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Heat Stress Meter

TWL-1S Heat Stress Meter Image

Compact DesignCOMPACT DESIGN

TWL-1S is designed for all kinds of worksites including mining and construction. All devices have been tested in rigid environment settings.

Smart DeviceSMART DEVICE

Our product is based on the scientific research and algorithm, which gives user built-in risk level flags and instruction for work, rest and hydration.

Quickstart DataloggerQUICKSTART DATALOGGER

Free software allows users to download data on TWL and WBGT; air temperature, humidity, wind speed, globe and wet bulb temperature.

Worldclass StandardsWORLD CLASS STANDARDS

We ensure every devices with calibration providing accurate and reliable readings. The 3rd Party Certification is available upon request.

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User-Friendly Dashboard

Meters were supposed to sense the targets and give readings. Scarlet intends to do more. TWL theory determines the threshold for safe, fair, and dangerous working environment. Colorful LCD backlight tells you the risk level based on the TWL value. Work-rest schedule and fluid intake are integrated into the display. A countdown timer shows the time remaining before a recommended rest.

Automatic Warning (TWL-1SR Model)

The working timer starts counting according to TWL value. When it expired, the device will notify the pager carriers remotely. It reminds you to take actions. 433 MHz technology is used to offer better penetration ability and 200 meter coverage in an open area is achieved. Please note that pager is available in TWL-1SR model.

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Sensor Protection

Delicate temperature and humidity sensor are well protected by a replaceable polypropylene (PP) filter in a solid shield, exempted the sensors from dust damage and external strike. A silicone pad protects the mechanism of anemometer from dust.

DATA LOGGER

loggerlogoTWL-1S can record data with configurable sampling rate from 10 minutes to 3 hours. PC side software automatically convert data into CSV format and helps download the data for further analysis using other analytical tools, and it also synchronizes the date and time of the device with PC.

OPTIMIZED GLOBE

globelogoTWL theory considers mean radiant temperature (MRT), the most important parameter on human energy balance. The smaller the surface area of the black bulb, the greater the effect of the air temperature and velocity is, thus causing inaccuracy. The 7.5 cm globe bulb is the optimal size based on our research.

ALL-DIRECTION WIND CUP

cuplogoCup anemometer captures winds from any direction. You do not have to manually decide the wind direction before measuring the wind speed. Compared to the impeller, wind cup is not restricted to the direction of the wind. It considers all the horizontal components of winds that move the anemometer.

TWL Specifications

Measurements

  • Wet Bulb Globe Temperature (WBGT)
  • Thermal Work Limit (TWL)
  • Globe Temperature
  • Dry Bulb Temperature
  • Relative Humidity
  • Wet Bulb Temperature
  • Wind Speed

Item

Description

Air Temperature Range 0…60 °C / Accuracy ±0.6 °C
Globe Bulb Indoor Range 0...80 °C / Accuracy ±1.0 °C (15...40 °C); ±1.5 °C (others)
Globe Bulb Outdoor Range 0...80 °C / Accuracy ±1.5 °C (15...40 °C); ±2.0 °C (others)
Relative Humidity Range 5...95 %rh / Accuracy ±3% (at 25 °C; 10...90 %rh) ±5% (others)
Wind Speed Range 0.5...10 m/s / Accuracy ±(2% of reading + 0.2) m/s
Dimensions Body 59 x 37 x 316 mm (w x d x h). Wind cup (top view) diameter 182 mm
Operating range electronics -10…60 °C
Accuracy at 23 ±5 °C ±1.0 %rh / ±0.2 K
Power supply / consumption 4 AAA 3V battery, power supply 6 mA consumption without lighting
Probe protection Polypropylene plastic cage
Measurement interval 2 seconds
Data logger Yes. Min data rate 1 min up to 60 min, 2,000 data.
Connection Interface Mini USB (UART)
Calibration / adjustment Scarlet calibration kit
Wireless Connection (Optional) 433 MHz (TWL-1SR Model)

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.

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