Managing SX.e and TWL with scripts and MARC Jeremiah Curtis.
Scarlet Tech Heat Stress Management by using Thermal Work Limit (TWL) 2015
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Transcript of Scarlet Tech Heat Stress Management by using Thermal Work Limit (TWL) 2015
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Made heat stress management easyHeat Stress Monitor
TWL 1 s
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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
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TWL 1 sMeasure Environment
Calculate Heat Index&
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Measure Environment
Web bulb temperature (Tw)
Air temperature (Ta)
Globe temperature (Tg)
Wind speed (WS)
Sample parameters
TEMP FELTTEMP
WBGT TWL
Calculate Heat IndexGive scientific-based index
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Mandatory
© Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712
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4 Sensors
GLOBE RH%
TEMP WIND
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Globe TemperatureSmall 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
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Relative HumidityCapacitive 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%
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Air TemperatureSmall size, industrial spec
Range 0...60℃Accuracy ±0.6℃
NTC type thermistor
Beneath globe. Prevent from radiation heat
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Wind SpeedWind 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
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indoor
4 Calculations
WETBULB WBGT
WBGToutdoor
TWL
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indoorWBGT
WBGToutdoor
WBGT
The US Army proposed WBGT in 1957
Comply with ISO 7243, ACGIH TLV, ISO 7730
WBGT indoor = 0.7 x Tw + 0.3 x Tg
Wet Bulb Globe Temperature
WBGT outdoor = 0.7 x Tw + 0.2 x Tg + 0.1 Ta
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everything in one deviceBest 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
tableZone Risk Level Cycle (min)
TWL ≥ 140 Low Continuous*
115 ≤ TWL < 140 Medium Continuous*
TWL < 115 High 20 work - 40 rest
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dashboardBest solution
© Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712
3-color LCD backlight R/Y/G indicates risk levelRisk icons is readable alternative in sunlightOn screen timer is helpful for safety manager to schedule work-rest cycle based on TWL value
innovative display
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data loggerBest solution
© Scarlet Tech Co. Ltd. 2013 www.scarlet.com.tw +886 2 2325 7712
logger TWLIT
For research purposeFor build up database of forecastConfigurable sample rate: 10 min to 4 hr/dataStandard mini USB connector
PC software to download data and setup device Download data in zero click. SimpleConfigure device nameConfigure sampling rateExport CSV for Excel analysis
210
255
300
12.06 12:36 13:06 13:36
TWL RH (normalized)
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sensor protectionBest 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.
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calibration & partsServices
© 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.
>> PartsPp 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.
>> PartsBlack ball along with thermistor is replaceable. By order.
>> Calibration Local calibration is not feasible due to wind tunnel costs.
>> Quick checkHold device and walk 5 meters in 10 sec and make sure the cups keep rotating.
>> PartsWind cup and bearing is replaceable. By order.
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Free PC Software
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Portability is Considered
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EN 61326-1:2006(IEC/EN61000-4-2 (2009)/
-3 (2006 + A2:2010)) Electrical Equipment for
Measurement, Control and Laboratory Use
Certification
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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
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Brand
Our Customers
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Customer VisitingWe visited 100+ companies in 18 months
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ConstructionReach 50 °C in summer.
Risk assessment is mandatory and essential
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Abu Dhabi Municipality
Safety in the heat conference. Scarlet was invited and had a
booth
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Plastic PlantIntroduction and training
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Dubai, UAEWorld Expo 2020
Introduction and training
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Road ConstructionIntroduction and training
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Mall Beside F1 Track
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Cement Plant
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Metal Manufacture
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Cable FactoryReach 60 °C @ 2 meter. Heat risk assessment is
mandatory
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ImprovementValidation
Increase ventilation in the site