914The following programmable f unctions shall be available to the user via front of unit

715.42.5 Traffic Detectors:

715.42.5 1-General Design Requirements: The following are minimum design and

operating requirements for all types of traffic detector units. The general design requirements apply to both the loop detectors and the magnetic probe detectors. Detector units within a traffic -actuated system shal l be completely compatible with the control units in that system. The detector units described shall be used in conjunction with pre -timed fixed cycle traffic signal controllers, solid -state traffic actuated signal controllers and traffic adjusted master system signal controllers. The detector circuitry shall be solid state and all component parts shall be of high quality meeting the maximum acceptable standards of good engineering practices. All components shall be amply derated with regard to heat diss ipating capacity and rated voltage so that, with maximum ambient temperature and maximum applied voltage, material shortening of life or shift in values shall not occur. Any component called for by the circuit design which has special or unique characteri stics which would limit that component to certain manufacturers or suppliers shall be so indicated in the manufacturer's installation, operation and service instructions. The detectors shall be capable of sensing both passage and presence of vehicles and shall not be affected by rain or other weather conditions. It shall be possible to change from passage to presence detection by a selector switch mounted on the outside of the detector unit case. The passage or presence of a vehicle over a road sensor sh all activate an output relay. The pulse detection mode shall provide a short output signal for each vehicle entering the roadway sensor zone of detection. 915 The presence detection mode shall provide a vehicle presence output signal for as long as a vehicle is stopped in the roadway sensor zone or as otherwise specified. The detectors shall be designed "fail safe." In case of power failure, the output relay shall remain in the closed position. All detector units shall be designed to operate from a 120 volt (plus or minus 10 percent (10%) ), 60 Hz, AC power line service. The detector units shall be completely self -contained and shall include an integral, fused power supply. The detector chassis shall be enclosed in a removable, sturdy aluminum or other non-corrosive metal case. The case shall furnish the chassis protection from moisture and other ambient conditions. The detector shall be of such a size as to readily fit into a cabinet with the signal controller when so required. All electrical connect ions to and from the detector unit shall be made through a multiterminal, quick disconnect, plug -type connector and wiring harness. Each wiring harness shall be at least thirty -six (36) inches long. The harness end opposite the connector shall have color -coded leads or labeled sleeves. The harness connection shall be such that the detector may be replaced with a similar unit, without the necessity of disconnecting and reconnecting individual wires leading therefrom. If the detector is mounted in the same cabinet with signal control equipment, all harness connections except power supply and vehicle call to controller shall be made on a separate terminal strip mounted in the controller cabinet for that purpose. Power supply connection and a vehicle call to controller may be connected to terminals on the controller back -panel. A front panel light, clearly visible under full daylight conditions, shall be provided to indicate when a vehicle is in the detection area. An instruction manual and an internal wiri ng schematic drawing shall be provided with each detector to facilitate installation, operation and service of the units. The Contractor or equipment supplier shall turn over to the Division any guarantee or warranties which are given by the equipment man ufacturer as a normal policy. NOTE: The above general design requirements do not apply to audible pedestrian detectors. Audible pedestrian push buttons are covered in 715.42.5.4.

715.42.5 2-Loop Traffic Detectors (LPS): The purpose of this section is to set forth

functional specifications and design requirements for a solid state digital, automatically tuned and completely self -contained, shelf -mounted unit for detecting the passage or presence of vehicles when connected to a wire loop embedded in the roadway surface. The general design requirements in 7l5.42.5.l and NEMA standards shall apply except when the specific requirements exceed those in 7l5.42.5.l and NEMA. The detector shall respond only to vehicles either stopped in or passing over any po rtion of the roadway loop. The unit shall be capable of driving loops of various sizes and configurations within a range of 30 -1,000 microhenries. It shall be capable of tuning loops of up to 50 feet in length with up to 1,000 feet of lead -in wire. The detector shall be capable of detecting vehicles traveling at any speed between zero and 100 mph. Individual sensor -detector assemblies shall operate satisfactorily under conditions where adjacent sensors are located within 6 feet of each other. The follo wing minimum controls or equivalent shall be provided on the front panel of the detector.