ESIM2.0 Environmental Stress Index Monitor

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  • 2015

  • Product
    Medical and Scientific

Designed By:

  • Ideation Design

Commissioned By:

DSTO and Ideation Product Solutions Pty Ltd

Designed In:

Australia

The ESIM2.0 is a portable heat stress monitoring device which calculates an Environmental Stress index as an equivalent to WBGT. Unlike traditional WBGT measuring devices, it’s portable and rugged design mean that it can be used in the field for the determination of safe work rates. The ESIM2.0 uses three parameters; solar intensity, air temperature and relative humidity to calculate an index equivalent to WBGT. ESIM2.0 uses a unique algorithm to calculate the relative weight of each parameter to represent its influence on the human body’s ability to cope with heat. The index is read in conjunction with the tables where the appropriate actions can be taken to implement the correct hydration/work/rest regime.


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  • Product created in the smallest ergonomic package with a TPE over-mould to eliminate LCD, button and solar radiance seals and to ensure good user grip and ruggedise housings. The temperature/humidity sensor assembly has a flashing LED during the sensing time as a visual prompt to indicate the 20 second sampling duration. Easy to read LCD with LED backlighting for daylight conditions.

  • Specifically designed for defence applications, the ESIM2.0 can be a vital tool in other areas where Occupational Health and Safety regulations dictate limits on Heat Stress in the workplace. The design is small, robust, light weight and fits into the soldiers harness to ensure real time readings can be made to ensure the correct work regime for the tasks and conditions. Light weight, easy to use, twist cap to expose temperature and humidity sensors for sampling conditions and a single button function to initiate a reading. Automatically times out after use, shuts down until activated for the next reading.

  • Electronics designed to be intrinsically safe. Housing is designed to Australian Defence Standard 11005 Issue 1 Type T. for the most arduous conditions. The ESIM has integrated data logging with time/date sampling allowing traceability of operational data, eliminating the need for manual recording by an operator. This feature in particular is very important when assessing whether or not operational procedures have been followed when heat stress incidents have occurred.

  • The unit has been designed for dis-assembly with the components easily dismantled into their individual components for recycling. The product does have a very long life expectancy with the re-calibration of sensors to ensure the repeated accuracy over an extended product life. Replaceable batteries provide at least 2500 hours of typical use.

    The product has been made from high quality polycarbonate plastic and TPE to give the durable and rugged performance required for sustained use in hostile environments. The product configuration of polycarbonate housings, TPE seals and over-mould top housing give a rating code of IP674. All external components are screwed together with a gasket seal between each to ensure no breach of the integrity occurs during the strict testing regime.

    Occupational Health and Safety, and the effect of heat stress on personal health and performance is an essential consideration in many industry sectors. Although, ESIM2.0 is specifically designed for Defence applications, the ESIM2.0 can be a vital tool in other, where Occupational health and Safety regulations dictate limits on Heat Stress in the work place.

    The WBGT index is used in conjunction with charts/tables that have been compiled by data gathered by the US armed forces for over 50 years. The data has been derived traditionally by the use of larger and more fragile devices that take measurements of radiant heat exposure by a dry bulb sensor and a wet bulb sensor to take into account the evaporative cooling effect on an individual. The ESIM2 uses three parameters; solar intensity, air temperature and relative humidity to calculate an index equivalent to WBGT. The WBGT is a composite heat index, the ESIM2 uses a unique algorithm to calculate the relative weight of each parameter to represent its influence on the human body's ability to cope with heat.