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Campbell BlackGlobe Instruction Manual

Summary of 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 , i n c ..

  • Page 3: Warranty

    Warranty “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...

  • Page 4: Assistance

    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...

  • Page 5: Table of Contents

    Table of contents pdf viewers: these page numbers refer to the printed version of this document. Use the pdf reader bookmarks tab for links to specific sections. 1. Introduction.................................................................1 2. Cautionary statements...................................

  • Page 6

    Table of contents ii appendices a. The theory of blackglobe temperature and heat stress ............................................................A-1 b. Edlog programming examples ..............................B-1 b.1 example cr10x program..............................................................

  • Page 7: Heat Stress

    Blackglobe temperature sensor for heat stress 1. Introduction 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)....

  • Page 8: 4.  Overview

    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 wb...

  • Page 9

    Blackglobe temperature sensor for heat stress table 5-1. Thermistor interchangeability specification temperature ( °c) temperature tolerance ( ±°c) −5 0.14 0 to +70 0.10 +85 0.25 +95 0.35 table 5-2. Polynomial error –5 ° to +95° ±0.5°c –3 ° to +90° ±0.1°c figure 5-1. Polynomial error curve (edlog da...

  • Page 10: 6.  Installation

    Blackglobe temperature sensor for heat stress thermistor interchangeability limits t error _therm_pos t error _therm_neg 0 t 0.3 0.25 0.2 0.15 0.1 0.05 -0.05 -0.1 -0.15 -0.2 -0.25 -0.3 -5 10 25 40 55 70 85 100 figure 5-2. Thermistor interchangeability limits 6. Installation 6.1 siting the blackglobe...

  • Page 11

    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. 2. Slide one of the lock washers against the mount...

  • Page 12

    Blackglobe temperature sensor for heat stress 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 wi...

  • Page 13: 7.  Operation

    Blackglobe temperature sensor for heat stress figure 6-4. Blackglobe mounted to a crossarm (front view) figure 6-5. Blackglobe mounted to a crossarm (back view) 7. Operation 7.1 wiring the wiring diagram for the blackglobe to a campbell scientific datalogger is given in table 7-1. Temperature is mea...

  • Page 14

    Blackglobe temperature sensor for heat stress table 7-1. Wiring diagram for campbell scientific dataloggers color description cr800 cr850 cr5000 cr3000 cr1000 cr9000(x) cr510 cr500 cr10(x) 21x cr7 cr23x black voltage excitation switched voltage excitation switched excitation switched excitation red ...

  • Page 15

    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. 7.2.3 vapor pressure vapor pressure is calculated by the datal...

  • Page 16

    Blackglobe temperature sensor for heat stress 7.2.6 mean site barometric pressure calculation (sp_kpa) the wet-bulb instruction needs mean barometric pressure which is closely related to elevation of the site. U.S. Standard atmosphere and dry air were assumed when equation 6 was derived (wallace & h...

  • Page 17

    Blackglobe temperature sensor for heat stress dim uppertmp dim lowertmp dim old_wbt, new_wbt dim wb_vp_kpa, diff_vp_kpa dim diff_wbt 'define data tables 'hourly data table. Datatable (hourly,1,-1) datainterval (0,1,hr,10) average (1,airtempc,fp2,false) sample (1,airrh,fp2) average (1,dewpnt_c,fp2,fa...

  • Page 18: 8.  Maintenance

    Blackglobe temperature sensor for heat stress 7.4 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 tim...

  • Page 19: 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 ...

  • Page 20

    Appendix a. The theory of blackglobe temperature and heat stress a-2.

  • Page 21: Examples

    Appendix b. Edlog programming examples b.1 example cr10x program instruction 5 (ac half bridge) is used to measure the thermistor probe inside the sphere. Instruction 55 (polynomial) is used to calculate the temperature in degrees celsius. The polynomial coefficients are shown in table b-1. Thermist...

  • Page 22

    Appendix b. Edlog programming examples 6: if (xf) (p89) 1: 5 x loc [ airrh ] 2: 4 3: 108 f 4: 30 then do 7: z=f x 10^n (p30) 1: 100 f 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...

  • Page 23

    Appendix b. Edlog programming examples ;dewpoint calculation. 15: z=x*f (p37) 1: 10 x loc [ vp_kpa ] 2: 1.63725 f 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 ] 2: 241.88 f 3: 21 z loc [ scratch2 ] 18: z=f x 10^n ...

  • 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 ] 2: 11 z loc [ old_wbt ] 29: z=x-y (p35) 1: 14 x loc ...

  • 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 (xf) (p89) 1: 16 x loc [ diff_wbt ] 2: 4 3: 0.01 f 4: 31 exit loop if true 42: end (p95) ;wet-bulb ...

  • 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 51: real time (p77) 1: 1220 year,day,hour/minute (midnight...

  • Page 27

    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 end program table b-1. Polynomial coefficients coeffic...

  • Page 28

    Appendix b. Edlog programming examples table b-2. Actual temperature, sensor resistance, and computed temperature temperature °c resistance ohms output °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

    Appendix b. Edlog programming examples table b-2. Actual temperature, sensor resistance, and computed temperature temperature °c resistance ohms output °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 88.0...

  • Page 30

    Appendix b. Edlog programming examples b-10 02: polynomial (p55) 1: 1 reps 2: 1 x loc [bgtemp_c ] ; 3: 1 f(x) loc [bgtemp_c ] 4: -26.97 c0 5: 69.635 c1 6: -40.66 c2 7: 16.573 c3 8: -3.455 c4 9: .301 c5.

  • Page 32

    Campbell scientific companies campbell scientific, inc. (csi) 815 west 1800 north logan, utah 84321 united states www.Campbellsci.Com • info@campbellsci.Com campbell scientific africa pty. Ltd. (csaf) po box 2450 somerset west 7129 south africa www.Csafrica.Co.Za • cleroux@csafrica.Co.Za campbell sc...