“PRODUCTS MANUFACTURED BY CAMPBELL SCIENTIFIC, INC. are
warranted by Campbell Scientific, Inc. (“Campbell”) to be free from defects in
materials and workmanship under normal use and service for twelve (12)
months from date of shipment unless otherwise specified in the corresponding
Campbell pricelist or product manual. Products not manufactured, but that are
re-sold by Campbell, are warranted only to the limits extended by the original
manufacturer. Batteries, fine-wire thermocouples, desiccant, and other
consumables have no warranty. Campbell’s obligation under this warranty is
limited to repairing or replacing (at Campbell’s option) defective products,
which shall be the sole and exclusive remedy under this warranty. The
customer shall assume all costs of removing, reinstalling, and shipping
defective products to Campbell. Campbell will return such products by surface
carrier prepaid within the continental United States of America. To all other
locations, Campbell will return such products best way CIP (Port of Entry)
INCOTERM® 2010, prepaid. This warranty shall not apply to any products
which have been subjected to modification, misuse, neglect, improper service,
accidents of nature, or shipping damage. This warranty is in lieu of all other
warranties, expressed or implied. The warranty for installation services
performed by Campbell such as programming to customer specifications,
electrical connections to products manufactured by Campbell, and product
specific training, is part of Campbell’s product warranty. CAMPBELL
EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. Campbell is not liable for any special, indirect,
incidental, and/or consequential damages.”
Assistance
Products may not be returned without prior authorization. The following
contact information is for US and international customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company serves
your country.
To obtain a Returned Materials Authorization (RMA), contact CAMPBELL
SCIENTIFIC, INC., phone (435) 227-9000. After an applications engineer
determines the nature of the problem, an RMA number will be issued. Please
write this number clearly on the outside of the shipping container. Campbell
Scientific’s shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
For all returns, the customer must fill out a “Statement of Product Cleanliness
and Decontamination” form and comply with the requirements specified in it.
The form is available from our web site at www.campbellsci.com/repair. A
completed form must be either emailed to repair@campbellsci.com or faxed to
(435) 227-9106. Campbell Scientific is unable to process any returns until we
receive this form. If the form is not received within three days of product
receipt or is incomplete, the product will be returned to the customer at the
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products that were exposed to contaminants that may cause health or safety
concerns for our employees.
Table of Contents
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The BlackGlobe Temperature Sensor for Heat Stress (BlackGlobe) measure
radiant temperature. This measurement, along with the measurement of
ambient air and wet-bulb temperatures, is used to calculate the wet-bulb globe
temperature (WBGT). The WBGT index combines the effects of temperature,
humidity, radiant heat, and wind into one single index employed to express
environmental heat stress. The measurement of heat stress is important
because loss of physical and mental efficiency occurs under definable degrees
of heat stress. Severe heat stress can lead to fatigue, exhaustion and possibly
even disability or death.
Before installing the BlackGlobe, please study
• Section 2, Cautionary Statements
• Section 3, Initial Inspection
2. Cautionary Statements
• The BlackGlobe is a precision instrument. Please handle it with care.
• The black outer jacket of the cable is Santoprene® rubber. This
compound was chosen for its resistance to temperature extremes, moisture,
and UV degradation. However, this jacket will support combustion in air.
It is rated as slow burning when tested according to U.L. 94 H.B. and will
pass FMVSS302. Local fire codes may preclude its use inside buildings.
•Do not use the BlackGlobe with long lead lengths in an electrically noisy
environment.
3. Initial Inspection
•Upon receipt of the BlackGlobe, inspect the packaging and contents for
damage. File damage claims with the shipping company. Immediately
check package contents against the shipping documentation (see Section
3.1, Ships With List). Contact Campbell Scientific about any
discrepancies.
•The model number and cable length are printed on a label at the
connection end of the cable. Check this information against the shipping
documents to ensure the expected product and cable length are received.
3.1 Ships With List
• (4) 7362 8 inch Wire Ties
• (1) 29956 BlackGlobe Mounting Kit
• ResourceDVD
1
BlackGlobe Temperature Sensor for Heat Stress
4. Overview
The BlackGlobe uses a thermistor inside a 15.24 cm (6 in) hollow copper
sphere, painted black to measure radiant temperature. This measurement along
with the measurement of ambient air and wet-bulb temperatures may be used to
calculate the WBGT index, which is sometimes referred to as the Humidex.
Sensor cable length is specified at the time of order. Do not exceed 1000 feet
of cable.
To calculate the wet-bulb globe thermometer index (WBGT), the measurement
of the BlackGlobe (radiant heat), wet-bulb (evaporative heat), and ambient air
(dry-bulb) temperatures are required. The wet-bulb temperature can be
calculated using air temperature and relative humidity if a wet-bulb
thermometer is not available. See Section 7.2, Calculations.
5. Specifications
Temperature Measurement Range: –5° to +95°C
Temperature Survival Range: –50° to +100°C
NOTE
5.1 Accuracy
Thermistor Interchangeability Error: Typically < ±0.2°C over 0°C to 70°C
and ±0.3 at 95°C
Polynomial Linearization Error: < ±0.5°C over –7°C to +90°C
Near Normal Emittance: 0.957
Maximum Cable Length: 305 m (1000 ft)
The black outer jacket of the cable is Santoprene
compound was chosen for its resistance to temperature extremes,
moisture, and UV degradation. However, this jacket will support
combustion in air. It is rated as slow burning when tested
according to V.L. 94 H.B. and will pass FMVSS302. Local fire
codes may preclude its use inside buildings.
The overall probe accuracy is a combination of the thermistor’s
interchangeability specification, the precision of the bridge resistors, and the
Steinhart-Hart equation error (CRBasic dataloggers) or the polynomial error
(Edlog dataloggers). In a worst case, all errors add to an accuracy of ±0.3°C
over the range of –3° to 90°C and ±0.7°C over the range of –5° to 95°C. The
major error component is the interchangeability specification of the thermistor,
tabulated in TABLE 5-1 and plotted in FIGURE 5-2. For the range of 0° to
50°C, the interchangeability error is predominantly offset and can be
determined with a single point calibration. Compensation can then be done
with an offset entered in the measurement instruction. The bridge resistors are
0.1% tolerance with a 10 ppm temperature coefficient. Polynomial errors are
tabulated in TABLE 5-2 and plotted in FIGURE 5-1.