AS 2703-1987

1 - AS 2703-1987 VEHICLE LOOP DETECTOR SENSORS
4 - PREFACE
5 - CONTENTS
6 - SECTION 1. SCOPE AND GENERAL
6 - 1.1 SCOPE.
6 - 1.2 REFERENCED DOCUMENTS.
6 - 1.3 DEFINITIONS.
6 - 1.3.1 Actuation
6 - 1.3.2 Counting rate
6 - 1.3.3 Detection zone
6 - 1.3.4 Feeder cable
6 - 1.3.5 Independent detector
6 - 1.3.6 Initial inductance
6 - 1.3.7 Interaction (crosstalk)
6 - 1.3.8 Limited presence detector
6 - 1. 3.9 Loop
6 - 1.3.10 Occupancy
6 - 1.3.11 Output
6 - 1.3.12 Paralysis time
6 - 1.3.13 Passage detector
6 - 1.3.14 Presence detector
6 - 1.3.15 Presence time
6 - 1.3.16 Q-factor
7 - 1.3.17 Rack-mounted detector
7 - 1.3.18 Recovery time
7 - 1.3.19 Response time (turn-on-time)
7 - 1.3.20 Sensitivity
7 - 1.3.21 Sensor unit (channel)
7 - 1.3.22 Turn-off time (for presence detectors and limited presence detectors)
7 - 1.3.23 Vehicle loop detector
7 - 1.3.24 White noise
8 - SECTION 2. MECHANICAL AND PHYSICAL REQUIREMENTS
8 - 2.1 CONSTRUCTION.
8 - 2.2 OVERALL DIMENSIONS.
8 - 2.2.1 Single-channel independent sensor units.
8 - 2.2.2 Multi-channel independent sensor units.
8 - 2.2.3 Rack-mounted sensor units.
8 - 2.3 MARKING.
8 - 2.4 PROVISION OF INFORMATION.
9 - SECTION 3. ELECTRICAL REQUIREMENTS
9 - 3.1 POWER SUPPLY.
9 - 3.1.1 Independent sensor units.
9 - 3.1.2 Rack-mounted sensor units.
9 - 3.2 PROTECTION.
9 - 3.3 ELECTROMAGNETIC RADIATION.
9 - 3.4 INDICATOR.
9 - 3.5 SWITCHES AND ADJUSTMENT FACILI-TIES.
9 - 3.5.1 General.
9 - 3.5.2 Sensitivity control.
9 - 3.6 CONNECTION FACILITIES FOR INDEPENDENT SENSOR UNITS.
9 - 3.6.1 Types of connection.
9 - 3.6.2 Single connector.
9 - 3.6.3 Separate LV and ELV connectors.
9 - 3.6.4 Provision of connecting leads.
9 - 3.7 CONNECTION FACILITIES FOR RACK-MOUNTED SENSOR UNITS
10 - 3.8 RELIABILITY.
11 - SECTION 4. OPERATIONAL PERFORMANCE
11 - 4.1 BASIS FOR SPECIFIED PERFORMANCE.
11 - 4.2 INDUCTANCE RANGE.
11 - 4.3 MINIMUMACTUATION.
11 - 4.4 MAXIMUM ACTUATION.
11 - 4.5 RESPONSE TIME.
11 - 4.6 TURN-OFF TIME.
11 - 4.7 RECOVERY TIME.
11 - 4.8 PRESENCE TIME.
11 - 4.9 PARALYSIS TIME.
11 - 4.10 PASSAGE DETECTOR OUTPUT.
11 - 4.11 OUTPUT CHARACTERISTICS.
11 - 4.11.1 Types of output.
11 - 4.11.2 Delay output.
11 - 4.11.3 Solid-state output.
12 - 4.12 AUTOMATIC DRIFT COMPENSATION (TRACKING)
12 - 4.13 INTERRUPTION OF ELECTRICITY SUPPLY
12 - 4.14 FAILURE MODE.
12 - 4.15 SURGE PROTECTION.
12 - 4.16 VARIATION IN OPERATING CONDITIONS.
12 - 4.17 SUSCEPTIBILITY TO INTERFERENCE.
12 - 4.18 INTERACTION (CROSSTALK).
12 - 4.19 LEAKAGE TO EARTH.
14 - APPENDIX A - PERFORMANCE CHARACTERISTICS OF VEHICLE LOOP DETECTORS
14 - A1 SCOPE.
14 - A2 RESPONSETIMES.
15 - A3 RECOVERY TIME.
15 - A4 PRESENCE TIME.
16 - A5 PARALYSIS TIME.
17 - APPENDIX B - SUGGESTED TYPE TESTS FOR CHECKING OPERATIONAL PERFORMANCE
17 - B1 SCOPE.
17 - B2 TEST APPARATUS.
17 - B2.1 Apparatus required.
17 - B2.2 Variable frequency oscillator.
17 - B2.3 Power supply.
18 - B2.4 Vehicle loop simulator.
18 - B2.5 Vehicle simulator.
18 - B2.6 Second vehicle simulator.
18 - B2.7 Interference source.
20 - B2.8 Counters.
20 - B2.9 Oscilloscope.
20 - B2.10 Environmental chamber.
21 - B3 CALIBRATION AND PRE-CONDITIONING.
21 - B4 TEST PROCEDURES AND CRITERIA.
21 - B4.1 Testing of multi-channel detector sensors.
21 - B4.2 Test for inductance range and normal operation.
21 - B4.3 Test for minimum and maximum actuation, response time and counting reliability.
21 - B4.4 Test for response time and turn-off time.
22 - B4.5 Test for presence time and/or paralysis times.
22 - B4.6 Test for supply failure and loop failure.
22 - B4.7 Test for automatic drift compensation (tracking).
22 - B4.8 Test for susceptibility to interference.
23 - B4.9 Test for interaction (crosstalk).
23 - B4.10 Test for leakage to earth.
23 - B4.11 Test for variation in operating conditions.
24 - APPENDIX C - RECOMMENDED ROUTINE TESTS FOR CHECKING OPERATIONAL PERFORMANCE
24 - C1 SCOPE.
24 - C2 SENSITIVITY TEST FOR PASSAGE DETECTORS.
24 - C3 SENSITIVITY TEST FOR PRESENCE DETECTORS.
24 - APPENDIX D - INFORMATION TO BE SUPPLIED WITH ENQUIRY OR ORDER

Specifies requirements for the design, construction and performance of electronic sensing equipment used in traffic control and counting systems for the detection of vehicles. It applies primarily to detector sensors of the permanently installed type associated with road traffic signal installations.

This Standard specifies requirements for the design, construction and performance of vehicle loop detectors. The requirements apply primarily to detectors of the permanently installed type associated with road traffic signal installations.NOTE: See Appendix D for the information which should be supplied with an enquiry or order for vehicle loop detectors to this Standard.