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Tools and Fixings Required
• Minimum 2 x M8 screws for securing the ALPHA.
• Minimum 1 M8 Screw for securing the ALPHA-S Knob.
• Screws must be suitable length for a minimum of 10mm thread engagement.
• Screws must be security type to prevent unauthorised removal or tampering.
• Required torque setting; 40 Nm.
• 2 x M8 Nut / T-Nut / Threaded Hole for securing the ALPHA.
• 1 x M8 Nut / T-Nut / Threaded Hole for securing ALPHA-S Knob.
• Driver suitable for securing M8 screws.
• Adhesive Threadlocker to secure mounting fixings from loosening due to vibration.
Mounting
1. Locate the ALPHA so that it can correctly Block the Door or Gate with both the front mounted Paddle and rear mounted
Blocker plates. See Fig. 1 and Fig.2 for details.
2. Secure the ALPHA using minimum 2 x M8 screws through the available mounting holes at the top and bottom of the rear
mounted mounting plate. Secure the ALPHA-S Knob using 1 x M8 screws through the centre of the knob.
3. Perform Mechanical Function tests before completing installation and commission. See Mechanical Function test section
for more details.
Mount the complete device only in the correctly assembled condition.
• All mounting surfaces should be flat, stable and suitable of providing a minimum of 10mm M8 thread engagement or
sufficient support to either an M8 Nut or M8 T-Nut.
• The ALPHA device must be located so that scheduled inspection and maintenance procedures are all easily possible.
• The complete machine guarding installation must conform to all relevant design, construction and installation standards
and guidelines.
• Any gap around the perimeter of the machine and guarding when closed and locked (Safety Outputs High) must not
exceed the limits specified in ISO 13857 & ISO 14120.
• All fixing screws used to mount the complete Device must be permanently prevented from removal. If mounting fixings are
visible, they must be secured against removal by personnel using standard tools, manipulation and un-authorised or un-
identifiable removal. If mounting fixings are not visible or hidden, they must be secured against removal or loosening due
to vibration. In both cases, a middle strength adhesive threadlocker is required.
• The complete Device must not be used as a mechanical stop. Where applicable, precautions must be made to ensure the
door or gate of any guarded area has sufficient support and stops to prevent the impact on the Device.
Note: that it is not possible for a left-hand facing ALPHA-2H device to be reconfigured or re-assembled as a right-hand
facing ALPHA-4H device. If alternative handing and orientation is required, please contact Unique Safety Products
Note: For ALPHA-S the device is the same for left and right hand just rotate the device 180 degrees
Mechanical Function Test Instructions
Test 1
1. Remove the locking mechanism of existing Door lock or Interlock product if fitted.
2. Open the Door or Gate.
It must not be possible to fully open the Door or Gate until the Personnel Key has been rotated and removed.
Test 2
1. Fully open the Door or Gate open and remove the Personnel Key.
2. Close the Door or Gate.
It must not be possible to fully close the Door or gate until the Personnel Key has been re-inserted and rotated.
It must not be possible for the existing Door lock or Interlock (if fitted) to re-engage until the Personnel Key has been
re-inserted and rotated.
It must not be possible for a machine restart signal to be generated (such as via an additional Door lock or Interlock)
until the Personnel Key has been reinserted and rotated.
Operating Instructions: Interlock Blocking - ALPHA
Unique Safety Products | www.uniquesafetyproducts.com | sales@usp-safety.com
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