Ohio Lumex Volume Correction Calculators

Rotameter
Dry Gas Calculator
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Dry Gas Calculator

Pressure - when sampling please use a barometer to measure atmospheric pressure in the environment. Record pressure at the beginning and the end of the sample run, then calculate the average. NOTE: The barometric pressure reading may be obtained from a nearby National Weather Service station. If the station value is given as an absolute pressure, an adjustment for the elevation difference between the Station and sampling point has a rate of -0.1 “Hg per 100’ increase or +0.1 “Hg per 100’ for decrease. If the station value is given as a relative pressure (corrected to sea level), use the correction factors above, taking the difference between sea level and the elevation of the sampling point. Temperature – While sampling, measure the temperature of the dry gas meter (DGM) at the beginning and the end of the sample run. Use the included thermocouple connection (Ohio Lumex Systems). Record these values below and calculate the average.

Corrected Volume:
L
Reset
Pressure
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Final Pressure:
Initial Pressure:
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Avg. atm Pressure:
Hg
Pressure
Average Temperature:
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Final Temperature:
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Initial Temperature:
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Calibration Factor
Volumes
Final Volume:
L
Measured Volume
L
Final Volume:
L

The Corrected Volume is calculated only after all other measurements have been inputted

Rotameter Calculator

Pressure - While sampling, you must use a barometer to measure atmospheric pressure in the environment where you are sampling. Record pressure at the beginning and the end of the sample run, then calculate the average. NOTE: The barometric pressure reading may be obtained from a nearby National Weather Service station. If the station value is given as an absolute pressure, an adjustment for the elevation difference between the Station and sampling point has a rate of -0.1 “Hg per 100’ increase or +0.1 “Hg per 100’ for decrease. If the station value is given as a relative pressure (corrected to sea level), use the correction factors above, taking the difference between sea level and the elevation of the sampling point. Temperature – While sampling, measure the temperature of the dry gas meter (DGM) at the beginning and the end of the sample run. Use the included thermocouple connection (Ohio Lumex Systems). Record these values below and calculate the average.

Corrected Volume:
L
Reset
Pressure
arrow&v
Final atm Pressure:
Initial atm  Pressure:
arrow&v
Average atm Pressure:
Hg
Temperature
Average DGM Temperature:
arrow&v
Final Ambient Temperature:
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Initial Ambien Temperature:
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Measured Flow Rate
Volume
Sampling Period
Min
Correction Factor
Methane Concentration
%
Lpm

The Corrected Volume is calculated only after all other measurements have been inputted