Parking Management System Improve Efficiency Factory Supply Double Channel Vehicle Loop Detector PD-232

PRODUCT INTRODUCTION

This loop detector is a dual microprocessor based detector designed specifically for parking and vehicle access

control applications.The primary function of the detector is to detect vehicle presence by means of an inductance

change caused by the vehicle passing over a wire loop buried under the road surface.

Technicial specifications

PRODUCT FEATURES

1) Reset Switch:The reset switch enables the detector to be manually reset during registering and testing

and it is a process of system recovery

2) Selectable Pulse Time:This feature sets the length of time that the pulse relay will be lasting for 1S or 0.5

Seconds

3) Pulse Relay Selection:The Pulse Relay may be configured to activate on detection of a vehicle or when

the vehicle leaves the loop

4) Sensitivity Reinforcement:This feature sets the un-detecting level to a maximum sensitivity to prevent

failing to detect vehicles as big trucks

5) Switch Sensibility Adjustable:4 sensitivity setting are available on the switches to change sensitivity

6) Switch Frequency Adjustable:4 frequency settings are available to prevent signal interference with

neighboring loops

7) Filtering Option:This option is used to provide a delay between detection of the vehicle and switching

of the output relay. This relay is normally used to prevent false detection of small or fast moving objects

8) Permanent Presence Option:This feature ensures the detection of the vehicle will be maintained when

the vehicle stays within the loop area for extended periods

INSTALLATION & USER GUIDE
The detector must be installed in a convenient weatherproof location as close to the loop as possible.
WARNING:
1) Installation and operation by service personnel only,
2) Disconnect power before working on this unit.
A correct loop configuration and detector installation will ensure a successful inductive loop detection system.

OPERATIONAL CONSTRAINTS
Crosstalk
When two loop configurations are in close proximity, the magnetic field of one can overlap and disturb the field of the other.

This phenomenon, known as crosstalk, can cause false detects and detector lock-up. Crosstalk can be eliminated by:
a. Careful choice of operating frequency. The closer together the two loops, the further apart the frequencies of operation must be.
b. Where possible, a minimum spacing of 7 feet between loops should be adhered to.
c. Careful shielding of feeder cables if they are routed together with other electrical cables. The shield must be earthed at the detector
end only.

Reinforcing
The existence of reinforced steel below the road surface has the effect of reducing the inductance, and therefore the sensitivity

of the loop detection system. In this case, two additional turns of wire should be added to the loop.

The ideal spacing between the loop cable and steel reinforcing is 6 inch, although this is not always practically possible.

The slot depth should be kept as shallow as possible, taking care that no part of the loop or feeder remains exposed after

the sealing compound has been applied.

INSTALLATION INFORMATION
Loop and Feeder Specification
The loop must consist of insulated wire with a minimum copper cross-sectional area equivalent to 1.5 square millimeters. The feeder
should be of the same material, but twisted, a minimum of 20 twists per meter.
Joints in the loop or feeder are not recommended. Where this is not possible, joints are to be soldered and terminated in a waterproof
junction box. This is extremely important for reliable detector performance.
Where long loop feeders are used, or feeders are routed together with other electrical wiring, the use of a screened cable is suggested for
the feeder. The screen must be earthed at the detector end only.

Double channel loop detector PD232 datasheet.pdf