Parameters:
• T: Air Temperature (°C)
• e: Vapor Pressure (hPa), derived from Temperature and Relative Humidity (RH).
• Adjusted Index: Humidex + Clothing Adj. + Radiant Adj.
OSHA (WBGT Assessment)
Measure or estimate the Wet Bulb Globe Temperature in the work area.
Used for personalized hydration and sweat rate estimation.
Heat Index
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SAFE
Formula Technical Specification (OSHA/ACGIH):
M_adj = M_base × (W / 70) Result = Is WBGT_eff < ACGIH_TLV(M_adj)?
Parameters:
• W: Worker Body Weight (kg)
• M_base: Standard Metabolic Rate (Watts) based on workload classification.
• M_adj: Adjusted Metabolic Rate accounting for body mass.
• WBGT_eff: Effective WBGT (Measured + Clothing Adjustment).
• ACGIH TLV: Threshold Limit Value curve for safe heat exposure.
Atmospheric Monitor (Kata)
Measure the time (s) for the Kata bulb to cool from 100°F to 95°F (38°C to 35°C).
Approx. RH %
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Air Velocity (m/s)
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Dry Cooling Power (H)
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Formula Technical Specification (Kata):
H = F / t H' = F / t'
Parameters:
• F: Kata Factor (etched on the stem)
• t: Dry Cooling Time (seconds)
• t': Wet Cooling Time (seconds)
• H: Dry Cooling Power (mW/cm²)
• H': Wet Cooling Power (mW/cm²)
WBGT Monitoring
WBGT (Wet Bulb Globe Temperature) is the gold standard for heat stress monitoring.