Boom Angle Indicators: Manual & Electronic

Rieker Boom Angle and Tilt / Level Indicators Comply with Current OSHA Standard 1926.550

All cranes, derricks and certain lift equipment require some form of boom angle indication. Boom angle indicators are normally mounted on the boom butt, visually readable by the operator. A manual type inclinometer usually has degree numbers from -20 to +90 degrees. The numbers should remain clean and visually readable at all time. The capacities that are listed on the crane load charts are also based on and vary with the boom angle of the crane. <continued>

Manual Boom Angle Indicators <Please click on the above pictures for complete line>	Electronic Digital Display Boom Angle Indicators <Please click on the above pictures for complete line>
Manual Type	Electronic Type
Rieker's manual boom angle indicators and boom angle inclinometers are not affected by outdoor elements. These instruments are made tough and will not rust, freeze, or otherwise "hang up" like old fashioned pendulum style boom angle indicators. Like all of our instruments, each boom angle indicator is properly dampened for smooth reliable readings. Designed for easy mounting with two screws allows for quick and efficient retro-fitting in the field. Available in a highly visible backlit model for increased safety - complies with National Fire Protection Association 1901 Standards for Automotive Fire Apparatus	Like the manual line, our electronic boom angle indicators are sealed in a rugged case that protects the sensor components from harsh environments. The RDR Digital Boom Angle Indicator can be set to give audible and visual warnings, display degrees, percent grade or inch per foot rise with 0.01° resolution, and act as an equipment shut-off controller. Click on the picture of the digital display unit above to view the specifications available for this extremely flexible electronic boom angle indicator.
If you have an application that requires custom specifications, please contact us today with your requirements. One of our engineers will be happy to speak with you.

OSHA - Occupational Safety & Health Administration / U.S. Department of Labor
• Part Title: Safety and Health Regulations for Construction
• Subpart Title: 1926 Subpart N: Cranes, Derricks, Hoists, Elevators, and Conveyors

...1926.550(g)(3): Cranes and Derricks

......1926.550(g)(3)(i): Operational criteria: The crane shall be uniformly level within one percent of level grade and located on firm footing. Cranes equipped with outriggers shall have them all fully deployed following manufacturer's specifications, insofar as applicable, when hoisting employees.

...1926.550(g)(3)(ii): Instruments and Components

......1926.550(g)(3)(ii)(A): Cranes and derricks with variable angle booms shall be equipped with a boom angle indicator, readily visible to the operator.

<Click the link below to visit the OSHA web site> http://www.osha.gov/OshStd_data/1926_0550.html

For example: On hydraulic cranes, the boom angle is the angle between the bottom of the boom butt and the

horizontal while the boom is under load (fig 1, view A). The boom angle on lattice boom cranes is the angle between

center line of the boom (from the boom butt pins to the boom tip sheave) and the horizontal while the boom is

under load (fig 1, view B)

Figure 1

To check the accuracy of the boom angle indicator, place a 3-foot builders level on the center boom section and

raise or lower the boom until the level indicates the boom is level. At this point the boom angle indicator should

show the boom is at zero degrees or adjusted to read zero degrees.

Please note: The boom angle indicator is a quick reference for the operator to know what angle the boom is at.

However, do NOT rely on the boom angle indicator for radius accuracy especially when the lift exceeds 75 percent

of the rated capacity. Use the radius measurement to determine the capacity of the crane from the load charts

and to avoid any possibility of error.