Online Heat Stress Weather Station
Cloud-Based
Heat Monitoring
Weather Station for Heat Monitoring
Weather Station for Heat Monitoring
Online Heat
Safety Solution
Efficient Heat Management
Tracking
Metrics
Alert Status
Remote
Visual Alerts
Remote
Visual Alerts
Why Thermal Work
Limit (TWL) Alerts?
Why Thermal Work
Limit (TWL) Alerts?
- High (TWL < 115)
- Medium (115 < TWL < 140)
- Low (TWL > 140)
Feed Crucial Data to
Your Existing Systems
Feed Crucial Data to
Your Existing Systems
Portable Heat Stress Meter - TWL-1S
Integrable with Your Devices & More Environmental Sensors
Protect Workers from Heat-Related Illnesses
Where does Scarlet TWL-1SV Apply
Specification
- Thermal Work Limit (TWL)
- Wet Bulb Globe Temperature (WBGT)
- Heat Index (HI)
- Globe Temperature
- Dry Bulb Temperature
- Wet Bulb Temperature
- Humidity
- Wind Speed
- Wind Direction
| Item | Description |
| TWL Calculation | Based on Tw, Tg, Ta and WS |
| WBGT Calculation | 0.7 x Tw + 0.2 x Tg + 0.1 x Ta |
| Heat index (HI) | 21 to 45 °C |
| Globe thermometer (Tg) | Range: 0 to 80 °C / Accuracy: ±1.5 °C (15 to 40 °C); ±2.0 °C (others) |
| Dry-bulb temperature (Ta) | Range: -40 to 80 °C / Accuracy: ±0.5 °C |
| Wet-bulb temperature (Tw) calculation | 0 to 66 °C |
| Humidity | Range: 0 to 100 % RH / Accuracy: ±2% |
| Wind speed (WS) | Range: 0 to 40 m/s / Accuracy: ±5% |
| Power supply / consumption | Range: 0 to 359° (no blank sector) / Accuracy: ±3° |
| Memory | Build-in SD card (Backup storage for cloud connection lost) |
| Material casing | Aluminum |
The TWL-1S has been tested and validated by Health Authority – Abu Dhabi in the extreme high temperature and high humidity Gulf region as well as the mines in Australia. The TWL algorithm used by TWL-1S device is the latest version attested by the research team in Curtin University, Australia.
Scenario
Risk assessment for heat-related illness in the worksite is quite essential in high temperature environments. TWL-1S can be applied at outdoor and indoor working environments. For instance, a health and safety officer can place the TWL-1S at the “hot spot” zone in worksite and continuously monitor environmental parameters. With 200 meters transmission distance of wireless signal, the paging system can actively warn safety officers in real time. TWL-1S is able to help managers set work/rest cycle and hydration plans for workers.
As TWL is to mimic the effects of the working environment on laborers, it is suggested the TWL-1S unit should be placed on the worksite where the majority of workers are located. For example, if there is no shade provided on the worksite, the TWL-1S should be exposed to sunlight as most workers are.
However, in order to prolong the machine life, you can place TWL-1S under sunlight while measuring. Before pushing the TWL button, please allow TWL-1S at least 10 minutes in the working environment to get balance. After the TWL level shows up, you can put it back to shade.
The TWL is the thermal work limit. It’s an advanced heat stress index and research found it more useful in workplaces.
The TWL predicts the maximum level of work that can be carried out in a given environment, without workers exceeding a safe core body temperature 38.2 °C (100.8 °F) and sweat rate (< 1.2 kg or 2.6 lb per hour). WBGT does not incorporate a direct measure of wind speed and requires estimation of metabolic rates, which can have a margin of error up to 50%. Heat stress indexes such as WBGT and ISO 7933 do not take into account the effects of long hours of hard work, dehydration, or the impact of personal protective clothing and equipment. WBGT and heat index are too conservative and inappropriate for practical in the extreme working environments such as Middle East countries or high-temperature process industry or mines. Scarlet TWL-1S incorporated both WBGT and TWL index features. You can simply switch heat indices for your need.
Our Customers
What Our Clients Say
TWL-1S’s friendly user interface has assisted me a lot in implementing the new occupational heat exposure prevention system in the field. This is one of the key elements to success.
Since Commencing the heat stress management program in November 2013, the project has not had a SINGLE CASE of a heat stress related illness despite air temperatures of 45 degrees.
Companies in Abu Dhabi should comply with EHSMS heat safety standards by adopting thermal work limit (TWL) for risk assessment of heat working environment.