MAGNETIC DETECTOR CARDS - Item No.
Special Provision No. 682S31
1.
February 2009
SCOPE
This Special Provision covers the requirements for the installation and testing of magnetic detector cards,
which have been specifically designed to function with magnetic detectors, specified under a separate item, as
well as associated software required for serial based configuration and real-time monitoring functionality.
2.
REFERENCES
This Special Provision refers to the following standards, specifications or publications:
Ontario Provincial Standard Specifications, Construction:
OPSS 622 Installation of Traffic Signal Controllers
Ministry of Transportation Publications:
Ontario Traffic Signal Control Equipment Specifications (OTSCES)
National Electrical Manufacturers Association:
NEMA TS2
Traffic Controller Assemblies with NTCIP Requirements
Electronic Industries Alliance / Telecommunications Industry Association:
EIA/TIA-232-E
Interface Between Data Terminal Equipment and Data Circuit-Terminating
Equipment Employing Binary Data Interchange. Commonly referred to as RS-232.
3.
DEFINITIONS
For the purpose of this Special Provision, the following definition applies:
Magnetic detector: means magneto-inductive detector capable of sensing fluctuations in a varying incident
magnetic flux density and converting such fluctuations into a corresponding variable inductance at its
electrical port.
Sensor: means assembly of magneto-inductive probes installed in a carrier in an under pavement conduit that,
together with home run cable and a vehicle detector card, are able to detect vehicles in a single traffic lane.
4.
DESIGN AND SUBMISSION REQUIREMENTS
4.1
Submission Requirements
4.1.1
The Contractor shall supply the specification sheets for the loop vehicle detector cards to the Contract
Administrator prior to ordering.
February 2009
Pg. 1 of 7
SSP682S31
4.1.2
Pursuant to the installation and configuration of the cards, the Contractor shall submit computer
generated graphical plots indicating successful calibration and configuration of the cards and
associated magnetic sensors to the Contract Administrator. One 8.5 x 11” sized plot for each lane that
the card monitors shall be provided, and each plot shall contain superimposed waveforms from all
magnetic sensors in the lane, with each waveform plotted in a unique colour. The waveform shall
represent change in channel inductance/frequency (or a normalized value thereof) versus time. The
scale shall be of sufficient length to include three complete vehicle detections for all magnetic sensors
in the lane.
4.1.3
The Contractor shall provide a log of the nominal inductance measurement for each channel on each
card following installation.
5.
MATERIALS
5.1
Magnetic Detector Cards
5.1.1
General
5.1.1.1 Cards shall meet the requirements of applicable Ontario Traffic Signal Control Equipment
Specifications (OTSCES) and all applicable addenda.
5.1.1.2 Cards shall meet NEMA TS2 requirements for Type 2 controller and cabinet assemblies, shall be
configured as plug-in devices and shall meet TS2 Section 3.2 requirements for actuated Type 2 A2
operation.
5.1.1.3 Cards shall be operable with both 12 and 24 VDC power supplies.
5.1.1.4 Cards shall be equipped with standard 44 contact edge connectors and pinouts as per NEMA TS2 but
meet compatibility requirements for installation in 22-lettered pin input files.
5.1.1.5. Four channels (magnetic sensor connections) shall be supported per card.
5.1.1.6 Cards shall be compatible with single, double and triple magnetic probe sets, as specified in the
Contract.
5.1.1.7 In conjunction with the magnetic probe sets and home-run cables specified in the Contract, the cards
shall be capable of detecting and holding the presence of all licensed motor vehicles within their
probes’ radius of detection, including small motorcycles, while incorporating mechanisms to exclude
vehicles in adjacent lanes.
5.1.1.8 To increase the accuracy of the vehicle count, cards shall support adjustable bridge time, which
corresponds to the minimum typical gap between vehicles in fractions of a second. The bridge time
shall be adjustable through cards’ configuration software.
5.1.1.9 The detection performance for the cards shall be maintained with home-run cable lengths up to 762m.
5.1.1.10Cards shall include sensitivity adjustments for the cards’ detection threshold on a channel by channel
basis and in a minimum of 8 incremental 2:1 steps, configurable both from the cards’ front panel and
electronically through the configuration software.
February 2009
Pg. 2 of 7
SSP682S31
5.1.1.11Cards shall have a single, switched oscillator system to sequentially excite and measure each channel
to prevent crosstalk between channels within a unit.
5.1.1.12Cards shall support the adjustment of their oscillation frequency on a channel by channel basis to
reduce the possibility of crosstalk between detector units. Frequency adjustments shall be
configurable both from the cards’ front panel and electronically through the configuration software.
5.1.1.13Cards shall have a Presence or Pulse mode output option, configurable both from the cards’ front
panel and electronically through the configuration software.
5.1.1.14Each card channel shall have measurement capability to continuously verify magnetic sensor system
integrity. The cards shall be capable of detecting faults including short circuits to ground, open
circuits or inductance changes of greater than 25% on any of their channels.
5.1.1.15Vehicle detections and faults shall be visibly relayed through front panel LEDs.
5.1.1.16Cards shall be capable of collecting and storing counts and occupancy in time bins for each channel,
which shall later be available for retrieval using the configuration software over the cards’ serial
connectivity. The cards shall be provided with sufficient memory to store vehicle count and
occupancy data in for all 4 channels on the card, in 15 minute time bins for a minimum of 36 hours.
5.1.2
Serial Communication
5.1.2.1 Cards shall support RS-232 serial communication to an external device for remote configuration and
real-time monitoring functionality. Irrespective of any rear edge connector pin based serial
connectivity, the cards shall provide a front panel DB-9, RJ-45 or Mini-DIN connector based serial
interface.
5.1.2.2 Serial baud rates shall be selectable at 1200, 2400, 4800, 9600, or 19200 bps using the configuration
software. Default factory settings for the serial link shall be indicated directly on the units or
available from the manufacturer’s documentation.
5.1.2.3 Communications cables with suitable mating connectors shall be provided with the cards for remote
serial connection to an external configuration device (notebook computer typical).
5.2
Configuration and Data Acquisition Software
5.2.1
Cards shall be microprocessor controlled and shall be configurable via both manual switch settings
and software settings held in on-board memory.
5.2.2
Microsoft Windows® XP software, along with all necessary media for reinstallation, shall be
provided with the cards to: configure detector parameters including sensitivity and frequency; map
card channels to magnetic sensors; setup communications settings; monitor hardware faults; setup onboard data recording; retrieve local data files; and to view realtime detection values.
5.2.3
The configuration software shall support optional password protection for any change of settings.
5.2.4
Additional Microsoft Windows® XP software, along with all necessary media for reinstallation, shall
also be provided which allows for the capture of detector data from all four channels simultaneously
over the card’s serial connectivity. This software shall provide the ability to plot acquired data (actual
February 2009
Pg. 3 of 7
SSP682S31
or normalized change in inductance/frequency versus time) from any or all of the card channels on a
single graph.
5.2.5
All configuration and data acquisition software shall be provided with the required licenses,
documentation and training for independent Owner operation going forward.
5.2.6
Full disclosure of all serial protocols, message types and/or software parameters for the cards’
configuration & data acquisition functionalities shall be granted to the Owner, so that the Owner may
opt to develop fully functional card central management software for the Owner’s exclusive use.
5.3
Acceptance of Alternative Product
5.3.1
For any proposed product which does not appear on the Designated Sources of Materials (DSM)
listing for this contract item, the Contractor shall submit a Change Proposal for an alternative product
according to the requirements of the MTO General Conditions of Contract for Change Proposals,
under the category of “Alternative Types of Materials or Material Sources” subject to the following
additional requirements.
5.3.2
Alternative magnetic detector cards shall be subject to a successful evaluation period of minimum 4
months duration, during which the Contractor shall demonstrate to the Owner that the alternative
product meets all requirements of this specification. The Contractor shall provide and install three
alternative magnetic detector cards into controller cabinet 400CN0065DSR (existing magnetic
detector test site at Hwy 400 SB at Finch Avenue) for the purposes of this evaluation. Two-probe,
Owner supplied magnetic detectors (6-lane detector station 400DN0059DSS) shall be used to
evaluate the alternative cards. The Contractor shall provide 48 hours advance notice to the Contract
Administrator prior to commencement of this work.
5.3.3
The Contractor shall obtain, from the Owner, 6-lane detection data for a detector station employing
IDRIS® technology adjacent to 400DN0059DSS, and shall compute the difference in counts between
the 400DN0059DSS station and the IDRIS® station on a per lane basis, for each of the following
periods to be selected by the Contractor:
(i) a single 1-hour period of midday freeflow traffic for each month of the evaluation period.
(ii) a single 1-hour period of nighttime lightflow traffic for each month of the evaluation period
(iii) a single 2-hour AM peak period for each month of the evaluation period
5.3.4
The Contractor shall then be provided with 6-lane detection data from the Owner for another adjacent
detector station which utilizes DSM listed magnetic detector cards for the periods selected, and shall
compute the corresponding difference in counts between this station and the IDRIS® station.
5.3.5
At all times the Contractor shall ensure that the data from the three detector stations utilized in the
comparison is synchronized with respect to its timebase and the Contract Administrator shall verify
and certify all data and calculations.
5.3.6
The alternative magnetic detector card evaluation shall be deemed successful only if the count
difference between the 400DN0059DSS station and the IDRIS® station is smaller or equal in
magnitude to the count difference between the DSM listed magnetic detector count and the IDRIS®
station, for each of the 6 lanes and each of the periods listed above in 5.3.3.
6.
February 2009
EQUIPMENT – Not Used
Pg. 4 of 7
SSP682S31
7.
CONSTRUCTION
7.1
Installation
7.1.1
Installation, configuration & testing of the cards shall be performed according to the manufacturer’s
recommendations.
7.1.2
The Contractor shall install the cards in accordance with the requirements of OPSS 622 and as
indicated in the contract drawings. Four channel detector cards shall be inserted into even numbered
cabinet I & J input file slots only.
7.1.3
The Contractor shall ensure that the racks are not powered up while the detector cards are being
installed.
7.2
Configuration
7.2.1
Upon connection of the magnetic sensor home-run cables to the input files in-cabinet, the Contractor
shall install the configuration software on a notebook computer and utilize the serial connectivity of
the cards for electronic calibration.
7.2.2
For sensor cards which monitor two magnetic detectors in a lead-lag configuration within the same
lane, the Contractor shall map the lead-lag loop configuration to the actual channels on the sensor
card using the software, taking into consideration the Owner’s standard input file connection
highlighted in the Contract Drawings. The Contractor shall also input the exact physical distance
between lead-lag sensors as part of this mapping.
7.2.3
The Contractor shall set any applicable noise immunity parameters available on the cards.
7.2.4
The Contractor shall set all cards to Presence mode.
7.2.5
To restrict unauthorized access, the Contractor shall set a Contract Administrator provided password
for future electronic reconfiguration of the cards.
7.2.6
The Contractor shall set the adjustable Bridge Time setting of the cards to 0.4 seconds, unless nonstandard detector duct depths or other installation practices have been employed for the associated
detector station, in which case the Contractor shall set an alternative Bridge Time which optimizes
detector performance in accordance with the manufacturer’s recommendations.
7.2.7
Utilizing the real-time activity monitoring features of the software, the Contractor shall determine the
change in inductance for each channel in the presence of a standard car, and shall program the
sensitivity value for each channel to a setting between 6.25% and 12.5% of this value.
7.2.8
The Contractor shall configure dissimilar oscillation reference frequencies for each card installed in
the cabinet input files. In general, the cards monitoring the channels with the highest inductance
(typically connected to the longest home-run cables) shall be assigned the lowest frequencies, and a
minimum frequency offset of 3 KHz (10 KHz optimal) shall be established between each of the cards.
7.3
February 2009
Testing
Pg. 5 of 7
SSP682S31
7.3.1
Utilizing the real-time activity monitoring features of the software, the Contractor shall confirm for
each channel that the nominal channel inductance shall be within ± 20% of the following summation:
magnetic detector inductance; lead-in cable inductance and home-run cable inductance.
7.3.2
The Contractor shall confirm for each channel that the change in nominal channel inductance shall be
between 120 and 1200 nanohenries when a standard car passes over the corresponding magnetic
detector.
7.3.3
Utilizing the data acquisition and plotting functions of the card software, the Contractor shall examine
the waveform for each card channel and verify that the amplitude of the peak to peak noise present on
each channel shall be no greater than one half the amplitude of the sensitivity value set by the
Contractor.
7.3.4
Utilizing the data acquisition and plotting functions of the card software, the Contractor shall verify
that the lead and lag loops in each lane produce waveforms which are approximately equal in both
shape and amplitude, albeit shifted slightly in time, when the same vehicle drives over both loops
sequentially. These waveforms shall then be submitted to the Contract Administrator for approval as
specified in Section 4.
7.3.5
Utilizing the collection and storage functionality of the cards, the Contractor shall extract 15 minutes
of binned traffic counts for each card channel. The Contractor shall then confirm that the counts
recorded for sensors in the same lane are approximately equal, notwithstanding small discrepancies
which may be attributed to lane changes.
7.3.6
The Contractor shall also confirm proper operation of the cards at the Advanced Traffic Controller incabinet using Owner supplied GRID software. Each card shall be monitored through the GRID
software for a minimum of 5 minutes, and the detection observed shall closely approximate the realtime values observable simultaneously from within the cards’ software interface.
7.3.7
Following successful calibration of the cards, the Contractor shall obtain confirmation from the
Contract Administrator that the data from the magnetic detector cards is reported at the TOC.
7.4
Quality Control
The Contractor is responsible for all testing and documentation required to establish approval and acceptance
of installation and operation of this equipment. The framework of the approval process shall be as specified
elsewhere in the Contract Documents.
The following table details the clauses within this Special Provision, which are to be validated through the
PIT, POP, and SIT processes as indicated:
CLAUSE
5.1.1.4
PIT
POP

5.1.1.7

5.1.1.9

5.1.1.14

5.1.1.15

February 2009
SIT

Pg. 6 of 7
SSP682S31
CLAUSE
PIT
POP
5.1.1.16

5.2.1

5.2.2

5.2.3

5.2.4

7.3.1

7.3.2

7.3.3

7.3.4

7.3.5

7.3.6
1
SIT

7.3.7
Testing Footnotes:
1
GRID software report shall be submitted as part of test results documentation.
8.
QUALITY ASSURANCE - Not Used
9.
MEASUREMENT FOR PAYMENT
Measurement of the number of magnetic cards is by Plan Quantity as may be revised by Adjusted Plan
Quantity.
The unit of measurement is each.
10.
BASIS OF PAYMENT
Payment at the Contract price for the above tender item shall be full compensation for all labour, Equipment
and Materials required to do the work, except System Integration Testing which is paid for under a separate
item.
No payment shall be provided as compensation for any labour, equipment and materials required for
evaluation of alternative, non DSM listed product sources under this contract item.
WARRANT:
February 2009
Always with this item.
Pg. 7 of 7
SSP682S31