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EM-HD32.2, EM-HD32.2A Heat Stress WBGT analysis

EM-HD32.2 – WBGT Index is an instrument for the analysis of WBGT index (Wet Bulb Glob Temperature: wet bulb temperature and globe thermometer
temperature) in presence or in absence of solar radiation.
Reference Regulations:
ISO 7243: Hot environments. Estimation of the heat stress on working man, based on
WBGT index (wet bulb temperature and Globe thermometer).
ISO 8996: Ergonomics of the thermal environment – Determination of the energy
metabolism.
ISO 7726: Ergonomics of the thermal environment – Instruments for measuring
physical quantities.

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Product Description

EasyMeasures EM-HD32.2 – WBGT Index is an instrument  for the analysis of WBGT index (Wet Bulb Glob Temperature: wet bulb temperature and globe thermometer temperature) in presence or in absence of solar radiation.
Reference Regulations:
ISO 7243: Hot environments. Estimation of the heat stress on working man, based on
WBGT index (wet bulb temperature and Globe thermometer).
ISO 8996: Ergonomics of the thermal environment – Determination of the energy
metabolism.
ISO 7726: Ergonomics of the thermal environment – Instruments for measuring
physical quantities.
The instrument is provided with three inputs for probes module: the module interface between the instrument and sensor connected and communicate
the sensor parameters and calibration data to the instrument.
All probes can be connected to any of the instrument’s inputs, they are automatically recognized upon turning the Instrument on.
The main features of the instrument are:
• Logging: data acquisition and logging to the internal instrument memory. Storage
capacity: 64 different logging sections, sample interval, user selectable.
• You can set the automatic logging start with auto-start function (Start/Stop time).
• The measurement unit of the temperature: °C, °F, °K.
• The display of maximum, minimum, medium statistic parameters.
• The data transfer via the RS232 or USB serial ports.
HD32.2 instrument can detect simultaneously the following quantities:
• Globe thermometer temperature Tg.
• Wet bulb temperature with natural ventilation Tn.
• Environment temperature T.
Starting from the detected values, HD32.2 can calculate:
• WBGT(in) index (Wet Bulb Glob Temperature: wet bulb temperature and Globe
thermometer) in absence of solar radiation.
• WBGT(out) index (Wet Bulb Glob Temperature wet bulb temperature and Globe
thermometer) in presence of solar radiation.
WBGT index
WBGT (Wet Bulb Globe Temperature – Wet bulb temperature and globe thermometer)
is one of the indexes used to determinate the occupational heat exposure.
It represents the value, related to the metabolic expenditure linked to a specific work
activity, that causes a thermal stress when exceeded.
WBGT index combines the temperature measurement of wet bulb with natural ventilation with the globe thermometer and, in some situations, with the air temperature.
The calculation formula is the following:
• inside and outside a buildings in absence of solar radiation:
WBGT close environments = 0,7 tnw + 0,3 tg
• outside a building in presence of solar radiation:
WBGToutside environments= 0,7 tnw + 0,2 tg + 0,1 ta
where:
tnw = natural wet bulb;
tg = globe thermometer temperature;
ta = air temperature.
The measured data should be compared with the limit values prescribed by the regulations;
when exceeded you have to:
• reduce directly the thermal stress on the examined work place;
• proceed to a detailed analysis of the thermal stress.
In order to measure the WBGT index, the following probes should be connected:
• Natural wet bulb HP3201.2 (HP3201).
• TP3276.2 Globe thermometer probe (TP3276 or TP3275).
• TP3207.2 (TP3207) Dry bulb temperature, if the measurement is performed in
presence of solar radiation.
In order to measure the WBGT index, you should refer to the following regulations:
• ISO 7726
• ISO 7243
• ISO 8996
Technical features
Instrument
Dimensions 185x90x40 mm
(Length x Width x Height)
Weight 470 g (batteries included)
Materials ABS, rubber
Display back light, with dot-matrix
160×160 points, visible area 52x42mm

Download

Manuals and Brochures here.  

HD32_2_WBGT_INDEX.pdf

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