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CALIBRATION CORRECTION CHART

CALIBRATION CORRECTION CHART. READING (fpm). CORRECTION. READING (fpm). CORRECTION. 500. 50. + 15. - 5. 550. 75. + 15. - 8. 600. 100. + 14. - 10. 700. 125. + 14. - 15. 800. 150. + 14. - 20. 900. 175. - 25. + 13. 1000. 200. + 12. - 30. 250. - 35. + 11. 1200.

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CALIBRATION CORRECTION CHART

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  1. CALIBRATION CORRECTION CHART READING (fpm) CORRECTION READING (fpm) CORRECTION 500 50 + 15 - 5 550 75 + 15 - 8 600 100 + 14 - 10 700 125 + 14 - 15 800 150 + 14 - 20 900 175 - 25 + 13 1000 200 + 12 - 30 250 - 35 + 11 1200 1400 300 - 45 + 10 1600 350 + 5 - 50 1800 400 0 - 60 2000 450 - 2 - 65

  2. CALIBRATION CORRECTION CHART Air Velocity = Reading + Correction READING (fpm) CORRECTION READING (fpm) CORRECTION 50 + 15 500 - 5 R = 600 R = reading on anemometer R = 620 fpm 75 + 15 550 - 8 1 - 10 100 600 + 14 C =- 10 1 700 125 - 15 + 14 C=- 15 800 150 + 14 - 20 2 + 13 900 175 - 25 R = 700 2 1000 200 - 30 + 12 1200 250 - 35 + 11 Interpolation Formula 1400 - 45 + 10 300 350 1600 - 50 + 5 400 1800 0 - 60 (C-C) 2000 450 - 65 - 2 2 1 C = x (R - R ) + C 1 1 (R - R ) 2 1 ((-15)-(-10)) C = x (620 - 600) + (-10) = -11 fpm (700 - 600) Air Velocity = 620 fpm +(- 11 fpm) = 609 fpm

  3. Medium Velocity Air Measurements (anemometers) 6.2’ 5.8’ 5.8’ 18.7’ The dimensions of the mine entry were measured. H + H + H 1 2 3 Average H = 3 (C-C) 2 1 C = x (R - R ) + C A = W x H 1 1 (R - R ) 2 1 CALIBRATION CORRECTION CHART R = reading on anemometer R = 380 fpm READING (fpm) CORRECTION READING (fpm) CORRECTION 50 + 15 500 - 5 75 + 15 550 - 8 - 10 100 600 + 14 700 125 - 15 + 14 800 150 + 14 - 20 + 13 900 175 - 25 1000 200 - 30 + 12 250 - 35 1200 + 11 1400 - 45 + 10 300 350 1600 - 50 + 5 400 1800 0 - 60 2000 450 - 65 - 2 Interpolation Formula Air Velocity = Reading + Correction q = V x A

  4. Medium Velocity Air Measurements (anemometers) H + H + H 1 2 3 Average H = 3 6.2’+5.8’+5.8’ Average H = 3 (C-C) 2 1 C = x (R - R ) + C 1 1 (R - R ) 2 1 CALIBRATION CORRECTION CHART R = reading on anemometer R = 380 fpm READING (fpm) CORRECTION READING (fpm) CORRECTION 6.2’ 5.8’ 5.8’ 50 + 15 500 - 5 75 + 15 550 - 8 18.7’ - 10 100 600 + 14 700 125 - 15 + 14 800 150 + 14 - 20 + 13 900 175 - 25 R = 350 1000 200 - 30 1 + 12 1200 250 - 35 + 11 C =+ 5 1400 - 45 + 10 300 1 350 1600 - 50 + 5 C=0 400 1800 0 - 60 2 = 5.9’ 2000 450 - 65 - 2 R = 400 2 Interpolation Formula A = W x H =18.7’ x 5.9’ = 110 sq.ft. q = V x A q = 382 fpm x 110 sq.ft. ((0)-(+ 5)) C = x (380 - 350) + (+ 5) = + 2 fpm q = 42,020 cfm (400 - 350) Air Velocity = 380 fpm +(+ 2 fpm) = 382 fpm

  5. Medium Velocity Air Measurements (anemometers) 3.5’ 3.4’ 3.3’ 20.2’ The dimensions of the mine entry were measured. H + H + H 1 2 3 Average H = 3 (C-C) 2 1 C = x (R - R ) + C A = W x H 1 1 (R - R ) 2 1 CALIBRATION CORRECTION CHART R = reading on anemometer R = 310 fpm READING (fpm) CORRECTION READING (fpm) CORRECTION 50 + 15 500 - 5 75 + 15 550 - 8 - 10 100 600 + 14 700 125 - 15 + 14 800 150 + 14 - 20 + 13 900 175 - 25 1000 200 - 30 + 12 1200 250 - 35 + 11 1400 - 45 + 10 300 350 1600 - 50 + 5 400 1800 0 - 60 2000 450 - 65 - 2 Interpolation Formula Air Velocity = Reading + Correction q = V x A

  6. Medium Velocity Air Measurements (anemometers) H + H + H 1 2 3 Average H = 3 3.5’+3.4’+3.3’ Average H = 3 (C-C) 2 1 C = x (R - R ) + C 1 1 (R - R ) 2 1 ((+ 5)-(+ 10)) C = x (310 - 300) + (+ 10) (350 - 300) CALIBRATION CORRECTION CHART R = reading on anemometer R = 310 fpm READING (fpm) CORRECTION READING (fpm) CORRECTION 3.5’ 3.4’ 3.3’ 50 + 15 500 - 5 75 + 15 550 - 8 20.2’ - 10 100 600 + 14 700 125 - 15 + 14 800 150 + 14 - 20 R = 300 + 13 900 175 - 25 1 1000 200 - 30 + 12 C =+ 10 1200 250 - 35 + 11 1 300 + 10 1400 - 45 C=+ 5 350 1600 - 50 + 5 2 400 1800 0 - 60 R = 350 = 3.4’ 2 2000 450 - 65 - 2 Interpolation Formula A = W x H =20.2’ x 3.4’ = 69 sq.ft. q = V x A q = 319 fpm x 69 sq.ft. q = 22,011 cfm C = + 9 fpm Air Velocity = 310 fpm +(+ 9 fpm) = 319 fpm

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