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| Microtherm Heat Stress monitor.Workers exposed to hot working environments can be susceptible to heat stress |
Workers exposed to hot working environments can be susceptible to heat stress, when the core body temperature rises to dangerous or hazardous levels. This can result in physiological symptoms like heat cramps, nausea, palpitations, stroke and possibly death. An overall estimation of the heat stress levels on a body can be measured using the Wet Bulb Globe Temperature (WBGT) Index. This combines the results from three temperature sensors into a single calculated value that may be compared with reference values depending upon the specific work regime. The WBGT meter measures simultaneously from three PRTD sensors for wet bulb (tnw), dry bulb (ta) and globe (tg) temperatures. Sensors are manufactured to high accuracy standards: BS 1904 and DIN 43760. The sensors can be mounted directly onto the body of the instrument or they can be remotely positioned via a 30 ft cable. Both meter and sensor unit have a tripod socket for ease of use. WBGT values are calculated simultaneously according to the following formulae for indoors and outdoors. WBGT(in) = 0.7tnw + 0.3tg or WBGT(out) = 0.7tnw + 0.2tg + 0.1ta Processed data values include: WBGT(indoors), WBGT(outdoors), 1 hour (TWA) WBGT values, Relative humidity (%), Dewpoint temperature.
Logged values include date and time plus all measured and computed values. Data Logging intervals from 30 seconds to 1 hour. Results are stored in either °F or °.C. |
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Features |
- Large LCD screen; Real time display of changing levels; Data-logging as standard
- Low water level alarm; Audible & visual warning of level excedances
- RH% and dewpoint calculation
- Windows PC software for setup and download of results from memory
- Automatic calculation of work/rest regimes with included PC software
- Tripod mounting for extended surveys
- Meets the requirements of ISO 7243
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Applications |
- Construction / Power stations / Foundries / Steel works / Bakeries / Glass manufacturing / Routine monitoring / Medical surveillance testing
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| | | SPECIFICATIONS
| Measurement |
| Sensing technique |
Platinum resistance temperature detectors (PRTD)
100 elements 0.1% using 4 wire cable up to 30 ft (10m) |
| Ta, Dry bulb, air |
Measuring range: 50 - 140 °F (10 - 60 °C), accuracy ± 2.0 °F (1.0 °C) |
| Tg, Globe |
Measuring range: 68 - 248 °F (20 - 120 °C), accuracy ± 2.0 °F (1.0 °C) |
| Tnw, Natural wet |
Measuring range: 41 - 104 °F (5 - 40 °C), accuracy ± 1.0 °F (0.5 °C) |
| Resolution: |
0.1% for temperature and relative humidity |
| Power supply |
| Battery pack |
4 x AA MN1500 cells, Alkaline or rechargeable NiCad |
| Battery life |
20 hours NiCad cells or 85 hours Alkaline cells |
| External supply |
100 - 240 VAC Universal transformer with intelligent internal NiCad fast charger circuitry |
| Physical |
| Display |
128 x 64 pixel LCD graphics screen with backlight |
| Keypad |
7 key tactile membrane |
| Weight |
26.5 oz (750 gm) instrument only |
| Dimensions |
10.0 x 3.7 x 2.0 in (245 x 95 50 mm) |
| Displayed and stored values |
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Wet Bulb Globe Temperature Indoors & Outdoors
Wet Bulb Globe Temperature Indoors & Outdoors TWA
Ta, dry bulb, air; Tg, globe; Tnw, natural wet; Dewpoint
Relative humidity % |
| Additional stored values |
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WBGT Indoor & Outdoor max, min and average values
WBGT Indoor & Outdoor TWA maximum, minimum values
Ta, dry bulb, air maximum, minimum and average values
Tg, globe maximum, minimum values
Tnw, natural wet maximum, minimum and average values |
| Data logger |
| Internal memory |
512kb memory providing up to 49,100 data records |
| Logging interval |
30, 60 sec, 1, 2, 3, 4, 5, 6, 10, 15, 20, 30, 60 minutes |
| Recording method |
Record and stop when memory full or overwrite oldest results |
| Analog output |
0 - 2.5 V DC FSD, 500ø output impedance |
| PC Software |
| Operating system |
MS Windows 95/98, NT, 2000 compatible 32 bit package
RS232 serial port, 8 Mb RAM, FDD & HDD, VGA graphics card |
| CAT NO. |
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MODEL |
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DEscRIPTION |
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AVAIL |
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PRICE |
| CEL180000 |
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180000A |
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Microtherm Heat Stress monitor with std access in customized case |
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Yes |
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5,400,000
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| CEL180042 |
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180042A |
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Microtherm Heat Stress monitor with std access in customized case plus individual calibration certificate |
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Yes |
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5,778,000
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| CEL180043 |
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180043A |
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30 ft (10m) extention cable |
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Yes |
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378,000 |
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