Protos 4.75T Wireless Load Cell Shackle (600m Range)

Each PROTOS wireless load monitoring system is real-time, cost effective and easy to use. PROTOS wireless load monitoring systems increase the safety by showing the actual load, on any given point, to the lifting operator. Either with a simple handheld or with free software available for PC and a USB base station. The software allows the setup of schematic stage lay-outs, maximum loads, overload warnings, and e.g. total loads. All done within minutes.

The PROTOS Load Cell Shackle is the starting point of each load monitoring system. Based on the well known Crosby Bow type shackle. Available with a WLL of 3,25T or 4,75T. Safety factor 5:1.

With an IP-rating of 67 and an operating temperature range from -20 to +50?, all PROTOS Wireless Load Cell Shackles can be used in almost all weather conditions and use the worldwide available free 2.4GHz band. With a reading distance up to 800 metres.

The entertainment industry is developing at a fast rate in order to keep up with the latest developments. As the hunger for state of the art shows keeps growing, concerts, plays and shows are constantly evolving as each itteration has to be more specatular than the last. As a result rigging has taken a prominent role in almost every show.

Rigging plots have become more complex due to performers, props, construction and the like being utilised as premium parts of the show. In this landscape, being able to measure the load that you’re lifting is essential for safe working conditions, to protect people and priceless equipment.

For this, we have developed a comprehensive range of force monitoring equipment for the entertainment industry. A complete line of wireless and wired daisy chain loadcell shackles ranging from 3.25 to 4.75 Tonnes is available for in and outdoor use thanks to the use of IP67 rated enclosures.

The shackles are equipped with a unique centralising bobbin for precise measuring of the load. The daisy chain loadcells can be run with up to a 1000 meters of wire and can be used in groups of up to 32 units. The wireless loadcell receivers have a range of up to 800 meters, this can be further extended by 800 meters when using the PROTOS active repeater. Using the repeater also makes it possible to circumvent signal blocking obstacles.

The force monitoring software can be installed on a computer or tablet with Windows OS installed. Personalised settings, configuration and layout of the soft- and hardware can be easily achieved with their quick start guide.

Also available is the wireless handheld receiver for quick reverence of individual loadcells. The handheld will wake the loadcells up when in range. Other devices PROTOS offers are an integratable wireless wind speed meter, power pack, a solar panel to charge it that can be of great value when having long term setup and many more products.

For users with more specific needs, we have a GPRS transmitter unit available, which is able to send an email or SMS to any phone in the world as soon as a user determined limit, such as for example high wind speeds or loading limits, has been reached. Sudden changes in weather conditions can be very problematic, but with this unit, surprises like an overload when there is no rigger present on site can be mitigated.

To improve safety, with a focus on the flexibility and ease of use that this industry needs. Making an intuitive and affordable solution to measuring the forces on the loads you’re lifting, or the structures you’re building!


Weight Range (SWL)3,250kg4,750kg
Typically ±1% of load or ±25 kg whichever is greater
Estimated Battery Life 2xAA Duracell
Asleep5+ years5+ years
Continuous operation3 months3 months
8 hours usage per day8 months8 months
2 hours usage per day30 months30 months
IP rating
Operating temperature range
-20 to 50 ℃
Storage temperature excluding batteries
-40 to 50 ℃
0 to 95 %RH
Title Type Size
PROTOS Force Measure System application/pdf 1 MB