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Madeheatstressmanagementeasy
Heat Stress Monitor
TWL1 s
Scarlet Tech
Designing portable instruments
Founded in 2011,Taipei,Taiwan
scarlet.com.tw
Connecting to international acade...
TWL1 s
Measure Environment
Calculate Heat Index
&
Measure
Environment
Web bulb temperature (Tw)
Air temperature (Ta)
Globe temperature (Tg)
Wind speed (WS)
Sample parameter...
Mandatory
© Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712
4 Sensors
GLOBE RH%
TEMP WIND
Globe
Temperature
Small 3”black ball, for portable
Range 0...80℃
Accuracy ±1.0℃ (15...40℃)
Built-in correction factor for ...
Relative
Humidity
Capacitive sensor, small and responsive
Range 5...95%rh
Accuracy ±3% @ (10...90 %rh) 25℃
Capacitive sens...
AirTemperature
Small size, industrial spec
Range 0...60℃
Accuracy ±0.6℃
NTC type thermistor
Beneath globe. Prevent from ra...
Wind Speed
Wind cup. No worries about wind direction
Range 0.5...10 m/s
Accuracy ±(2% reading + 0.2) m/s
Wind tunnel lab c...
indoor
4 Calculations
WET
BULB
WBGT
WBGT
outdoor
TWL
indoor
WBGT
WBGT
outdoor
WBGT
The US Army proposedWBGT in 1957
Comply with ISO 7243, ACGIHTLV, ISO 7730
WBGT indoor = 0.7 ...
everything in one device
Best solution
four sensors
wet bulb measure RH: 5-95% accuracy 0.1%
calculator
globe 0-80℃, accur...
dashboard
Best solution
© Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712
3-color LCD backlight R/Y/G indic...
data logger
Best solution
© Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712
logger TWLIT
For research purpo...
sensor protection
Best solution
© Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712
protect rh sensor
Polypro...
calibration & parts
Services
© Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712
humidity wind cup
>> Calibra...
Free PC Software
Portability is Considered
EN 61326-1:2006
(IEC/EN61000-4-2 (2009)/
-3 (2006 + A2:2010))
Electrical Equipment for
Measurement,
Control and Laboratory...
Middle East includes Abu Dhabi,
Dubai, Oman, Iran, KSA. Australia
and New Zealand
Region Industry
Construction, oil and ga...
Brand
Our Customers
CustomerVisiting
We visited 100+ companies in 18 months
Construction
Reach 50 °C in summer.
Risk assessment is
mandatory and essential
Abu Dhabi
Municipality
Safety in the heat conference.
Scarlet was invited and had a
booth
Plastic Plant
Introduction and training
Dubai, UAE
World Expo 2020
Introduction and training
Road Construction
Introduction and training
Mall Beside F1Track
Cement Plant
Metal Manufacture
Cable Factory
Reach 60 °C @ 2 meter.
Heat risk assessment is
mandatory
Improvement
Validation
Increase ventilation in the site
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Scarlet Tech Heat Stress Management by using Thermal Work Limit (TWL) 2015

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The TWL is an integrated measure of the dry bulb, wet bulb, wind speed and radiant heat. From these variables, and taking into consideration the type of clothing worn and acclimatization state of the worker, 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 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 extreme working environment 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.
Visit Scarlet for more details www.scarlet.com.tw

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Scarlet Tech Heat Stress Management by using Thermal Work Limit (TWL) 2015

  1. 1. Madeheatstressmanagementeasy Heat Stress Monitor TWL1 s
  2. 2. Scarlet Tech Designing portable instruments Founded in 2011,Taipei,Taiwan scarlet.com.tw Connecting to international academy Fusing medical knowledge and technology taste Coordinate local manufactures to implement the design
  3. 3. TWL1 s Measure Environment Calculate Heat Index &
  4. 4. Measure Environment Web bulb temperature (Tw) Air temperature (Ta) Globe temperature (Tg) Wind speed (WS) Sample parameters TEMP FELT TEMP WBGT TWL Calculate Heat Index Give scientific-based index
  5. 5. Mandatory © Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712
  6. 6. 4 Sensors GLOBE RH% TEMP WIND
  7. 7. Globe Temperature Small 3”black ball, for portable Range 0...80℃ Accuracy ±1.0℃ (15...40℃) Built-in correction factor for standard 6” Reach 90% equilibrium in 7 min
  8. 8. Relative Humidity Capacitive sensor, small and responsive Range 5...95%rh Accuracy ±3% @ (10...90 %rh) 25℃ Capacitive sensor 140pF±40pF Responsive.Took 12 sec from 10% to 80%
  9. 9. AirTemperature Small size, industrial spec Range 0...60℃ Accuracy ±0.6℃ NTC type thermistor Beneath globe. Prevent from radiation heat
  10. 10. Wind Speed Wind cup. No worries about wind direction Range 0.5...10 m/s Accuracy ±(2% reading + 0.2) m/s Wind tunnel lab calibrated Optical method (IR) to read out RPM
  11. 11. indoor 4 Calculations WET BULB WBGT WBGT outdoor TWL
  12. 12. indoor WBGT WBGT outdoor WBGT The US Army proposedWBGT in 1957 Comply with ISO 7243, ACGIHTLV, ISO 7730 WBGT indoor = 0.7 xTw + 0.3 xTg Wet Bulb GlobeTemperature WBGT outdoor = 0.7 xTw + 0.2 xTg + 0.1Ta
  13. 13. everything in one device Best solution four sensors wet bulb measure RH: 5-95% accuracy 0.1% calculator globe 0-80℃, accuracy 0.1℃ Wind 0.5-10 m/s, accuracy 0.1 m/s Dry bulb 0-50℃, accuracy 0.1℃ © Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712 table Zone Risk Level Cycle (min) TWL ≥ 140 Low Continuous* 115 ≤ TWL < 140 Medium Continuous* TWL < 115 High 20 work - 40 rest
  14. 14. dashboard Best solution © Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712 3-color LCD backlight R/Y/G indicates risk level Risk icons is readable alternative in sunlight On screen timer is helpful for safety manager to schedule work-rest cycle based on TWL value innovative display
  15. 15. data logger Best solution © Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712 logger TWLIT For research purpose For build up database of forecast Configurable sample rate: 10 min to 4 hr/data Standard mini USB connector PC software to download data and setup device Download data in zero click. Simple Configure device name Configure sampling rate Export CSV for Excel analysis 210 255 300 12.06 12:36 13:06 13:36 TWL RH (normalized)
  16. 16. sensor protection Best solution © Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712 protect rh sensor Polypropylene (PP) film allows vapor going through but blocks fine dust and dirt. So vapor and moisture reach sensor but particles don’t. This design is to extend the life of sensor in harsh environment. Protect anemometer bearing A silicone pad clamped on top of the plate of wind miller plate. This prevents the bearing inside of the structure from dust and other particles. Compare to competitors, this effectively extends the sensor life.
  17. 17. calibration & parts Services © Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712 humidity wind cup >> Calibration Should calibrate every 6 months. Local agent or clients can do it. >> Parts Pp filter is suggested to be replaced every 2 to 4 weeks in heavy usage. By order. Dry/globe bulb >> Calibration Calibration drift of thermistors are negligible. No need to calibrate. >> Parts Black ball along with thermistor is replaceable. By order. >> Calibration Local calibration is not feasible due to wind tunnel costs. >> Quick check Hold device and walk 5 meters in 10 sec and make sure the cups keep rotating. >> Parts Wind cup and bearing is replaceable. By order.
  18. 18. Free PC Software
  19. 19. Portability is Considered
  20. 20. EN 61326-1:2006 (IEC/EN61000-4-2 (2009)/ -3 (2006 + A2:2010)) Electrical Equipment for Measurement, Control and Laboratory Use Certification
  21. 21. Middle East includes Abu Dhabi, Dubai, Oman, Iran, KSA. Australia and New Zealand Region Industry Construction, oil and gas, open- cut mining, aluminum ,glass, forest management, cement, transportation, government Our Customers
  22. 22. Brand Our Customers
  23. 23. CustomerVisiting We visited 100+ companies in 18 months
  24. 24. Construction Reach 50 °C in summer. Risk assessment is mandatory and essential
  25. 25. Abu Dhabi Municipality Safety in the heat conference. Scarlet was invited and had a booth
  26. 26. Plastic Plant Introduction and training
  27. 27. Dubai, UAE World Expo 2020 Introduction and training
  28. 28. Road Construction Introduction and training
  29. 29. Mall Beside F1Track
  30. 30. Cement Plant
  31. 31. Metal Manufacture
  32. 32. Cable Factory Reach 60 °C @ 2 meter. Heat risk assessment is mandatory
  33. 33. Improvement Validation Increase ventilation in the site

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