sensitivities:
SW1 = OFF
SW1 = ON
Max = 0.04%
Max = 0.02%
Med = 0.16%
Med = 0.08%
Min = 0.64%
Min = 0.32%
The above sensitivities are for the detect threshold when a
vehicle enters the loop. The detector has a SENSITIVITY
BOOST facility in which the drop sensitivity decreases to half
its numerical initial value (except the 0.02 setting.)
Always operate the detector on the lowest sensitivity possible
while still detecting the desired vehicles. Construct the loop for
your specific job. Remember, the smallest side of the loop will
determine how high off the ground you will be able to detect a
vehicle. Your loop will have an effective field at a height equal
to 1/2 to 2/3rds of the size of the smallest side of the loop.
Example: A 6’x6’ loop has a smallest side of 6’, therefore your
detector can reliably see a vehicle at 3’ to 4’ above the loop
wires. A 6’ x 3’ loop has a smallest side of 3’, so your detector
will reliably see a vehicle up to 1½’ to 2’ above the loop wires.
Also remember, your loop will sense metal off to the sides,
although not from as far as directly above the loop. Do not
install the loop too closely to any moving metal. The detector
does not know the difference between a vehicle and a metal
door or gate. Keep your loop far enough away from any mov-
ing metal to avoid false detections, approximately 4’ at least.
