The new system uses a magnetic lock fail-safe* controlled remotely to release barrier arm from its locked position to allow it to travel up or down automatically to its released positon.
Also this unit can be ordered with an electrical mechanical lock fail secure** to release barrier arm from its locked position to allow it to travel up or down automatically to its released positon. Once the barrier gate is remotely actuated it is returned to the locked position by hand. The MB832SA can be additionally locked in the released position for added security.
*Fail-safe arm unlocks during power failure  

** Fail-secure arm stays locked during power failure.
Click here for MB832 & MB32SA pictures, specs & details.

Why buy a Semi-automatic barrier gate versus an electric barrier gate?
This new type of barrier gate can be installed in a couple of hours anywhere and can be powered by a small solar panel with many remote control options saving substantial installation costs.
Typical Uses:
Emergency opening of roads, parking lots, industrial plants or any other facility that needs emergency
one-way operation to egress traffic.
Emergency closure of public roads during flooding, industrial plant fires, traffic control for guard shack use to stop vehicles.

How it works from arm up locked position to released down position: Note: Semi-automatic parts shown in black for illustrations, shipped color same as barrier.
Barrier in the magnetic locked up position. The mag-lock holds barrier arm in the up position with 1200 lbs holding force. When power to the mag-lock is cut the barrier arm will go down	Magnetic lock releases - barrier arm lowers. After power is cut to the mag-lock a torsion spring starts the arm moving to the down position. Counterweights can be field adjusted to control speed.	Barrier arm in the closed Down position. In the down position an additional mag-lock can be added to hold the arm down for added security.
How it works from arm down locked position to released up position: Note: Semi-automatic parts shown in black for illustrations, shipped color same as barrier.
Barrier in the magnetic locked down position. The mag-lock holds barrier arm in the down position with 1200 lbs holding force. When power to the mag-lock is cut the barrier arm will go up.	Magnetic lock releases - barrier arm goes up. After power is cut to the mag-lock counterweights start the arm moving to the up position. Counterweights can be field adjusted to control speed.	Barrier arm in the open up position. In the up position an additional mag-lock can be added to hold the arm up for added security.

MB832 Standard Specifications: Round Aluminum powder coated arm 3" O.D. ; 8 to 32 ft length pre-cut and balanced at the factory High quality DOT reflective tape included Frame is heavy steel construction- 5/8" Base Plates and thick tubular construction using structural hot-rolled steel. Plastic signage available (stop, do not enter, etc) Three sizes of steel counterbalance plates for balancing arms up to 32ft in length Arm can be locked by padlock in the up or down positions for added security and safety.  All parts are powder coated orange for durability. Pivot assembly is made of durable maintenance free plastic bushings and bolt assembly Tip support cradle (MBcradle) is suggested for arm lengths over 16 ft Orange powder coating standard on all other components Self-supporting round Aluminum barrier arms Stainless Steel and Galvanized Hardware for long life. MB Drop-down tip support for areas where the MBcradle cannot be used. Barrier arm catcher (MBcradle)  is optional for shorter arms for added support Variable arm length: Three different sizes counterweights allow field adjustments up to 32 ft arm lengths, additional arm tube and splice may be required Arm length- is measured from the front edge of the 4 hole baseplate   Small counterweight to 16ft Arms up to 4 plates used Large Counterweight for 17ft to 32 ft Arms up to 6 plates used    Dimensions: Base plate: 16" X 10.5"; height of arm above pavement 35"; overall height 37"; width of frame 10" X 10"; baseplate- 4 holes 5/8" dia.; length of counterweight arm from pivot 32.5" Maximum. Arm length- is measured from the front edge of the 4 hole baseplate as it faces the street. Shipping Wt.  182 to 502lbs depending on arm length.

Click on pictures for more detail