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  • HD32.2 WBGT Index - HD32.3 WBGT-PMV AREA HEAT STRESS MONITOR

HD32.2 WBGT Index - HD32.3 WBGT-PMV AREA HEAT STRESS MONITOR

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16 / 12 / 2019
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Detail HD32.2 WBGT Index - HD32.3 WBGT-PMV AREA HEAT STRESS MONITOR

Area heat stress monitor data logger alat untuk mengukurindex suhu ruangan dengan menggunakan sensor bola basah dan kering sangat cocok di ruangan kerja. Description HD32.2 – WBGT Index is an instrument made by Delta Ohm srl 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 with SICRAM module: the SICRAM module interface between the instrument and sensor connected and communicate the sensor parameters and calibration data to the instrument. All SICRAM probes can be plugged into any of the inputs: they are automatically recognized upon turning the Instrument on. The main features of the instrument are: • Logging: data acquisition and logging to the integral 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. • Date and time of the instrument. • The display of maximum, minimum, medium statistic parameters and their deletion. • The data transfer speed via the RS232 serial port. 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 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 tnw with the globe thermometer tg and, in some situations, with the air temperature ta. 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. • TP3276.2 Globe thermometer probe. • TP3207.2 Dry bulb temperature, of 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 160x160 points, visible area 52x42mm Working conditions Working temperature -5 … 50° C Storage temperature -25 … 65° C Working relative humidity 0 … 90% RH no condensation Protection Degree IP67 Instrument uncertainty ± 1 digit @ 20° C Power supply Mains power supply ( code SWD10) 12Vdc/ 1A Batteries 4 batteries 1.5V type AA Autonomy 200 hours with 1800mAh alkaline batteries Power absorbed with < 45¼ A instrument off Safety of the stored data unlimited TP3207.2 Temperature probe Sensor type: Pt100 with thin-film Accuracy: Class 1/ 3 DIN Measurement range: -40 ÷ 100 ° C Resolution: 0.1° C Temperature drift @ 20° C: 0.003% / ° C Drift after 1 year: 0.1° C/ year Connection: 4 wires plus SICRAM module Connector: 8 female poles DIN45326 Dimensions: Ø = 14 mm L= 150 mm Response time T95: 15 minutes TP3276.2 Globe thermometer probe Ø = 50 mm Sensor type: Pt100 Accuracy: Class 1/ 3 DIN Measurement range: -10 ÷ 100 ° C Resolution: 0.1° C Temperature drift @ 20° C: 0.003% / ° C Drift after 1 year: 0.1° C/ year Connection: 4 wires plus SICRAM module Connector: 8 female poles DIN45326 Stem dimensions: Ø = 8 mm L= 170 mm Response time T95: 15 minutes HP3201.2 Natural ventilation wet bulb Sensor type: Pt100 Accuracy: Class A Measurement range: 4 ° C ÷ 80 ° C Resolution: 0.1° C Temperature drift @ 20° C: 0.003% / ° C Drift after 1 year: 0.1° C/ year Connection: 4 wires plus SICRAM module Connector: 8 female poles DIN45326 Stem dimensions: Ø = 14 mm L= 170 mm Braid length: 10 cm. at least Tank capacity: 15 cc. Tank autonomy: 96 hours with RH= 50% , t = 23° C Response time T95: 15 minutes Connections Input for probes with SICRAM module 3 Connectors 8 male poles DIN 45326 Serial Interface: Pin: M12-8 poles. Type: RS232C ( EIA/ TIA574) or USB 1.1 o 2.0 not insulated Baud rate: from 1200 to 38400 baud. with USB baud= 460800 Data bit: 8 Parity: None Stop bit: 1 Flow control: Xon-Xoff Cable length: max 15m Memory divided in 64 blocks. Storage capacity 67600 memorizations for each of the 3 inputs. Logging interval selectable among: 15, 30 seconds, 1, 2, 5, 10, 15, 20, 30 minutes and 1 hour. Description HD32.3 WBGT: Wet Bulb Globe Temperature Meter PMV: Predicted Mean Vote HD32.3 – WBGT - PMV Index is an instrument made by Delta Ohm Srl for: • Analysis of hot environments using WBGT index ( Wet Bulb Glob Temperature: wet bulb temperature and Globe thermometer) in presence or absence of solar radiation. • Analysis of the moderate warm environments using PMV index ( Predicted Mean Vote) and PPD index ( Predicted Percentage of Dissatisfied) . Reference Rules: ISO 7243: Hot environments. Estimation of the heat stress on working man, based on WBGT index ( wet bulb globe Thermometer) . ISO 8996: Ergonomics of the thermal environment. Determination of metabolic rate. ISO 7726: Ergonomics of the thermal environment – Instruments for measuring physical quantities. ISO 7730: Moderate thermal environments. Determination of PMV and PPD index and specification of the condition for thermal comfort. The instrument is provided with three inputs for probes with SICRAM module: the SICRAM module interface between the instrument and sensor connected and communicate the sensor parameters and calibration data to the instrument. All SICRAM probes can be plugged into any of the inputs: they are automatically recognized upon turning on the instrument. The main features of the instrument are: • Logging: data acquisition and logging In the integral instrument memory. Storage capacity: 64 different logging sections, sample interval, user selectable. • Start and stop can be set automatically with the auto-start function, • Selectable measurement unit of the temperature: ° C, ° F, ° K. • Date and time of the instrument. • The display of maximum, minimum, medium statistic parameters and their deletion. • The transfer speed of data via RS232 serial port. HD32.3 instrument can detect simultaneously the following quantities: • Globe thermometer temperature Tg with TP3276.2 probe. • Natural wet bulb temperature Tn with HP3201.2 probe. • Environment temperature T with TP3207.2 probe. • Relative humidity RH and environment temperature T with HP3217.2 probe. • Air speed Va with AP3203.2 probe. Starting from the measured values, HD32.3 can calculate and display, with TP3207.2, HP3276.2, and HP3201.2 probes, the following indexes: • 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. Starting from the measured values, the HD32.3 instrument can calculate and display, with TP3217.2, HP3276.2, and AP3203.2 probes, the following indexes: • Medium radiant temperature Tr. • PMV Index ( Predicted Mean Vote) . • PPD Index ( Predicted Percentage of Dissatisfied) . WBGT WBGT ( Wet Bulb Globe Temperature – wet bulb and globe temperature) 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 measurement of wet bulb temperature tnw with natural ventilation with the globe thermometer temperature tg and, in some situations, with the air temperature ta. The calculation formula is the following: • inside and outside the buildings in absence of solar radiation: WBGTclose environments = 0, 7 tnw + 0, 3 tg • outside the buildings in presence of solar radiation: WBGToutside environments= 0, 7 tnw + 0, 2 tg + 0, 1 ta where: tnw = wet bulb temperature with natural ventilation; 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. • TP3276.2 Globe thermometer probe. • TP3207.2 Dry bulb temperature, of 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 PMV - PPD Human thermal comfort is defined by ASHRAE ( American Society of Heating, Refrigerating and Air Conditioning Engineers INC) as the state of mind that expresses satisfaction with the surrounding living or working environment. The evaluation of this subjective condition can be objectified and quantified using integrated index that consider the micro climatic environment parameters ( Ta, Tr, Va, rh) , and the work-related energy metabolic expenditure MET, and the typology of clothing ( thermal insulation CLO) commonly used. Among these indexes, the most precise one reflecting the influence of the above mentioned physical and physiological variables on thermal comfort is PMV ( Predicted Mean Vote) . Synthetically, it comes from the equation of the thermal balance whose result is compared to a scale of psycho - physical health and expresses the average opinion ( average foreseen vote) about the thermal sensations of a group of subjects. From PMV is derived a second index called PPD ( Predicted Percentage of Dissatisfied) that quantifies the percentage of subjects who will be dissatisfied with some micro climatic conditions. ISO 7730 regulations suggests PMV use in presence of following variables that influence the thermal balance: • Metabolic expenditure = 1 ÷ 4 met • Thermal resistance of clothing = 0 ÷ 2 clo • Dry bulb temperature = 10 ÷ 30° C • Medium radiant temperature = 10 ÷ 40° C • Air speed = 0 ÷ 1 m/ sec • Water vapour pressure = 0 ÷ 2, 7 kpa PMV is a particularly suitable index for the evaluation of work places with moderate microclimate such as houses, schools, offices, research laboratories, hospitals, and is useful to predict the number of people likely to feel uncomfortably warm or cool. According to ISO 7730 PMV values range between + 0, 5 and - 0, 5, provides comfort conditions corresponding to a percentage of dissatisfied ( PPD) lower than 10% . ( see table below) . Average radiant temperature Tr The average radiant temperature is defined as the temperature of thermally uniform simulated environment that would exchange with a man the same thermal radiation power exchanged in the real environment. In order to evaluate the average radiant temperature, it is necessary to measure: the globe thermometer temperature, the air temperature, and the air speed measured close to the globe thermometer. TECHNICAL FEATURES Instrument Dimensions 185x90x40 mm ( Length x Width x Height) Weight 470 g ( batteries included) Materials ABS, rubber Display Back light, dot-matrix 160x160 points, visible area 52x42mm Working Conditions Working temperature -5 … 50° C Storage temperature -25 … 65° C Working relative humidity 0 … 90% RH no condensation Protection Degree IP67 Instrument uncertainty ± 1 digit @ 20° C Power supply Mains power supply ( cod. SWD10) 12Vdc/ 1A Batteries 4 batteries 1.5V type AA Autonomy 200 hours with 1800mAh alkaline batteries Power absorbed with < 45¼ A instrument off Safety of the stored data Unlimited TP3207.2 temperature probe Sensor type: Pt100 with thin film Accuracy: Class 1/ 3 DIN Measurement range: -40 ÷ 100 ° C Resolution: 0.1° C Temperature drift @ 20° C: 0.003% / ° C Drift after 1 year: 0.1° C/ year Connection: 4 wires plus SICRAM module Connector: 8 female poles DIN45326 Dimensions: Ø = 14 mm L= 150 mm Response time T95: 15 minutes TP3276.2 globe thermometer probe Ø = 50 mm Sensor type: Pt100 Accuracy: Class 1/ 3 DIN Measurement range: -10 ÷ 100 ° C Resolution: 0.1° C Temperature drift @ 20° C: 0.003% / ° C Drift after 1 year: 0.1° C/ year Connection: 4 wires plus SICRAM module Connector: 8 female poles DIN45326 Stem dimension: Ø = 8 mm L= 170 mm Response time T95: 15 minutes HP3201.2 Natural wet bulb Sensor type: Pt100 Accuracy: Class A with platinum wire Measurement range: 4 ° C ÷ 80 ° C Resolution: 0.1° C Temperature drift @ 20° C: 0.003% / ° C Drift after 1 year: 0.1° C/ year Connection: 4 wires plus SICRAM Module Connector: 8 female poles DIN45326 Stem dimension: Ø = 14 mm L= 170 mm Braid length: 10 cm. at least Tank capacity: 15 cc. Tank autonomy: 96 hours with RH= 50% , t = 23° C Response time T95: 15 minutes HP3217.2 Combined temperature and relative humidity probe Sensor type: Pt100 with thin film for temperature Capacitive sensor for relative humidity Temperature accuracy: 1/ 3 DIN Relative humidity accuracy: ± 2% RH ( 15 ÷ 90 % RH) @ 20° C ± 2.5% RH remaining range Measuring range: temperature: -10 ° C ÷ 80 ° C relative humidity: 5% ÷ 98% RH Connection: 4 wires plus SICRAM Module Connector: 8 female poles DIN45326 Dimensions: Ø = 14 mm L= 150 mm Response time T95: 15 minutes Resolution: 0.1% RH, 0.1% ° C AP3203.2 Omnidirectional hot wire probe Sensor type: NTC 10kohm Accuracy: ± 0.05 m/ s ( 0÷ 1 m/ s) ± 0.15 m/ s ( 1÷ 5 m/ s) Measuring range: 0÷ 5 m/ s 0 ° C ÷ 80 ° C Connection: 7 wires plus SICRAM Module Connector: 8 female poles DIN45326 Stem dimension: Ø = 8 mm L= 230 mm Protection dimension: Ø = 80 mm Resolution: 0.01 m/ s Temperature drift @ 20° C: 0.06% / ° C Drift after 1 year: 0.12 ° C/ years Connections Input for SICRAM module probes 3 Connectors 8 male poles DIN 45326 Serial interface: Pin: M12-8 poles. Type: RS232C ( EIA/ TIA574) or USB 1.1 o 2.0 no isolated Baud rate: from 1200 to 38400 baud. with USB baud= 460800 Data bit: 8 Parity: None Stop Bit: 1 Flow Control: Xon-Xoff Cable length: max 15m Memory divided in 64 blocks. Storage capacity 67600 memorizations for each of 3 inputs. Logging interval selectable among: 15, 30 seconds, 1, 2, 5, 10, 15, 20, 30 minutes and 1 hour.
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