TWL-1SV Heat Stress Weather Station
Proactive Heat Safety Measurement with TWL, WBGT, and Heat Index
Protect Workers from Heat Stress
Heat illness can develop quickly in high-temperature working environments, putting worker safety and productivity at risk. TWL-1SV provides real-time TWL, WBGT, and Heat Index monitoring with visible heat risk warnings, browser and email notifications, and online access through the Scarlet web portal to help teams respond faster and manage heat risks more effectively.
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Globe Temperature Sensor
Measures radiant heat temperature for accurate heat stress assessment.
Ultrasonic Wind & Weather Sensor
Monitors wind speed and direction, even in low-wind conditions, along with air temperature and relative humidity.
Digital Signage & Alerts
Displays heat stress indices and TWL heat risk alerts through the built-in LED display.
How It Works
Continuous Heat Monitoring
Set-Up & Start Measurement
Mounted on a tripod for fixed deployment, TWL-1SV continuously measures heat stress conditions. The LED display shows real-time data and alerts visible to everyone at the worksite.
Data Logging & Export
Keep Accurate Records of Every Reading
TWL-1SV automatically logs data the moment it powers on. Extract via SD card and view in Excel format, or access cloud-based logs remotely through the Scarlet Web Portal to review and export from anywhere.
Remote Heat Risk Alerts
Web Portal Push Email Notifications
Teams can access the Scarlet web portal to monitor heat stress conditions remotely. During high-risk conditions, TWL-1SV sends browser and email notifications for faster response and improved worksite safety.
Multi-Site Monitoring Hub
Simplify Heat Management for All Projects
Connect multiple TWL-1SV devices to the Scarlet web portal for centralized heat monitoring across different worksites, enabling teams to manage heat risks more efficiently.
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Experience online heat monitoring with the TWL-1SV.
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Access Web Portal – Free Demo
You can explore the Scarlet Heat Monitoring Portal for free by visiting the demo site. Simply go to twl.scarlet-tech.com, log in using the account demo2@scarlet-tech.com and password demoTWL to try out the web portal’s features.
Comply with Heat Safety Guidelines
Public health authorities in the UAE and Saudi Arabia have incorporated the Thermal Work Limit (TWL) index into their heat safety guidelines. Furthermore, leading enterprises such as Abu Dhabi National Oil Company (ADNOC), Emirates Group, and Al Fara’a General Contracting (AFGCO) have relied on the TWL-1S to prevent heat-related illnesses among their workers.
Instant Heat Stress Alerts
TWL-1SV provides instant heat stress alerts through visual risk indicators, browser and email notifications, and relay-triggered external warning devices to support faster response during high-risk conditions.
TWL – A Better Heat Index for Worksite Safety
Thermal Work Limit (TWL) is a heat stress index designed to reflect real worksite conditions, helping teams manage safe work intensity, hydration, and heat risk more effectively. Learn more about Thermal Work Limit (TWL) in this article.
Integrate Seamlessly with Your Existing Systems
Transmit TWL-1SV data through RS485/Modbus for integration with control systems, serial output devices, and external LED signage to support centralized heat safety monitoring.
Frequently Asked Questions
Find quick answers below, or visit our FAQ page for more.
What is TWL?
TWL stands for Thermal Work Limit, an advanced heat stress index widely recognized for its effectiveness in workplace safety.
Where should the TWL-1SV be installed?
Install the TWL-1SV where most workers are located. After powering on, let it stabilize for at least 10 minutes before checking the TWL levels to allow the device to fully adapt with the heat conditions.
How many TWL-1SV devices can be connected to the web portal?
There is no limit. You can connect as many TWL-1SV devices as needed for remote monitoring.
Specifications
- Measurements
- System
- Cloud Portal
- Features
- Package List
- FAQ
- Download
| Item | Description |
|---|---|
| TWL Calculation | Based on Tw, Tg, Ta and WS |
| WBGT Calculation | ISO 7243: Outdoor & Indoor |
| Heat Index (HI) | US NOAA / NWS Matrix: 21 to 45 °C |
| Globe Thermometer (Tg) | 0 to 80 °C (±1.5 °C typ.) |
| Dry-Bulb Temperature (Ta) | -20 to 90 °C (±1.5 °C accuracy) |
| Wet-Bulb Temperature (Tw) Calculation | 0 to 66 °C (Calculated) |
| Humidity | 0 to 100% RH (±2% accuracy) |
| Wind speed (WS) | 0 to 40 m/s (±5% accuracy) |
| Wind Direction (WD) | 0 to 359° full tracking |
| Wind Analytics | Gust / 2-min avg / 10-min avg wind speed |
| Other Indices | Air Pressure / Outdoor Dewpoint / Wind Chill |
| Item | Description |
|---|---|
| Power Supply | 100 to 240V AC (Default); Solar panel and battery pack (Optional) |
| Measurement Frequency | 2 minutes (in accordance with TWL measurements) |
| Connectivity | Ethernet (RJ45) / 2.4GHz Wi-Fi / 4G LTE |
| Display | 16-inch Full-Color Outdoor LED Signage |
| Memory & Storage | Pre-installed 8GB microSD (Offline cloud backup) |
| Alarm | Configurable thresholds for LED color change & relay trigger |
| Relay Output | 12VDC Wet Contact (Max. 150mA) |
| Degree of Protection | Sensor: IP67 (Waterproof); Console / Main Body: IP65 (Water-resistant) |
| Dimensions | Device: 20 × 45 × 60 cm / Tripod: 100 to 200 cm height |
| Weight | Approx. 10 kg (22 lbs) |
| Item | Description |
|---|---|
| Liveview Dashboard | Real-time visual tracking via cross-platform web browser (PC/tablet/mobile) |
| Multi-Device | Supports centralized management for multiple stations |
| Data Refresh | Every 2 minutes |
| Alert Notification | Instant Email & visual alert on dashboard |
| Cloud Datalogging | Historical trend chards and table views |
| Data Export | PC-compatible CSV format for advanced analysis |
| User Access | Admin and viewer permission control |
| Data Security | Encrypted HTTPS connection hosted on AWS |
| Features |
|---|
| ▪ Measure TWL, WBGT, Heat Index |
| ▪ Live LED signage for instant monitoring & alert |
| ▪ Remote real-time monitoring via the internet |
| ▪ Get instant heat stress alerts via web or email |
| ▪ Historical data backup on device and web portal cloud |
| ▪ Ensure OSHA compliance for heat safety |
| Package List |
|---|
| ▪ TWL-1SV weather station |
| ▪ Tripod |
| ▪ User guide |
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TWL stands for Thermal Work Limit, an advanced heat stress index widely recognized for its effectiveness in workplace safety. It has been one of the key measure in heat stress programs at Abu Dhabi.
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Because factors like humidity and sun exposure significantly affect how hot your body actually feels. A heat stress meter accounts for all of these, providing a more accurate assessment of environmental heat risk
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Yes, the TWL-1SV provides visual heat level alerts directly on the device, and it also supports email notifications through the web portal’s online monitoring settings.
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The TWL‑1SV transmits all data to the cloud for remote monitoring on Scarlet’s web portal. It connects to the internet via an RJ45 LAN port. TWL-1SV can also be integrated with PCs or existing systems using a serial port through MODBUS/RS485 communication protocols. This dual connectivity makes it flexible for both online access and local system integration.
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There is no limit. You can connect as many TWL-1SV devices as needed for remote monitoring.
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Since TWL mimics the working environment’s impact on laborers, TWL-1SV unit should be placed where most workers are located. For example, if the worksite lacks shade, TWL-1SV should be in direct sunlight to reflect actual conditions.
When beginning measurement, let the TWL-1SV stabilize for at least 10 minutes before checking the TWL levels for more precise readings and to allow the device to fully adapt to the surrounding conditions.
Our Clients
Portable Heat Stress Meter – TWL-1S
TWL-1S is a portable heat stress meter designed to measure WBGT and TWL heat indices on-site. This compact device provides you with instructions for work, rest, and hydration plans. The user-friendly interface is shown in tri-colors backlight with information to alert HSE managers if the environment is safe for workers to work.
Industries
Heat stress meters are used across industries where workers face extreme heat. From construction and road work to port operations, building maintenance, and outdoor events — these devices help monitor environmental conditions and protect people working under intense heat.
Construction
Construction workers often face extreme heat, particularly in summer or high-temperature regions. Heat stress meter helps to monitor conditions, schedule breaks, implement cooling measures, and ensure proper hydration.
Building
Building maintenance workers operating in poorly ventilated spaces, rooftops, or during exterior work in summer face heat stress risks. A heat stress meter monitors these conditions, ensuring safety by prompting necessary breaks and providing cooling solutions to maintain health and efficiency.
Port
Port workers loading and unloading cargo are often exposed to heat, especially on metal surfaces that amplify radiant heat. A heat stress meter ensures real-time monitoring of temperature and humidity, helping managers enhance workers' heat safety.
Outdoor events
Event staff at outdoor venues often work long hours under direct sunlight. Heat stress meters help organizers monitor conditions, ensuring a safe and comfortable environment for both staff and attendees.
Traffic road
Road workers frequently face intense heat, with asphalt surfaces intensifying temperatures during long hours outdoors. Using heat stress meters allows teams to monitor environmental conditions in real time, ensuring they can take necessary precautions such as staying hydrated, taking breaks in shaded areas.
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