Products : Traffic

TD424E

The TD424E is a 4 channel, microprocessor-based card detector complying to Eurocard standards. Features incorporated on this model make it an invaluable component in urban intersection control.

APPLICATIONS

· Stopline Detection
· Determination of vehicle headway
· Calculation of vehicle occupancy
· Accurate high-speed vehicle count

Features of the TD424

· Optimised Response Times:

Response times are optimised to facilitate the measurement of accurate vehicle presence data.

· Optimised Sensitivity:

Sensitivity levels are adjustable for each channel.
These have been carefully chosen for traffic control
applications allowing adjacent lane rejection and
elimination of interference.

· Adjustable Presence Time:

A range of four presence times is available and adjustable for each channel. This facilitates operation in passage mode, limited presence or for
queue detection.

· Loop Fault Monitor:

The TD424E provides local and remote fault output indications on an individual channel basis as required

· Sequential Polling:

Scanning techniques are employed to positively eliminate crosstalk between loops connected to the same detector module.

Using the TD424 in Intersection Control

Technical Data TD 424E


Self-tuning Range:	20– 1000 µH
Sensitivity:	Four step adjustable on faceplate High 0.02%L/L Med-High 0.05% L/L Med-Low 0.1% L/L Low 0.5% L/L
Frequency:	Four step selectable on PCB 10khz - 140 khz (Frequency dependent on loop per channel)
Output Configuration:	One presence output per channel
Presence Time:	Four step adjustable on faceplate 1 second 4 minutes 35 minutes Limited by %L/L
Response Times:	Turn on 52mS ± 2.4 mS Run off 52mS ± 2.4 mS Recovery ± 80 mS
Fault Outputs:	Common open collector operates under the following conditions: Loop short/open circuit
Indications:	The following indications are provided: 2 LED per channel 1 Red Detect 1 Red Fault
Protection:	Loop isolation transformers, zener diode clamping on loop inputs and gas discharge tube protection.
Power Requirements:	24V DC (+20%) Requirement 1.8 VA (max) @ 24V DC
Output:	50mA @ 50V DC
Operating Temp Range:	-40°C to +80°C (Circuit conformally coated)
Mechanical Details :	Standard Eurocard
Dimensions:	160mm (deep) x 100mm (high)
Faceplate:	25mm wide
Connector:	2 x 16 pin card edge (DIN 41612 type C) Option: 2 x 32 pin card edge (DIN 41612 type B)