Introduction
The Mighty Mule 50 ft. Driveway Vehicle Sensor (model FM138) is designed to automatically open your gate when a vehicle drives past its magnetic field. This allows for hands-free exit from your property without the need for a remote control or keypad. It is compatible with Mighty Mule and GTO Access Systems gate openers and is suitable for both residential and agricultural applications.
This wired sensor detects metal mass in motion and features a 12 ft. magnetic sensing range. The unit comes with a 50-foot cable for installation.
Image: Mighty Mule FM138 50 Ft. Driveway Vehicle Sensor in its retail packaging.
Setup and Installation
Proper installation of the FM138 vehicle sensor is crucial for optimal performance. The sensor is designed for direct burial and should be placed parallel to your driveway.
- Placement: Position the sensor between 3 to 50 feet away from the gate. For optimal gate opening time, consider the length of your driveway and typical vehicle speed. A longer distance allows the gate more time to open before the vehicle reaches it.
- Trenching: Dig a trench along the driveway where the sensor will be placed. The sensor should be buried no more than 12 inches deep. It is recommended to use conduit for the cable to protect it from environmental factors and potential damage.
- Sensor Orientation: Ensure the sensor is laid flat and parallel to the driveway within the trench.
- Wiring: Connect the sensor's cable directly to the appropriate terminals in your Mighty Mule Automatic Gate Opener control box. Refer to your specific gate opener's manual for detailed wiring diagrams. Ensure all connections are secure and waterproof.
- Testing: After installation, test the sensor by driving a vehicle past its magnetic field to confirm the gate opens automatically.
Image: Illustration of the Mighty Mule FM138 Driveway Vehicle Sensor installed, depicting its magnetic field detecting a vehicle.
Image: Diagram illustrating the magnetic field detection area of a vehicle sensor for gate openers.
Operating Instructions
The FM138 vehicle sensor operates by detecting changes in its magnetic field caused by the presence of a large metal object, such as a vehicle. When a vehicle enters the 12-foot magnetic field, the sensor sends a signal to the gate opener control box, initiating the gate opening sequence.
- The sensor is designed for exit-only functionality, allowing vehicles to leave the property automatically.
- It works with both single and dual gate systems.
- No remote control or keypad input is required for exiting once the sensor detects a vehicle.
Maintenance
The Mighty Mule FM138 sensor is designed for durability and minimal maintenance. However, periodic checks can ensure its longevity and reliable operation:
- Cable Inspection: Periodically inspect the exposed portions of the cable for any signs of wear, damage, or rodent activity. Repair or replace damaged sections promptly.
- Debris Clearance: Ensure the area directly above and around the buried sensor is clear of excessive debris, heavy foliage, or large metal objects that could interfere with its magnetic field detection.
- Connection Check: Annually, check the wiring connections at the control box to ensure they remain tight and free from corrosion.
Troubleshooting
If your Mighty Mule FM138 sensor is not functioning as expected, consider the following:
- Gate Not Opening:
- Verify all wiring connections to the control box are correct and secure.
- Ensure the sensor is buried at the correct depth (no more than 12 inches) and is not obstructed by large non-metallic objects.
- Confirm the gate opener itself is powered and functioning correctly.
- False Triggers (Gate Opens Without Vehicle):
- Check for any large metal objects (e.g., metal lawn ornaments, buried pipes) near the sensor's detection zone.
- Ensure the sensor is not too close to the gate opener's motor or other electrical components that might cause interference.
- Some gate opener models may have sensitivity adjustments in the control box; consult your gate opener manual.
- Intermittent Operation:
- Inspect the cable for any damage or breaks, especially if it was not installed in conduit.
- Check for loose connections at the sensor or control box.
For persistent issues, contact Mighty Mule customer support or a qualified gate technician.
Specifications
| Model Number: | FM138 |
| Cable Length: | 50 Ft. |
| Sensing Distance: | 12 Feet (magnetic field) |
| Mounting Type: | Surface Mount (for sensor unit, buried) |
| Material: | Plastic |
| Item Weight: | 3.9 Pounds |
| Product Dimensions: | 20.6 x 4.9 x 3.5 inches |
| Included Components: | 1 Vehicle Exit Sensor |
Warranty Information
The Mighty Mule FM138 Driveway Vehicle Sensor comes with a 12-month warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. For warranty claims or detailed terms and conditions, please refer to the documentation included with your product or contact Mighty Mule customer support.
Support
For technical assistance, installation questions, or troubleshooting support, please visit the official Mighty Mule website or contact their customer service department. Have your product model number (FM138) and purchase information ready when contacting support.
Online Resources: www.mightymule.com
