Sentry 300 070310 / 070305 Exit Sensor Overview
The Sentry 300 070310 / 070305 exit sensor is used to automatically trigger a compatible gate opener when a vehicle exits the property. It is installed below ground beside the driveway and detects the movement of a metal vehicle through a magnetic field change. This allows residents, staff, or visitors leaving the property to open the gate without using a remote or keypad.
This product is an exit command accessory, not a safety sensor. It should not be used as entrapment protection, and it should not replace photo eyes, safety edges, or other required safety devices. Cable length, burial location, conduit protection, and control-board input wiring matter. The Sentry manual commonly references 070310 with a 100 ft cable, while 070305 is commonly associated with the CP-4 free-exit device family.
Compatible With
Use this exit sensor with compatible Sentry/USAutomatic gate operators that support a normally-open exit/open input and the specified sensor wiring.
- Sentry 300 swing gate opener systems with compatible exit/open input
- Sentry 300S and Sentry 300D free-exit vehicle detection applications
- USAutomatic 12 VDC gate operator systems where the CP-4 style free exit sensor is specified
- Solar-friendly gate systems where low accessory power draw is important
- Residential driveways, ranch entrances, estate gates, and select light commercial gate exits
- Related part number references 070310 and 070305 should be verified by cable length, packaging, and application
Features and Specifications
| Manufacturer | USAutomatic / Sentry |
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| Product Type | Free exit vehicle sensor |
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| Part Number | 070310 / related 070305 reference |
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| Detection Method | Magnetic vehicle detection |
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| Cable Length | 100 ft commonly referenced for 070310; verify package and part number |
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| Application | Automatic free-exit open command for compatible gate operators |
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| Power/System | Solar-friendly accessory for compatible low-voltage gate systems |
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| Safety Function | Not an entrapment protection device |
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| Installation | Below-ground beside driveway; conduit recommended |
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Also Known As / Related Part Numbers
- 070310
- 70310
- 070305
- 70305
- US-070310
- US-070305
- Sentry 070310
- Sentry 300 070310
- USAutomatic 070310
- USAutomatic 070305
- CP-4 free exit device
- Sentry exit sensor
- magnetic driveway exit sensor
- free exit vehicle sensor
Technician Note
Do not add extra cable to a sensor supplied with a fixed cable length unless the manufacturer instructions specifically allow it. Added splices and extra cable can cause nuisance operation, weak detection, or complete failure.
Before Ordering Checklist
- Confirm whether the existing product is marked 070310, 070305, or CP-4.
- Verify cable length before ordering, especially if the driveway distance is greater than 100 ft.
- Install in the correct location for exiting vehicles, not where cross traffic or parked vehicles will trigger it.
- Use conduit and protect the cable from irrigation, shovels, and driveway work.
- Remember this is an exit device, not a safety device.
Professional Advisory
Vehicle sensor installation often requires trenching, conduit, and careful placement. Have a qualified gate technician verify wiring and safety-device operation after installation.
Product Questions
Is the 070310 exit sensor a safety device?
No. It is a free-exit vehicle detection accessory. It should not be used in place of photo eyes, safety edges, or other entrapment protection.
What is the difference between 070310 and 070305?
070310 is commonly referenced in Sentry documentation for the exit sensor, while 070305 is commonly associated with the CP-4 free exit device family. Verify the actual part, cable length, and application.
Can I extend the sensor cable?
Sentry documentation warns not to add cable to the supplied sensor cable because it can create operating problems. Order the correct cable length when available.
Where is the exit sensor installed?
It is typically buried beside the driveway inside the property so a moving metal vehicle leaving the property triggers the open command.
Why does the gate open by itself?
Possible causes include poor sensor placement, nearby moving metal, cable damage, moisture, electrical noise, incorrect sensitivity, or a failing sensor.
