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Dispositif d'alarme pour travailleur isolé de Scutum Premium Services
published on 11/08/2026

Lone Worker Devices

Written by Nawres Chelbi

In the field of personal safety, and particularly when it comes to protecting isolated workers, the acronyms PTI and DATI are widely used. Although they are often used interchangeably, they actually refer to different but complementary concepts. Understanding the real difference between them is essential to ensure optimal protection and compliance with regulations.

Protecting lone workers involves more than simply providing an alarm device. For health and safety managers, HR professionals and business owners, understanding the difference between a lone worker protection system and the devices that form part of it is essential to managing risks and meeting employer responsibilities.

This guide explains how lone worker protection works, the legal requirements for UK employers and how alarm devices, monitoring and response procedures can work together to support employee safety.

Understanding PTI (Protection of Isolated Workers)

Understanding Lone Worker Protection

Lone working refers to situations where an employee works without close or direct supervision. This can include people working alone on business premises, travelling between locations or carrying out duties in remote environments.

Under UK health and safety legislation, employers must assess the risks associated with lone working and put appropriate measures in place to protect their employees.

These measures may include:

  • Assessing the specific risks associated with lone working activities.
  • Establishing safe working procedures and appropriate supervision.
  • Providing suitable communication and emergency alert arrangements.
  • Ensuring there are clear procedures for responding when a lone worker needs assistance.

Lone worker protection is therefore more than a device or alarm. It involves a coordinated approach to risk assessment, prevention, communication and emergency response.

UK Employer Responsibilities for Lone Worker Protection

Under the Health and Safety at Work etc. Act 1974 and the Management of Health and Safety at Work Regulations 1999, employers have a duty to assess workplace risks and take appropriate measures to protect their employees, including those working alone.

This involves identifying the hazards associated with lone working, implementing suitable control measures and establishing clear procedures for communication, monitoring and emergency response.

Employers should also ensure that lone workers receive appropriate information, instruction and training, and that the effectiveness of their safety arrangements is regularly reviewed.

Providing a lone worker alarm device is not, on its own, sufficient to demonstrate that risks are being managed effectively. The device must form part of a wider approach that reflects the nature of the work, the risks involved and the arrangements for responding when assistance is needed.

Who Needs Lone Worker Protection?

 

Lone worker protection is relevant to anyone who works without close or direct supervision. This includes maintenance engineers, security officers, healthcare and home-care workers, delivery drivers, field technicians, employees working alone at night and those travelling for work.

Lone working is not limited to construction sites, factories or remote locations. It can occur in offices, retail premises, healthcare settings and many other working environments.

Employers must assess the risks associated with lone working and introduce appropriate safety measures based on the nature of the work and the level of risk involved.

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Good to Know

Lone working isn't limited to industrial or high-risk environments. Employees working alone in shops, offices, car parks or other commercial premises may also be considered lone workers.

Even something as routine as being the last person in the office after colleagues have gone home can constitute lone working. Employers should ensure that appropriate safety arrangements are in place for these situations.

Understanding Lone Worker Alarm Devices

A lone worker alarm device is a piece of equipment or mobile application that enables an employee to raise an alert if they experience an accident, medical emergency, threat or other incident while working alone.

Unlike the wider approach to lone worker protection, which includes risk assessments, safety procedures and emergency response arrangements, an alarm device provides a practical means of requesting assistance.

Lone worker alarms can take several forms, including wearable devices, ID badges, smartphone applications and connected watches.

Depending on the device and its features, alerts may be activated in two ways:

  • Manual activation: The employee presses an SOS or emergency button to request assistance.
  • Automatic activation: The device detects a potential incident, such as a fall, prolonged inactivity or a change in body position.

Alerts can be sent to a designated colleague, an internal response team or a specialist monitoring centre, depending on the system and the arrangements in place.

An effective response procedure is essential. Raising an alert is only the first step; employers must also establish how that alert will be assessed and what action will be taken to assist the lone worker.

Key Features of Lone Worker Alarm Devices

Lone worker alarm devices offer a range of features designed to help employees raise an alert when assistance is needed. The most appropriate solution will depend on the working environment, identified risks and available connectivity.

Manual SOS Alarm

An emergency button allows the employee to raise an alert when they feel threatened, become unwell or require assistance.

Example: A security officer encounters an intruder during a night patrol and discreetly activates their alarm to notify the designated monitoring or response team.

Man-Down Detection

Some devices can detect a fall or a change in body position that may indicate an employee has collapsed. Depending on the configuration, this can trigger an automatic alert.

Example: A maintenance engineer falls while working alone and loses consciousness. A suitably configured man-down device detects the incident and raises an alert.

Prolonged Inactivity Detection

An alert can be triggered when the device detects no movement for a predefined period, potentially indicating that the employee is unable to request help.

Example: A worker becomes unwell while working alone in a cold storage facility. Their device detects prolonged inactivity and initiates an alert.

Location Tracking

Devices equipped with GPS or other location technologies can help responders identify a lone worker's location, particularly across large sites or remote environments.

Example: A field engineer experiences an accident while working outdoors. Their device provides location information to help the response team locate them.

Two-Way Audio Communication

Some lone worker devices allow monitoring personnel to communicate directly with the employee, assess the situation and determine the appropriate response.

Example: A healthcare worker activates a discreet alarm after being threatened by an aggressive individual. Where supported, monitoring personnel can establish audio communication and assess what assistance is required.

Tamper and Impact Detection

Certain devices offer additional features that can detect significant impacts or attempts to remove or interfere with the equipment.

Example: A security employee is confronted by an aggressive individual who attempts to remove their alarm device. If supported and correctly configured, tamper detection can trigger an alert to the designated response team.

The availability and operation of these features vary between devices. Automatic alerts should always be supported by clear monitoring and emergency response procedures to ensure appropriate action can be taken when an incident occurs.

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Beyond the De

Providing employees with lone worker alarm devices does not automatically fulfil an employer's health and safety responsibilities.

Without appropriate risk assessments, clear procedures, employee training and effective emergency response arrangements, lone worker protection may remain inadequate.

An alarm device should form part of a wider lone worker safety strategy, not be treated as a complete solution.

How Lone Worker Alarm Devices Support Effective Protection

Lone worker alarm devices can play an important role in employee safety, but their effectiveness depends on how they are integrated into wider protection arrangements.

For example:

  • Company A: Employees are provided with alarm devices, but there are no clear procedures for receiving alerts or arranging assistance.
  • Company B: Employees are provided with suitable alarm devices alongside risk assessments, training and established emergency response procedures.

While both companies have invested in similar technology, Company B has a more comprehensive approach to managing lone working risks.

The key is ensuring that employees have appropriate ways to raise an alert and that someone is responsible for responding. Depending on the working environment and level of risk, this may involve dedicated alarm devices, regular check-ins or other suitable communication arrangements.

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Review Emergency Response Arrangements

Even with suitable lone worker alarm devices in place, ineffective response procedures can undermine employee safety.

Outdated emergency contact details, unclear responsibilities and untested alert procedures can all cause delays when assistance is needed.

Employers should regularly review and test their arrangements to ensure alerts reach the right people and that appropriate action can be taken.

The key question is not simply whether employees have an alarm device, but whether there is an effective response plan behind it.

Lone Worker Protection: More Than an Alarm Device

Effective lone worker protection requires more than simply providing employees with an alarm device. It involves identifying risks, establishing appropriate safety procedures and ensuring that employees can access assistance when needed.

Lone worker alarm devices can be an important part of these arrangements, providing a means of raising an alert in an emergency. However, their effectiveness depends on suitable monitoring, clear responsibilities and established response procedures.

By taking a coordinated approach, employers can strengthen employee safety, improve their ability to respond to incidents and demonstrate that they are taking appropriate steps to manage lone working risks.

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Scutum Recommends

Before selecting a lone worker alarm device, assess the risks associated with lone working, identify higher-risk environments and review the arrangements for responding to an emergency.

The right solution should reflect both the risks employees face and the support available when assistance is needed.

Are your lone worker protection arrangements fit for purpose? Do you have the right alarm devices and response procedures in place to protect your employees?

Request a quote from our experts.