Wholesaler Dual Channel Loop Detector With Good Quality Loop Sensor
Wholesaler Dual Channel Loop Detector
Wholesaler Dual Channel Loop Detector With NC/NO output. If you want to choose NC or NO. you need to inform us when we start to produce it. There are toroidal coil type, square coil type, ultrasonic type, video type and so on. From the point of view of cost performance and high reliability, the most used one is still a toroidal coil type vehicle detector. TThe toroidal coil type vehicle detector has two kinds of box type and card type. It mainly consists of a regulated power supply, an oscillating coil, a logic circuit, a microprocessor, an interface, and a driving circuit, a signal output circuit, an induction coil, etc., as shown in the following figure. .The oscillating coil is ring-shaped, the coil cable is AC/DC low-impedance 12# or 14#AWG wire, the wire is composed of 1.5 square millimeters, 7×0.5 mm soft copper wire, plus the feeder, the wholesaler dual channel loop detector inside was relay output. The oscillator consisting of a fixed capacitor C and a ring-shaped coil inductor L and a triode, the output of the positive cyclone wave, whose frequency is determined by the loop coil inductance L. From the perspective of the oscillator, the magnitude of the inductance L of the toroidal coil, considering the eddy current effect, depends not only on the inductance of the toroidal coil, but also on the distance between the size of the ferromagnetic object opposite the coil. When the distance between the ferromagnetic object and the coil is reduced, the eddy current effect on the surface of the ferromagnetic object increases, the inductance of the oscillating circuit becomes larger, and the frequency of the oscillator decreases.
Coil spacing when the two coils are close together and connected to different vehicle detectors, their parallel spacing should be at least 2 meters apart. When they are not in the sale plane, the spacing can be reduced to 1 meter. When multiple coils are connected to the same multi-channel vehicle detector, the dual channel loop detection can avoid crosswalk between them by frequency adjustment, a feature that can be used for direction determination. When used for this function, the maximum distance allowed between the two coils is 1 meter to ensure that the vehicle can straddle the two coils simultaneously the direction of travel. Dual-Way Loop Detector/ Dual Channel Loop Detection/ Wholesaler Loop Detector.
The range is generally for a single-turn coil, the inductance on the circumference is 1.5 uH per meter, and the 3-turn coil is 9.3 uH per meter. The twisted pair feeder has an inductance of 0.6uH per meter. Allowable feeder lengths. It is worth noting that long feeders may reduce the sensitivity of the detector, so the feeder length should be minimized. The two feeders should be twisted together to reduce radiated interference between the feeders and, if possible, shielded cables are generally used as feeders. The total length of the feeder should generally not exceed 350 meters. In order to improve the wholesaler dual channel loop detector sensitivity, the inductance of the coil should be larger than the inductance of the feeder. Therefore, for the case of small coil long feeder, the number of turns of the coil should be increased.