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Anti-Collision System

Important information about GII systems 2023 – 06 »

Important action required on GII systems 2022 – 10 »

GIGASENSE® is a fail-safe anti-collision system / collision avoidance system for track bound cranes (EOT) or similar equipment in tough industrial environment. The GIGASENSE anti-collision system is easy to install, robust, maintenance free and comes with built in self diagnostic functions to monitor the system. The microwave technology makes it especially suitable for steel-works, harbors and the like environments.

Gigasense Anti-Collision function

To protect two cranes: one crane uses an A-unit and one crane uses a B-unit. A- and B-units each consists of an active antenna and a relay box. The antenna sends a Microwave signal to the opposite unit. By using SFCW (Stepped Frequency Continuous Wave) radar, the distance and relative speed are calculated. To protect a crane from a wall or a track end: one transponder without the relay box can be used together with a complete A- or B- unit on the crane. The output relays switches at preset alarm limits to reduce speed and stop the crane movement. Settings and readout of parameters are easily accessible via a display and push buttons in the relay box.

The relay box contains three relays:

Relay 1 = Warning (speed reduction) or flashing light.
Relay 2 = Stops crane movement.
Relay 3 = Failure/unidentified object alarm.

One analogue output, 4-20mA is available for e.g. remote display.

Gigasense Anti-Collision safety

Avoids crane accidents and protects property and production. Designed to work in the toughest conditions such as in Steel works, Harbours, Mines etc. Fail Safe operation due to supervision of function, both in antenna box and relay box. The signal is very hard to disturb, the A- and B units use different frequencies, different polarization of the Microwaves and a ”fingerprint” radar reflection. The function has a backup capacitor in case of power failure. The anti collision system is not disturbed by rain, dust/metal particles, fog or sunlight.

See how the Anti-Collision works


  • Cuts crane repairs, downtime and costs.
  • Easy and straight forward to install.
  • Maintenance free.


  • Working distance
    2 – 40m, the maximum working range varies for different frequencies from 25m to 50m due to restricted output power
  • Speed range
    0.05 – 3 or 5 m/s relative speed between two moving cranes, depending on frequency
  • Relative Speed Compensation
    The alarm limits can be compensated (20-1500%) for different speeds
  • Relay outputs
    Three potential free relays (250 VAC / 8A)..
  • Temperature range
    -25°C to +70°C.
  • Supply voltage
    24 VDC (alternative Voltages available as option). Transponder unit 12 VDC.
  • Transmitter Frequency
    9.4 – 10.6 GHz (country specific).
  • Gross weight & dimension
    System incl. packaging (Unit A + Unit B): 13.5 kg / 510x510x290 mm



Important action required on GII systems 2022 – 10

All concerned customers have received an e-mail with detailed information on upgrades required after we discovered issues on the GII microwave based Gigasense Anti Collision System.

As most of our sales is made via distributors, we find it important to have this information on our home page, especially for our end users.

Tests have shown that different frequencies in combination with software versions provide a maximum relative speed that the system can reach to operate safely between the track bound equipment, most commonly EOT Electrical Overhead Travelling cranes. Follow the table below to see what the maximum allowed relative speed is for your system. The speed must not be exceeded.

Do the following:

1) Check your GII frequency on your order confirmation or on the side of the antenna box and find your frequency in the table below.

2) Check software version in the display of the relay box, the software can be seen in the display when the relay box is restarted or when the menu has not been touched for a long time. More information can be found in chapter “Menu Structure“ in the user manual. Find the software version in the table below.

3) With the current frequency and the installed software, you can see the maximum permissible relative speed for your GII system in the table below. If the relative speed of the cranes is higher than the table allows, the software must be updated. You receive the upgrade kit free of charge if you have not received it already.

4) For all GII-systems, regardless of frequency and software version you must set speed compensation Spd1 & Spd2 to minimum 10% in the relay box. Follow the instruction in chapter “Menu Structure” in the user manual to change the setting on speed compensation.

Frequency / configuration Program version Max relative speed*
9.47 GHz A23, A24, A25, A28, A34 3m/s
9.47 GHz B03 & B04 1m/s
9.9GHz (France) A23, A24, A34, B12, B13 3m/s
9.9GHz (France) B04 1m/s
9.9GHz (Russia) B11, B12 3m/s
9.91GHz B11, B12, B13 3m/s
10.475GHz (Finland) A28, A34 3m/s
10.475GHz (Finland) B04 1m/s
10.54GHz A22, A23, A24, A25, A28, A34 5m/s
10.54GHz A21 4m/s
10.54GHz B03 & B04 1m/s
* Relative speed is the speed that two moving cranes have in relation to each other.

If the maximum permitted relative speed is exceeded and/or that the speed compensation Spd1 & Spd2 is not set to minimum 10%, there is a risk that the cranes will not stop at the set alarm limits, Limit1 & Limit2.

Contact support@gigasense.se or via phone +46 8 540 839 00 (ask for support) if you have questions.

We are open Monday – Thursday 8 am until 4:30 pm CET, Fridays 8 am until 3 pm. Closed for lunch Mo-Fri noon – 1 pm.

Important action required on GII systems (PDF)



Important information regarding all GII Anti Collision Systems used within the EU market – your immediate action is required 2023

All concerned customers will also receive an e-mail with this information and required actions.

You will receive a supply of warning labels to be attached to the relay boxes on the GII and in the user manual.

Action required:

  1. Attach a warning label on the relay box, instructions will be supplied with the labels.
  2. Attach a warning label in the user manual, instructions will be supplied with the labels

The labels contain the following information:

“Important! GII is not intended to protect humans. The user of GII is responsible for taking the necessary safety measures in environments where current conditions imply a risk to human safety or health. Use of GII to protect human safety or health may result in serious personal injury or death.”

Why this should be done:

GII is not certified to be a functional safety system in accordance with the Machinery Directive.

As a Gigasense distributor, you are obligated to ensure that all end users receive the information contained in this letter immediately.

Confirm via E-mail to engineering@gigasense.se that you have received this information.

Confirm via E-mail to engineering@gigasense.se when you have notified all your end customers.

CEO Marie Samuelsson are available any time if you have questions.

Contact information:

CEO: Marie Samuelsson, Ph. +46 8 540 839 04, Mobile +46 72 744 3904, E-mail marie.samuelsson@gigasense.se

Important information about GII systems (PDF)