LOOP DETECTOR
Are you bored of coming out of car for opening the gate door ??, now onwards forget about that. This Automatic Guard Gate System can open the Gate for you just after perceiving your vehicle. This excellent feature of sensing vehicle is provided by Digital Loop Detector.
PRINCIPLE OF LOOP DETECTOR:
With Loop Detector an Inductive loop is used. An inductive loop is simply a coil of wire embedded in the road’s surface. Inductive loops work by detecting a change of inductance.
The capacity of an inductor is controlled by two factors:
- The number of coils
- The material that the coils are wrapped around (the core)
Putting iron in the core of an inductor gives it much more inductance than air or any other non-magnetic core would. The inductance will be much larger because of the large steel object positioned in the loop’s magnetic field. The car parked over the coil is acting like the core of the inductor, and its presence changes the inductance of the coil. The loop is part of an oscillator circuit. The oscillator is held just on the verge of oscillation via AGC. When a car enters the loop it “dampens” the loop by absorbing energy, and the oscillation decreases or stops entirely.
LOOP DETECTOR:
DIGITAL LOOP DETECTOR SPECIFICATIONS
Inductance range : 18 to 1800 micro henries automatically tuned
Frequency range : 10 to 97 KHz
Temperature range : -40°C to +85°C
Outputs : Presence and relay 2 are change over relay contacts rated at 250VAC, 5A, 150W/600VA max.
Lightning and : Zener diode protection from over voltage induced on loop and feeder leads. Flash Transient Protection over protection from loop to earth. Protection exceeds NEMA specification.
Supply Power : 120 or 24VAC, 12 or 24VDC
Loop fault indications : If the 625X sees a loop fault (open loop, shorted loop or greater than a 25% inductance change), the presence LED will flash at a 16Hz rate. If the fault condition corrects itself, the presence LED and detector will resume normal operation. The historic fault can be displayed by depressing the reset button for less than three seconds. The presence LED will flash at 16Hz rate to indicate a fault had occurred. When the reset button is released, detector will resume normal operation within three seconds.
Presence time : 60 minutes standard.
Presence time options : 8 minutes, 16 minutes or permanent
Dimensions : 3”H x 1.5”W x 3.5”L excluding connector
July 7th, 2010 at
Being a new blogger, I would like to tell you that you have given me much knowledge about it. Thanks for everything.
Mr.parts tools
July 10th, 2010 at
I adore your blog – nice work!
July 10th, 2010 at
I your blog – great effort!
July 13th, 2010 at
Welcome, My Pleasure..
Let me tell you one more thing that, Loop Detector is more or less based on the Mechanism of Relay. Relay is the main Switch which operates or controls the Gate.
For more information about Relay please visit below mentioned link.. Thanks.
http://iwatchsystems.com/technical/2010/06/30/relay/
July 17th, 2010 at
Interesting blog. It would be great if you can provide more details about it. Thanks a lot!
July 17th, 2010 at
We will be posting a new blog for the loop detector phenomena. We always welcome your suggestions on our blog. Thanks..
July 17th, 2010 at
Thanks for appreciation. yeah, I will provide more indepth knowlwdge on the Loop Detector in few days.
July 17th, 2010 at
Thanks for your appreciation. In few days I will be providing the construction and the working of Loop Detector along with the setup of IP based Control Panels including circuit diagrame.
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