Scarlet TWL-1S Heat Stress Monitor

SCARLET TWL-1S 

The SCARLET TWL-1S is designed to monitor and assess thermal risk levels in both indoor and outdoor environments. Featuring a smart, user-friendly interface, the device enables users to instantly identify thermal risk conditions through an intuitive color-coded display.

The TWL-1S measures air temperature, relative humidity, radiant heat, and wind speed, and applies an advanced Thermal Work Limit (TWL) algorithm to generate clear guidance on work, rest, and hydration requirements. The algorithm and work-rest schedules are fully aligned with the latest international guidelines.

For enhanced safety and operational efficiency, users can perform data logging by connecting the device to a Windows PC via USB. A wireless pager remote alerting system is also available with the TWL-1SR model, ensuring timely notifications even in large or noisy work environments.

Color-Coded Risk Indicators

• Green – Safe for work

• Yellow – Buffer zone / caution

• Red – Unsafe for work

Key Features

Smart, User-Friendly Interface

Unlike conventional meters that only display readings, the SCARLET TWL-1S goes further by interpreting data using TWL theory to determine whether working conditions are safe, marginal, or dangerous.

• Colorful LCD backlight instantly shows risk levels

• Integrated work-rest schedules and fluid intake recommendations

• Built-in countdown timer displays remaining safe working time before rest is required

Automatic Warning & Remote Alerting

The device automatically starts a working timer based on the calculated TWL value. Once the safe working period expires, the system issues alerts to notify personnel to take action.

• Remote pager alerting via 433 MHz wireless technology

• Up to 200 meters coverage in open areas

• Pager functionality available on TWL-1SR model

Enhanced Sensor Protection

To ensure long-term accuracy and durability in harsh environments:

• Sensitive temperature and humidity sensors are protected by a replaceable polypropylene (PP) filter within a solid protective shield

• A silicone pad safeguards the anemometer mechanism from dust and debris

Applications

The SCARLET TWL-1S is ideal for monitoring thermal risk in demanding environments, including:

• Construction Sites

• Tower Cranes

• Outdoor Events

• Port Terminals

• Chemical Plants

• Airports