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SCARLET HEAT STRESS METER, TWL-1S

The TWL-1S is used to monitor and assess thermal risk level indoor and outdoor. It has a smart user-friendly interface which allow users to instantly identify the thermal risk level result based on different colors. Users can also do data logging directly by connecting the device to windows PC via the USB cable.

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

The TWL-1S is used to monitor and assess thermal risk level indoor and outdoor. It has a smart user-friendly interface which allow users to instantly identify the thermal risk level result based on different colors. Users can also do data logging directly by connecting the device to windows PC via the USB cable.

Scarlet TWL-1S is designed to measure WBGT and thermal work limit (TWL) heat index. The TWL measures air temperature, humidity, radiant heat and wind speed to come up with instructions for work, rest and hydration plan. We integrate the algorithm of TWL and work-rest schedule based on the latest guideline. The user-friendly interface even showed different colors to ensure users in line with TWL schedule. For example, red means unsafe for work, yellow means buffer zone and green means safe for work.

Meters were supposed to sense the targets and give readings. Scarlet intends to do more. TWL theory determines the threshold for a 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.

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

Model: Heat Stress TWL-1S

Download Datasheets

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)