Fast, portable and accurate, BISON C-Jacks are robust industrial scales for weighing grounded shipping containers.
Trusted by exporters, forwarders, logistics firms, military and port authorities in over 25 countries, C-Jacks are the perfect solution for managing compliance, optimising payloads and weighing containerised commodities from any location.
C-Jacks eliminate reliance on weighbridges and third parties for weighing containers. By taking the scales to the container, you can get instant container weight verification at a time and place that best suits your shipping operation.
Capable of weighing all shipping container types and sizes up to 35,000kg, BISON C-Jacks are OIML certified and highly accurate. BISON C-Jacks put you in control of your container weights.
"From a cost point of view we don't need to pay for every weigh, so we anticipate that the payoff will be less than a year and a half, and we would have probably halved the time it takes for us to weigh our containers in any given week."
We have a range of accessories available to suit all of your container weighing needs.
Use spacers to attach C-Jacks to the ends of the container.
C-Leg stands are available as a separate component.
Turn your C-Jacks into a heavy duty beam or platform scale with connectors.
The ground surface should be firm, compacted and level for weighing. With due care and attention, it is possible to weigh containers accurately on rough (i.e. gravel) and uneven (i.e. pot holed) surfaces. Steel ground plates are supplied with C-Jacks to spread the load at each corner and minimize marks on the ground. The height and tilt adjustment features on C-Jacks and C-Legs assists with accurate weighing on uneven surfaces and helps avoid overloading single corners when weighing heavy containers.
The weighing surface should be level. Weighing containers on a slope poses a safety hazard, as the elevated container may have a tendency to slide downhill. It is also important for accurate weighing to keep the scales vertical, as indicated by the “ANGLE” warning on the display.
No. BISON provides user manuals and instructional videos advising how to weigh containers safely and accurately. No special qualifications are needed. The scales are designed to be intuitive and easy to use. Once you have weighed around 6 containers, you'll be an expert.
Yes, you can weigh containers from the ends. As the door end of the container is recessed, BISON can supply a pair of customised plastic blocks - called "spacers" - to fill the gap between the door and the weighing module. The spacers are customised to fit the majority of containers and use magnets to attach to the container. We recommend that care is taken with heavier containers (> 20 tonne) to ensure the loading doesn't damage the container door seals and hinges. The rear of the container is the same as the sides, so spacers are not needed at the rear end.
For grounded 20' containers, it takes one person 4 - 5 minutes to attach, weigh and pack the C-Jacks away. The operation can take a little longer for 40' containers and takes less time if more than one person is involved. Here is a time compressed video of the full operation.
The container only needs to be lifted just clear of the ground or chassis. Typically the lift height is 2 to 3 cm.
Only one person is needed to weigh containers with C-Jacks and C-Legs, but two or more people can work in parallel for a faster operation.
BISON Scales can be used to weigh any length container up to 35,000 kg (77,000 lb). The scales are compatible with all ISO containers, including tank containers and reefers.
BISON Scales have a weighing capacity of 35,000 kg (77,000 lb). Each scale has a weighing capacity of 10,000 kg (22,000 lb).
The Maximum Permissible Error acceptable for BISON Scales to be 'legal for trade' is ± 75 kg at 35,000 kg, which equates to a accuracy tolerance of around 0.2%. The actual error is typically half of this when the equipment is well calibrated with accurate test weights. For general container weighing applications where 'legal for trade' approval is not required, the scales can be more easily calibrated on BISON's Calibration Rig, and this results in an accuracy tolerance of better than 1%.
All BISON Scales are factory calibrated prior to shipping. Once used, the scales can be re-calibrated with BISON's Calibration Rig and Configuration App. The accuracy tolerance from this method of calibration is better than 1%. A higher accuracy tolerance of better than 0.2% can be achieved by fine-tuning the scales with certified test weights. You can buy your own Calibration Rig and Configuration App, or contact BISON or your dealer to talk about re-calibration service options.
How often you need to re-calibrate BISON Scales will depend on what you are using them for, how frequently they are used and the weight of the containers you are weighing. For reliably accurate weighing, re-calibration once per year is recommended.
Yes. BISON Scales have an IP 64 ingress protection rating. This means the system has complete protection against ingress of dust and there will be no harmful effects from dripping, spraying and splashing water. We recommend inverting the hydraulic bottle jacks after use in wet conditions, to extend their working life by avoiding internal corrosion. A water displacement spray like CRC applied to the piston-rod will also help the longevity of the bottle jacks.
The batteries have a 45 hour tested life cycle. This life cycle reduces to approx. 20 hours if the scales are used in low light environments and the LCD backlight turns on.
BISON Scales have a design life of 10 years. Their actual life will depend on how they are cared for and serviced. However the internal components are very modular, making it easy to replace the load cell, electronics etc and keep your scales operational.
BISON Scales require very little maintenance. The batteries will need to be changed periodically. We supply high quality Japanese-made bottle jacks which have proven to be very robust but can be easily replaced if issues arise. You may also need to re-calibrate and/or re-certify the scales periodically, depending on your application.
Product warranty may vary from country to country. In general, all hardware comes with a one year, limited warranty against defects in materials and manufacturing.
Yes, BISON can specify and supply spare parts with your order. If spare parts are needed later, these can be shipped immediately on request. BISON Scales are very modular, making it easy to diagnose and resolve issues quickly with replacement parts.
If you purchased the scales from a dealer, contact your dealer in the first instance. If you purchased the scales from BISON, email s......@bison-jacks.com. BISON will help you resolve any problems quickly and cost effectively. After sales service is supported by a remote diagnostics feature in the BISON VGM App. This allows BISON to test performance and diagnose any issues with your scales remotely via the internet.