DPM TT 570 A, Operating Manual

Page: 13 / 16

CONVERSION TABLES
TT Series LR Manual
Page 11
Pressure:
Pa mbar mmH
2
O inH
2
O mmHg inHg PSI
Pa 1 100.0 9.806 249.1 133.3 3385 6892
mbar 0.010 1 0.098 2.491 1.333 33.85 68.92
mmH
2
O 0.102 10.20 1 25.40 13.60 345.42 702.8
inH
2
O 0.004 0.402 0.039 1 0.535 13.51 27.67
mmHg 7.501 x 10
‐ 3
0.750 0.074 1.868 1 25.64 51.70
inHg 2.953 x 10
‐ 4
0.029 2.895 x 10
‐ 3
0.074 0.039 1 2.305
PSI 1.451 x 10
‐ 4
0.014 1.423 x 10
‐ 3
0.036 0.019 0.4338 1
Volume:
m
3
/sec m
3
/hr l/sec cfm
m
3
/sec 1 0.0002 0.001 0.0004
m
3
/hr 3600 1 3.6 1.699
l/sec 999.97 0.2777 1 0.4719
cfm 2118.88 0.5885 2.1189 1
Velocity:
m/sec ft/min
m/sec 1 0.005
ft/min 196.85 1
Air Velocity Calculations using S.I Scales:
For non ‐ standard air conditions: V = 1.291 x PT 1013.25 x T x Pv
V = Velocity in m/sec B 293
PT = Pitot Tube Factor (for Ellipsoidal type 1.000)
B = Barometric pressure in mbar
T = Absolute temperature in °K (= t in °C + 273 where t = airstream temperature)
Pv = Velocity pressure in Pa
Air Velocity Calculations using Imperial Scales:
For non ‐ standard air conditions: V = 4006 x PT 30 x T x Pv
V = Velocity in ft/min B 528
PT = Pitot Tube Factor (for Ellipsoidal type 1.000)
B = Barometric pressure in inHg
T = Absolute temperature in °R (= t in °F + 460 where t = airstream temperature)
Pv = Velocity pressure in wg