GTO/Linear Pro Automatic Exit Sensor - 50' (FM139) / Mighty Mule (FM138)


  • GTO Linear Automatic Exit Sensor

Price: $139.84
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   Product Details

  • Compatibilities
  • Accessory Uses
  • Words from Senior Application Engineer
  • Accessory Features
  • Options
  • Product Media
  • Loop Placement Formula

  •    Accessory Compatibilities Top of Page

    The Might Mule/GTO Automatic Exit Sensor is compatible with: All gate openers.

    GateCrafters.com offers more expert assistance than anyone. We have live application specialists available 9am - 9 pm EST 7 days a week.

       Accessory Uses Top of Page

    Automatically activates gate operators "hands-free" when a vehicle approaches. Designed for residential, agricultural, and commercial applications. Easy to install. Avoid the headaches associated with installing exit and entry loop detector systems, installs in 1/3 the time.

    The exit wand is an electromagnetic sensor that detects metal mass in motion providing a 12 foot radius of detection that allows hands free exit from automatic gate operators.

    The MightyMule/GTO Exit Wand has very low power consumption with a wide input voltage range that makes it ideal for battery applications. It is designed to reject line noise of 50 Hz or 60 Hz to improve its detection compatibilities near power lines.

    Note: Exit wands / sensors should not be used on properties in which the driveway gate is designed to keep in pets, children or live stock due to possibility for unintentional openings. Our suggestion is to use a keypad for exiting so the gate will only open when it is intended to by code.

    GateCrafters.com is the DIY factor. GateCrafters.com further adds to most of our gate openers for easier DIY installation. We have developed exclusive components (example: easy adjustable mounting brackets), customized instructions, and offer a full spectrum of accessories to truly cover all aspects of the installation of your gate opener. In addition we have the largest staff of factory trained technicians in the US.

       Accessory Features Top of Page

  • Direct Burial: buries directly without conduit.
  • Large Range: Range of 15 feet from wand. NOTE: GTO / Mighty Mule wands no longer come with range adjustment boards.
  • Multiple Lengths: 50, 100, 150 to put the wand farther from gate.
  • GateCrafters.com has the resources you need. How do you use your gate opener system once you get it? GateCrafters.com is the only retailer to give a real answer to this question. We have develop videos for installing many of our gate openers and products and write DIY focused manuals for most gate openers and have individual instructions for each accessory to be installed with each gate opener.

       Accessory Options Top of Page

  • FM139 - 50' Lead Wire
  • FM140 - 100' Lead Wire
  • FM141 - 150' Lead Wire
  • GateCrafters.com has actual experience. We have a testing area, we have factory and internal training courses, we build gates and have our own gates that are automated, we attended all industry trade shows in multiple countries and are a member of the AFA, and we pay visits to our chosen manufacturers' factories. All these factors are what have lead to us having so many exclusive additions. When you see and actually use as many products as we have you tend to have many ideas for minor changes that have major impacts. We acted on these ideas and have utilized them to help thousands of customers automate their gates.

       Loop Placement Formula Top of Page

    Use this formula to calculate how far from the gate the loops should be place so that by the time a car reaches the gate, the gate will be completely open:

    Exit Loop formula: x*(y*1.46)=z
    x = time for gate to open in seconds.
    y = Desired MPH to reach gate.
    z = how far from gate.

    FYI - 1.46 converts miles per hour to feet per second. We also recommend adding in 10 to 20 feet so the gate is fully open at comfortable distance from the gate.

    For placement of a safety loop before and after the gate use the formula below. A safety loop is designed to stop the motion of the gate before the car reaches the gate. The distance below should give an ample amount of time for the gate to stop before hitting a vehicle:

    Safety Formula: 4 feet before a closed gate and after an opened gate.


       Words from Senior Application Engineer, Anthony Gaeto Top of Page

    “We are always getting questions about how gate exit wands work and how they are different from exit loops.

    Exit wands are what is know as a magnetometer which senses changes in the Earth’s magnetic field. An easy way to explain how exit wands work is to picture a boat traveling through the water. As the boat is traveling it is creating waves. As your car travels through the magnetic field of the Earth it creates similar waves, like the boat. The exit wand’s magnetometer picks up on these waves as you travel by the wand. One downside of exit wands is that they do loose sight of your vehicle when it is stopped.

    Gate Crafters carries 5 different types of exit wands that work very similar to each other. The only difference between these wands are some of their features. The GTO/PRO wireless exit wand is wireless between the magnetometer and receiver. The Gate Crafters exit wand is manufactured by EMX and has been around for years. The GTO exit wand is recommend for use with other GTO openers and accessories. The Estate Swing exit wand does come with a range control board that allow you to adjust the sensitivity of the magnetometer. This feature allows you tune down the range of the exit wand, so that vehicles such as a lawn mower doesn't set open your gate, but this isn't a complete failsafe, as it will still operate the gate opener when something is nearby. The Estate Swing Deluxe Exit wand is the most different from the other exit wands. It is constructed out of copper and features a ground cable that attach to a grounding rod that helps protect this exit wand from lightning strikes. The other 4 exit wands do not have this feature and are susceptible to damage from lightning strikes. Also the Estate Swing Deluxe Exit Wand comes with a 5 year warranty, which is longer than any other exit wand we sell.

    Exit loops differ from exit wands in that they are buried in the driveway in a loop and are wire to the gate opener. The way exit loops work is that they detect the presence of metal (your car) above the loop. It does not matter if your car is moving or not, the loop will detect the car. Besides being used to exit your property, exit loops are used for safety. When exit loops are used a safety device, they will prevent your gate from closing on your car, when it detect a car nearby to your gate. The exit loop is wired to a exit loop detector, which is then wired into your gate opener’s control board.

    GateCrafters.com is a one stop shop for gate openers and gate accessories at a great price. Gate Crafters was started on the idea of providing gate opener and accessories along with great customer service to our valued customers. We have technical support available to you 7 days a week from 9 am to 9 pm, eastern time. Our experts are standing by to take your phone call, answer your email, or chat with you with our live chat on our website. We welcome any question you may have and can help you put together a complete package for you so your gate operates how you want it to. We look forward to hearing from you.

       Product Media Top of Page


    Manual: Automatic Exit Sensor Manual
    QB ID: FM139


       Reviews Top of Page
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