Authorised Sales, Service & Support agents for James Fisher Prolec
Authorised Sales, Service & Support agents for James Fisher Prolec

Office location:

Southern Office:

Dorchester, Dorset

t. +44 (0)1305 230318

m. +44 (0)7899 848569

f. +44 (0)7043 077211




Or use our contact form.

Sphere 24 Ltd - providing

Off Highway Plant Solutions

OnGrade 'PWS'

Proximity Warning System

Site Zone is a Radio Frequency Identification (RFID) based Proximity Warning System; using RFID based systems has several advantages over other technologies.

  • The system will only detect the transponders (also known as tags) that it is designed to detect which reduces false alarms and maintains system integrity.
  • RFID based systems are not restricted to line of sight and can "see around" blind corners or obstacles such as stockpiles
  • The same technology can be used for a range of different applications in the same environment e.g. access control


Multiple antenna configurations providing front and rear or full 360 protection

An audible and visual alarm for both machine operator and site personnel (option) if safe zones are breached

Personal transponder, individually identified and logged when safe zone is breached

Retrievable log to enable system manager to identify which individuals are breaching safe zones

Optional external alarm

Applications where PWS can be deployed include:

  • Material handling sites and transfer stations
  • Construction sites
  • Warehouses
  • Quarries
  • Depots
  • Ports

Proximity Warning System 'PWS' brochure

The Site Zone Proximity Warning System 'PWS' is designed to reduce the risk of vehicle personnel collisions and can be used anywhere the proximity of people and vehicles working together is of concern.

PWS Brochure for Forklift trucks
PWS Brochure for Forklift trucks
PWS-FLT-Site Zone V1.pdf
Adobe Acrobat document [2.6 MB]
Case Study
Case Study - Waste Industry
Case Study - Raymond Brown-5.pdf
Adobe Acrobat document [2.5 MB]
Case Study
Case Study - Earth Moving Project
Adobe Acrobat document [636.1 KB]

Video introduction on how it works…

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