CALIBRATION CORRECTION CHART READING CORRECTION READING fpm CORRECTION
CALIBRATION CORRECTION CHART READING CORRECTION READING (fpm) CORRECTION 50 + 15 500 -5 75 + 15 550 -8 100 + 14 600 - 10 125 + 14 700 - 15 150 + 14 800 - 20 175 + 13 900 - 25 200 + 12 1000 - 30 250 + 11 1200 - 35 300 + 10 1400 - 45 350 +5 1600 - 50 400 0 1800 - 60 450 -2 2000 - 65
CALIBRATION CORRECTION CHART READING CORRECTION READING (fpm) 50 75 100 125 150 175 200 250 300 350 400 450 + 15 + 14 + 13 + 12 + 11 + 10 +5 0 -2 500 550 600 700 800 900 1000 1200 1400 1600 1800 2000 CORRECTION -5 -8 - 10 - 15 - 20 - 25 - 30 - 35 - 45 - 50 - 65 Air Velocity = Reading + Correction R 1 = 600 C 1 = - 10 C 2 = - 15 R 2 = 700 R = reading on anemometer R = 620 fpm Interpolation Formula C= C= (C 2 - C 1) (R 2 - R 1) x (R - R 1 ) + C ((-15) - (-10)) (700 - 600) 1 x (620 - 600) + (-10) = -11 fpm Air Velocity = 620 fpm + (- 11 fpm) = 609 fpm
Medium Velocity Air Measurements (anemometers) CALIBRATION CORRECTION CHART READING CORRECTION READING (fpm) 50 75 100 125 150 175 200 250 300 350 400 450 + 15 + 14 + 13 + 12 + 11 + 10 +5 0 -2 500 550 600 700 800 900 1000 1200 1400 1600 1800 2000 CORRECTION -5 -8 - 10 - 15 - 20 - 25 - 30 - 35 - 45 - 50 - 65 R = reading on anemometer R = 380 fpm C= (R 2 - R 1 ) x (R - R 1 ) + C 5. 8’ 18. 7’ The dimensions of the mine entry were measured. Interpolation Formula (C 2 - C 1) 6. 2’ Average H = 1 Air Velocity = Reading + Correction H 1+ H 2+ H 3 A=Wx. H q=Vx. A 3
Medium Velocity Air Measurements (anemometers) CALIBRATION CORRECTION CHART READING CORRECTION READING (fpm) 50 75 100 125 150 175 200 250 300 350 400 450 + 15 + 14 + 13 + 12 + 11 + 10 +5 0 -2 500 550 600 700 800 900 1000 1200 1400 1600 1800 2000 CORRECTION -5 -8 - 10 - 15 - 20 - 25 - 30 - 35 - 45 - 50 - 65 Interpolation Formula C= (C 2 - C 1) (R 2 - R 1) R = reading on anemometer R = 380 fpm R 1 = 350 C 1 = + 5 C 2 = 0 R 2 = 400 x (R - R 1 ) + C 1 6. 2’ 5. 8’ 18. 7’ Average H = H 1 + H 2 + H 3 3 6. 2’+5. 8’ = 5. 9’ Average H = 3 A = W x H = 18. 7’ x 5. 9’ = 110 sq. ft. q=Vx. A ((0) - (+ 5)) q = 382 fpm x 110 sq. ft. x (380 350) + (+ 5) = + 2 fpm C= (400 - 350) q = 42, 020 cfm Air Velocity = 380 fpm + (+ 2 fpm) = 382 fpm
Medium Velocity Air Measurements (anemometers) CALIBRATION CORRECTION CHART READING CORRECTION READING (fpm) 50 75 100 125 150 175 200 250 300 350 400 450 + 15 + 14 + 13 + 12 + 11 + 10 +5 0 -2 500 550 600 700 800 900 1000 1200 1400 1600 1800 2000 CORRECTION -5 -8 - 10 - 15 - 20 - 25 - 30 - 35 - 45 - 50 - 65 R = reading on anemometer R = 310 fpm C= (R 2 - R 1) x (R - R 1 ) + C 3. 4’ 3. 3’ 20. 2’ The dimensions of the mine entry were measured. Interpolation Formula (C 2 - C 1) 3. 5’ Average H = 1 Air Velocity = Reading + Correction H 1 + H 2 + H 3 A=Wx. H q=Vx. A 3
Medium Velocity Air Measurements (anemometers) CALIBRATION CORRECTION CHART READING CORRECTION READING (fpm) 50 75 100 125 150 175 200 250 300 350 400 450 + 15 + 14 + 13 + 12 + 11 + 10 +5 0 -2 500 550 600 700 800 900 1000 1200 1400 1600 1800 2000 CORRECTION -5 -8 - 10 - 15 - 20 - 25 - 30 - 35 - 45 - 50 - 65 R = reading on anemometer R = 310 fpm 3. 5’ C 2 = + 5 R 2 = 350 3. 3’ 20. 2’ R 1 = 300 C 1 = + 10 3. 4’ Average H = H 1 + H 2 + H 3 3 3. 5’+3. 4’+3. 3’ = 3. 4’ Average H = 3 A = W x H = 20. 2’ x 3. 4’ = 69 sq. ft. Interpolation Formula (C 2 - C 1) x (R - R 1 ) + C 1 C= (R 2 - R 1) ((+ 5) - (+ 10)) x (310 - 300) + (+ 10) C= (350 - 300) q=Vx. 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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