4. Calibrating GreenFeed
4.1. Standard Calibrations
Standard calibrations are used to ensure that the reported concentration of GreenFeed gas
sensors are correct. This is done by running two separate and distinct known gas
concentrations into the system one at a time. The first gas run is usually referred to as the
“Zero” gas. This gas will typically consist of the following constituent concentrations:
1) Oxygen (O
2
): ~20% (200,000ppm)
2) Nitrogen (N
2
) Balanced - which means the rest of the gas consists of nitrogen
The second gas is commonly referred to as the “Span” gas. This gas must consist of a known
concentration of all gases intended to measure with GreenFeed. This will typically consist of
the following constituent concentrations:
1) Oxygen (O
2
): ~20.5% (205,000ppm) - Note that this must be a different
concentration from the zero gas
2) Methane (CH
4
): ~500ppm (0.05%)
3) Carbon Dioxide (CO
2
): ~5000ppm (0.5%)
4) Hydrogen (H
2
): ~10ppm
5) Nitrogen (N
2
) Balanced
It is important to note that the gas concentrations are not required to be exactly these
values, but if ordering your own gases, these concentrations are ideal.
Standard Calibrations are done automatically by GreenFeed, but ensuring the gas tanks are
installed correctly without leaks is crucial to performing a valid standard calibration. For
assistance with ensuring your gas tanks are properly installed without leaks, please contact
support@c-lockinc.com.
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