Campbell BlackGlobe Instruction Manual
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Campbell BlackGlobe Instruction Manual

Temperature sensor for heat stress
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BlackGlobe Temperature
Sensor for Heat Stress
Revision: 9/13
C o p y r i g h t
©
2 0 1 3
C a m p b e l l
S c i e n t i f i c ,
I n c .

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Summary of Contents for Campbell BlackGlobe

  • Page 1 BlackGlobe Temperature Sensor for Heat Stress Revision: 9/13 C o p y r i g h t © 2 0 1 3 C a m p b e l l S c i e n t i f i c ,...
  • Page 3 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.
  • Page 4 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.

  • Page 5: Table Of Contents

    4. Overview ..............2 5. Specifications .............2 Accuracy ....................2 6. Installation ..............4 Siting ....................4 Assembly and Mounting ..............4 6.2.1 Mounting the BlackGlobe on the Mounting Arm ......4 6.2.2 Mounting the BlackGlobe Assembly on a Horizontal Crossarm..................6 7. Operation ..............7 Wiring ....................7 Calculations..................8 7.2.1 Wet-Bulb Globe Thermometer Index (WBGT) ......8...
  • Page 6 Nuts and lock washers on mounting bolt..........5 6-3. BlackGlobe fitting and cable alignment ..........6 6-4. BlackGlobe mounted to a crossarm (front view)......... 7 6-5. BlackGlobe mounted to a crossarm (back view) ......... 7 Tables 5-1. Thermistor Interchangeability Specification ........3 5-2. Polynomial Error ................. 3 7-1.

  • Page 7: Introduction

    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. Initial Inspection •...

  • Page 8: Overview

    BlackGlobe Temperature Sensor for Heat Stress 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.

  • Page 9: Polynomial Error Curve (Edlog Dataloggers Only)

    BlackGlobe Temperature Sensor for Heat Stress TABLE 5-1. Thermistor Interchangeability Specification Temperature Temperature (°C) Tolerance (±°C) −5 0.14 0 to +70 0.10 0.25 0.35 TABLE 5-2. Polynomial Error < ±0.5°C –5° to +95° < ±0.1°C –3° to +90° FIGURE 5-1. Polynomial error curve (Edlog dataloggers only)

  • Page 10: Installation

    FIGURE 5-2. Thermistor interchangeability limits Installation Siting The BlackGlobe must be mounted in a location that will not be shadowed and is representative of the environmental conditions to be measured. Assembly and Mounting Tools required for installing on a tripod or tower: •...

  • Page 11: Mounting Kit Components

    BlackGlobe Temperature Sensor for Heat Stress Mounting Arm Pipe Clamp Slot Nuts Lock Washers Pipe Clamps U-bolt Mounting Bolt FIGURE 6-1. Mounting kit components 1. Place the mounting bolt through the hole in the mounting arm as shown in FIGURE 6-2.

  • Page 12: Mounting The Blackglobe Assembly On A Horizontal Crossarm

    4. Tighten down the nut closest to the mounting arm so the bolt is held firmly in place. 5. Thread the BlackGlobe fitting onto the bolt. Thread it as far down as it will go, but you may have to back it off a bit. The cable gland and cable should align with the mounting arm as shown in FIGURE 6-3.

  • Page 13: Operation

    FIGURE 6-5. BlackGlobe mounted to a crossarm (back view) Operation Wiring The wiring diagram for the BlackGlobe to a Campbell Scientific datalogger is given in TABLE 7-1. Temperature is measured with one single-ended input channel and a voltage excitation channel. Multiple probes can be connected to...

  • Page 14: Calculations

    In the examples shown in Section 7.3, Programming, the HC2S3 is used. Ultimately, WBGT = (0.2 × BlackGlobe Temp) + (0.7 × Wet-Bulb Temp) + (0.1 × Dry- Bulb Temp) Dewpoint and Wet-Bulb temperature units include: °C, °F, °K 7.2.2 Dewpoint...

  • Page 15: Vapor Pressure

    BlackGlobe Temperature Sensor for Heat Stress The equation is an inverse of a version of Teten’s equation (Tetens, 1930), optimized for dewpoints in the range –35° to 50°C, and is accurate to within plus or minus 0.1°C within that range.

  • Page 16: Mean Site Barometric Pressure Calculation (Sp_Kpa)

    Programming 7.3.1 Example CR1000 Program The example includes measurements of the BlackGlobe temperature, and the calculation of wet-bulb temperature and wet-bulb globe temperature. Measurements of air temperature and relative humidity are supplied by an HC2S3 in this example.
  • Page 17 DewPoint (DewPnt_C,AirTempC,AirRH) If (DewPnt_C > AirTempC) Or (DewPnt_C = NAN) Then DewPnt_C = AirTempC UpperTmp = AirTempC LowerTmp = DewPnt_C 'BlackGlobe wired to SE channel 3 and excitation channel VX1. Therm108 (BGTemp_C,1,3,Vx1,0,_60Hz,1.0,0) 'Loop to find wet-bulb temperature. old_wbT = new_wbT...

  • Page 18: Long Lead Lengths

    BlackGlobe Temperature Sensor for Heat Stress Long Lead Lengths If the BlackGlobe has lead lengths greater than 300 feet, a longer settling time before the measurement is made is required. For CRBasic loggers, the 60 and 50 Hz integration options include a 3 ms settling time; longer settling times also can be entered into the Settling Time parameter.

  • Page 19: The Theory Of Blackglobe Temperature And Heat Stress

    Appendix A. The Theory of BlackGlobe Temperature and Heat Stress The Wet-Bulb Globe Temperature Index (WBGT) combines the effects of temperature, humidity, radiant heat, and wind into one single index employed to express environmental heat stress. Loss of physical and mental efficiency occurs under definable degrees of heat stress.
  • Page 20 Appendix A. The Theory of BlackGlobe Temperature and Heat Stress...

  • Page 21: Edlog Programming Examples

    TABLE B-2. The example includes instructions for measuring an HC2S3 to supply air temperature and relative humidity values. Calculations for dewpoint, wet-bulb, and wet-bulb globe temperature are also included. ;{CR10X} ;Program: BLACKGLOBE.CSI ;Date: June 2013 *Table 1 Program 01: 5.0000...
  • Page 22 2: 0 n, Exponent of 10 3: 5 Z Loc [ AirRH 8: End (P95) 9: End (P95) ;BlackGlobe temperature - °C 10: AC Half Bridge (P5) 1: 1 Reps 2: 23 25 mV 60 Hz Rejection Range 3: 3...
  • Page 23 Appendix B. Edlog Programming Examples ;Dewpoint calculation. 15: Z=X*F (P37) 1: 10 X Loc [ VP_kPa ] 2: 1.63725 3: 20 Z Loc [ scratch1 ] 16: Z=LN(X) (P40) 1: 20 X Loc [ scratch1 ] 2: 20 Z Loc [ scratch1 ] 17: Z=X*F (P37) 1: 20 X Loc [ scratch1 ]...
  • Page 24 Appendix B. Edlog Programming Examples 26: Z=X (P31) 1: 7 X Loc [ DewPnt_C ] 2: 15 Z Loc [ LowerTmp ] ;Iterative loop to figure out wet-bulb temperature. 27: Beginning of Loop (P87) 1: 0 Delay 2: 25 Loop Count 28: Z=X (P31) 1: 12 X Loc [ new_wbT ]...
  • Page 25 Appendix B. Edlog Programming Examples 37: Z=X (P31) 1: 12 X Loc [ new_wbT ] 2: 14 Z Loc [ UpperTmp ] 38: Else (P94) 39: Z=X (P31) 1: 12 X Loc [ new_wbT ] 2: 15 Z Loc [ LowerTmp ] 40: End (P95) 41: If (X<=>F) (P89) 1: 16...
  • Page 26 Appendix B. Edlog Programming Examples 49: If time is (P92) 1: 0 Minutes (Seconds --) into a 2: 60 Interval (same units as above) 3: 10 Set Output Flag High (Flag 0) 50: Set Active Storage Area (P80) 1: 1 Final Storage Area 1 2: 101 Array ID...

  • Page 27: B-1. Polynomial Coefficients

    Appendix B. Edlog Programming Examples 62: Maximum (P73) 1: 1 Reps 2: 0 Value Only 3: 2 Loc [ CR10XTmpC ] 63: Minimum (P74) 1: 1 Reps 2: 0 Value Only 3: 2 Loc [ CR10XTmpC ] *Table 2 Program 01: 0 Execution Interval (seconds) *Table 3 Subroutines...
  • Page 28 Appendix B. Edlog Programming Examples TABLE B-2. Actual Temperature, Sensor Resistance, and Computed Temperature Temperature Resistance Output °C OHMS °C 10.00 207807 10.00 12.00 187803 12.04 14.00 169924 14.07 16.00 153923 16.09 18.00 139588 18.10 20.00 126729 20.09 22.00 115179 22.07 24.00 104796...

  • Page 29: Edlog Programming For Long Lead Lengths

    Appendix B. Edlog Programming Examples TABLE B-2. Actual Temperature, Sensor Resistance, and Computed Temperature Temperature Resistance Output °C OHMS °C 74.00 13405 73.98 76.00 12479 75.99 78.00 11625 78.01 80.00 10837 80.02 82.00 10110 82.03 84.00 9438.1 84.04 86.00 8816.9 86.03 88.00 8241.9...
  • Page 30 Appendix B. Edlog Programming Examples 02: Polynomial (P55) 1: 1 Reps 2: 1 X Loc [BGTemp_C ] 3: 1 F(X) Loc [BGTemp_C ] 4: -26.97 5: 69.635 6: -40.66 7: 16.573 8: -3.455 9: .301 B-10...
  • Page 32 Campbell Scientific Ltd. (CSL Germany) Fahrenheitstraße 13 28359 Bremen GERMANY www.campbellsci.de • info@campbellsci.de Campbell Scientific Spain, S. L. (CSL Spain) Avda. Pompeu Fabra 7-9, local 1 08024 Barcelona SPAIN www.campbellsci.es • info@campbellsci.es Please visit www.campbellsci.com to obtain contact information for your local US or international representative.

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