LOOP DETECTOR

Posted on June 26th, 2010 by Ron Gibson


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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



29 Responses to “LOOP DETECTOR”

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  4. Ron Gibson Says:

    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/

  5. johnhaward Says:

    Interesting blog. It would be great if you can provide more details about it. Thanks a lot!

  6. Andy Smith Says:

    We will be posting a new blog for the loop detector phenomena. We always welcome your suggestions on our blog. Thanks..

  7. Ron Gibson Says:

    Thanks for appreciation. yeah, I will provide more indepth knowlwdge on the Loop Detector in few days.

  8. Ron Gibson Says:

    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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  10. Ron Gibson Says:

    It good that you found the blog informative, Thanks a lot for your word of apreciation. Apart from that, thanks for bookmarking. I’ll keep on posting such informative stuffs, keep visiting the blogs..
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  12. Ron Gibson Says:

    Your Welcome Dear.

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    Thanks for appreciation Buddy. I am just sparpening my skills and trying my best. thanks again. keep posting comments..

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    Thanks for appreciation Buddy..

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