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5 Things Crane Operators Can Measure Using a Load Moment Indicator



A hook suspended on a crane boom


LMI, AKA Load Moment Indicators, are designed to equip crane operators with the information they need to operate a crane within its parameters. It can perform various functions allowing crane operators to follow load chart limits and ensure equipment and material safety.

An LMI system offers various critical measurements such as total lifted weight, maximum boom angle, and load working radius. It comes with a factory-installed audio/visual alarm system that goes off if a crane operator exceeds the load chart limits specified by the manufacturer.

In this blog, we’ve discussed all the different warnings and measurements that crane operators can derive from a load moment indicator.

  1. Load Weight

An LMI’s primary function is to provide the load weight in real-time. It measures the total load lifted and informs the operator about the maximum load limit.

  1. Center of Gravity

An LMI system also measures and indicates a load’s center of gravity in real-time, helping crane operators improve load balance, stability, and adjustment.

  1. Load Moment and Dynamic Load Weight

Load moment is the torque created by a load between its position and the lifting equipment’s pivot point. It’s a continuously varying reading that allows operators to adjust during a lift.

In addition to load moment, an LMI system can also tell the dynamic load weight to reduce instability and overloading risks.

Crane operators should always follow the readings provided by their crane’s LMI system to improve the equipment’s performance, longevity, and safety. You can also leverage its automatic locking feature in case of an emergency.

  1. Load and Boom Angle

An LMI system can also measure the boom angle, which is the angle between a crane’s boom and the ground. Maximum boom angles vary according to the weight loads and, therefore, require constant monitoring during a lift.

  1. Operating Radius

LMI systems provide an accurate load working radius while a load is suspended on a crane hook. The crane load radius is the parallel distance between the center of the load to the center of the pin.



The RaycoWylie i4300 LMI system

Check out the RaycoWylie i4300 crane LMI system, which is an OEM device for carry deck cranes and is fully capable of monitoring load, capacity, angle, radius, and ATB. It comes with an alarm system with ATB warning calibration coupled with advanced CAN BUS technology and a three language-display. At Crane Warning Systems Atlanta, you can also check out the i4500 LMI-RCI system, which offers a 2-in-1 safety feature to prevent overloading accidents.

Read more about OSHA-compliant crane safety here: A Simplified Guide to OSHA’s Latest Crane Safety Code

Choose Crane Warning Systems Atlanta to Buy the Best-Quality LMI and RCI Systems in the USA

Crane Warning Systems Atlanta is a well-known, trusted, and reliable crane safety product distributor in the US. Our team has been providing advanced crane warning devices and RaycoWylie products since 2001.

We offer a wide array of crane warning indicators, such as crane anemometer, rated capacity indicators, and crane alarm. If you’re looking for authentic RaycoWylie crane warning devices in the US, Crane Warning Systems Atlanta has got your back!

You can also check our product manuals and free troubleshooting guides to learn about the specs and features of advanced crane indicator systems. Contact us for more details or request a quick quote now.



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