There are a number of ways to detect vehicles and inductive loop technology is the most reliable, bar none. ZHM offers Loop based vehicle detector systems that allow for better traffic control.
The loop vehicle detector system consists of three components: a loop (preformed or saw-cut), loop extension cable and a detector.
OUTPUTS:
STANDARD - RELAY
5 Normally closed contact, relay energized on power up and released on detection of vehicle (fail-safe output, on power failure, open circuit or short circuit of loop).
LED Indications
OPERATING TEMPERATURE RANGE: 0°C - 70°C
SUPPLY: 12 ± 1 V DC
INDUCTANCE RANGE: 20 – 2000 mH (AUTOMATICALLY TUNED)
FAIL SAFE OPERATION:
A permanent detection output will be given in the event of open circuit loop short circuit loop or power failure (relay output). The detector resumes normal operation as soon as it sees an "in range "inductance, except in the case of a short circuit close to its terminals, then the fault will be permanently latched and that channel will be skipped in the detector scan. The detector will also self heal following an excessively large inductance change by re-tuning itself to the new inductance.
MODES:
Each channel can be individually set to either presence or passage in presence mode, a detection output is given whilst a vehicle is present. In passage mode, a pulse output (100ms to 135ms) is given on vehicle entry. Further outputs are inhibited for 2 seconds unless the loop is fully cleared.
FREQUENCY:
Crosstalk between four channels of one unit cannot occur. Should crosstalk occur between channels on two different units a frequency selection jumper is provided to set high or low frequency.
CHANNEL OFF:
Each channel can be disabled by putting all switches on that channel as skipped in a scan sequence.
RESET:
A reset push button is provided. Whenever switch settings are changed or retuning is required press the reset button. All switches are read by the controller inON Power,ONReset or Manual Reset modes.
Video based vehicle detection technology is an integral part of the ZHM Intelligent Transportation System (ITS) portfolio, due to its non-intrusiveness and comprehensive vehicle behavior data collection capabilities.
ZHM offers its customers high end Video based Vehicle detection systems to have a centralized management console to regulate traffic and clear bottlenecks
FEATURES
