Boom Angle Indicators: Mechanical & Electronic

All cranes, derricks and certain lift equipment require some form of boom angle indication. Boom angle indicators must be visually readable by the operator. <continued>

4120 Mechanical Boom Angle Indicators Mechanical Type	RDI Digital Display Boom Angle Indicator 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.	Like the mechanical line, our electronic boom angle indicators are sealed in a rugged case that protects the sensor components from harsh environments. The RDSR3-BA-09 Digital Boom Angle Indicator provides audible and visual warnings, angle in degrees via LCD display, and has adjustable trip angle LEDs. Click on the picture of the digital display unit above to view the specifications available for the easy to use, OSHA compliant, RDI Digital Boom Angle Indicator
Available in a highly visible backlit model for increased safety - complies with National Fire Protection Association 1901 Standards for Automotive Fire Apparatus	Rieker Boom Angle and Tilt / Level Indicators Comply with Current OSHA Standard 1926.550
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

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.

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.