Marsh Products logo. Click to return to home page.

Vehicle Detection

Preformed Direct Burial PVC-Encased Loop and Vehicle Detector

Part No. 10865B

The Preformed Direct Burial PVC-Encased Loop comes with the Marsh Vehicle Detector and 100 feet of cable.

The five-turn, PVC-encased, Preformed Loop is designed for on-site installation prior to pouring pavement material. Also included is the Marsh 610 Loop Vehicle Detector and 100 feet of cable, giving you a complete loop detection system.

Loop Characteristics

  • Measures 18 inches by 54 inches.
  • Includes five turns of #16 insulated machine tool wire.
  • 48-inch extension to extend loop beyond curb.
  • 11-inch extension and 90-degree elbow to extend into menu board/speaker post.
  • Encased in Schedule 40 PVC material.
  • Sealed with 100% silicone sealant to prevent water infiltration.
  • 20-foot wire pigtail from loop.
  • Loop installation instructions.
  • 5-year warranty.

Vehicle Detector Characteristics

  • Power requirements: The 610 Loop Vehicle Detector can be powered by either a 9-20VDC or 9-16VAC. The 610 is shipped with a Underwriters Laboratories-approved Class 2 plug-in-the-wall 12 VDC power adapter. However, the power can be supplied by any external device and connected via the screw terminals provided inside the enclosure.
  • Enclosure: The housing is constructed of durable black ABS plastic. Legend art is printed on the cover to clearly identify the connection points and the LEDs. The case provides two mounting tabs for use with the provided hardware.
  • Modes of operation: The type of output signal can be programmed to any of four possibilities:
    • Constant signal on detection.
    • Pulse on vehicle arrival.
    • Pulse on vehicle departure.
    • Pulse on arrival and departure.
  • Environmental tuning: The 610 is operational within three seconds of applied power. As environmental conditions slowly affect the loop frequency, the 610 detector follows the change, recording the change every half-second. However, vehicle presence is never tuned out. Hold time is infinite on the detection of a vehicle. If a large metal mass were to affect the loop and create a detection, the next vehicle would correct the presence signal when it departs. In essence, the detector is self-correcting.
  • Signal delay on arrival: One of four delay periods can be programmed. The programmed time delay is the length of time from the detection of a vehicle to the actual output of the signal.
  • Solid state switch signal output: Open collector NPN transistor output. Protected from over-voltage by a shunt 1N5258B 36-volt zener diode. Presence signal is capable of sinking 50 milliamps.
  • Signal delay on departure: One of four delay periods can be programmed. The programmed time delay is the length of time between the departure of a vehicle to the absence of the output signal. For example, if a one-second delay is selected, then the output signal will drop one second after the vehicle is no longer detected.
  • Loop fault: When a loop fault occurs, the red LED is lit and signal outputs go to a presence state. Loop faults are triggered when the loop frequency falls below 20 kilohertz or rises above 75 kilohertz, indicating a loop open or short, respectively.
  • Relay signal output: The 610 Loop Vehicle Detector supplies a 2-amp form-c contact relay output in addition to the solid-state switch signal output.
  • Grounded loop operation: The loop isolation transformer allows operation with loops grounded at a single point.
  • Lightning protection: The loop input is protected by a series pair of 1N5235B 6.8-volt in-series shunt placed the loop input terminal.
  • Internal circuitry isolation: The loop is isolated through the loop isolation transformer.
  • Current draw: Maximum: 25 milliamps.
  • Loop inductance: 30-1,000 microhenries with Q factor of five or greater.
  • Operating temperature: Minus-40 F. to 180 F.
  • Programmable sensitivity: The sensitivity can be set to one of four possibilities.

The loop is ideally suited for vehicle detection in traffic control environments such as drive-thrus or parking lots. It is intended to be used before pavement installation; if pavement has already been poured, the Marsh Products Preformed Saw-Cut Loop Kit is more cost-effective and easier to install.

Need loop installation instructions? You can download them by clicking here. (They're in PDF format.)

Free ground shipping within the U.S.!

Price: $310    Buy Now

Note: When you click the "Buy Now" button, you'll be taken to the shopping cart run by our sister company, TimePilot Corporation.

Marsh Products warranty

For one year after you purchase a Marsh Products Loop and Vehicle Detector, we will repair or replace (at our discretion) any malfunctioning hardware. The purchaser pays only the shipping to return the malfunctioning part to us. The warranty is void if the product is returned in a damaged state for any reason, including damage that occurs because of a failure to follow installation instructions.