Data Sheet

ManualsBrandsDelta Ohm ManualsEnvironmental Testing EquipmentDelta Ohm HD32.2 WBGT Kit Thermometer -40 up to +100 °C

CP23

HD2110/RS

SWD10

VTRAP30

HD32.2, HD32.2A, WBGT Index

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 thermom-

eter 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 com-

municate the sensor parameters and calibration data to the instrument.

The instrument is equipped with three inputs for probes with SICRAM module: the

probes have an electronic circuit that communicates with the instrument and stores

the sensor calibration data. All SICRAM probes can be connected to any of the instru-

ment’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 speciﬁ c work

activity, that causes a thermal stress when exceeded.

WBGT index combines the temperature measurement of wet bulb with natural ven-

tilation t

with the globe thermometer t

and, in some situations, with the air tem-

perature t

The calculation formula is the following:

• inside and outside a buildings in absence of solar radiation:

WBGT

close environments

= 0,7 t

+ 0,3 t

• outside a building in presence of solar radiation:

WBGT

outside environments

= 0,7 t

+ 0,2 t

+ 0,1 t

where:

= natural wet bulb;

= globe thermometer temperature;

= air temperature.

The measured data should be compared with the limit values prescribed by the regu-

lations;

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 regula-

tions:

• 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

HD 32.2, HD32.2A

INSTRUMENT FOR THE ANALYSIS OF THE WBGT INDEX

Summary of content (4 pages)

PAGE 1
HD32.2, HD32.2A, WBGT Index , 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.
PAGE 2
Working conditions Working temperature Storage temperature Working relative humidity -5 … 50°C -25 … 65°C 0 … 90% RH no condensation Protection Degree IP65 Instrument uncertainty ± 1 digit @ 20°C Power supply Batteries Autonomy Power absorbed with instrument off Mains power supply (code SWD10) 12Vdc/1A 4 batteries 1.5V type AA 200 hours with 1800mAh alkaline batteries < 45µA Safety of the stored data unlimited TP3276.2 HP3201.2 TP3207.2 TP3207.
PAGE 3
TP3276.2 Globe thermometer probe Ø=50 mm (Ø=150mm TP3275) 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 (HP3201) Natural ventilation wet bulb Sensor type: Pt100 Accuracy: Class A Measurement range: 4 °C ÷ 80 °C Resolution: 0.
PAGE 4
Probes for HD32.2 WBGT Index (without cable): TP3207.2: Temperature probe with Pt100 sensor. Probe stem Ø 14mm, length 150 mm. Equipped with SICRAM module. TP3276.2: Globe thermometer probe with Pt100 sensor, globe Ø 50 mm. Stem Ø 8 mm, length 170 mm. Equipped with SICRAM module. HP3201.2: Natural wet bulb. Pt100 sensor. Probe stem Ø 14 mm, length 170 mm. Equipped with SICRAM module, spare parts of the braid and case of 50cc. distilled water. HP3201 TP3207 Probes for HD32.