VI. CORRECTIONS TO VOLUMETRIC FLOW
Changes in altitude and temperature can cause changes in air density,
thus affecting the output of the CAL-101. The output of the CAL-101 was
calibrated to STP (standard temperature and pressure) of sea level and
20°C. To compensate for differences in altitude or temperature from STP,
the following tables should be utilized:
Note: Altitude and Temperature are cumulative, i.e., you must correct
for both factors to obtain the most accurate calibration.
Altitude Correction Table
Temperature Correction Table
Altitude
Corrected Out-
put (multiply by)
Temperature
(°C)
Corrected (multiply by)
0
1.000
-30
0.829
1000
1.038
-20
0.863
2000
1.076
-10
0.898
3000
1.116
0
0.932
4000
1.158
10
0.966
5000
1.202
20
1.000
6000
1.248
30
1.034
40
1.068
50
1.102
Example:
At 3200 feet with a temperature of 29°C. The corrected volumetric flow
rate is
.5 LPM x 1.116 x 1.034 = .577 LPM (volumetric)
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