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• The long-term gas mass leak rate = change in gas mass calculated using the long-
term pressure leak rate and the nominal gas mass in each tank, scaled to a year (in
mass unit per year)
• The long-term gas percentage leak rate = change in gas percentage calculated using
the long-term pressure leak rate and the nominal gas mass in each tank and the gas
density, scaled to a year (in mass unit per year)
Two values need to be entered during setup for:
• Initial gas pressure = Nominal (fill) gas pressure
• Initial gas mass = Nominal (fill) gas mass per tank (so the total mass divided by 3 if
there are 3x tanks)
These values are available from the CB name plate
HMI: Settings/Gas monitoring
Since we know the density of the gas at 20
and since we also keep in the long-term stack both the pressure at 20
can therefore calculate the "Long term gas density change rate" in g/l/yr
The long-term gas mass leak rate = Long term gas density change rate x Mass of gas in the
tank
The long-term gas % leak rate = Long term gas mass leak rate / Nominal (fill) gas mass
MA-037 - CB Watch 3 Operating Manual
Figure 78 – Typical CB nameplate with gas info
Figure 79 – Nominal gas values entry
o
C that goes with these 2 nameplate information
v7.0 - May 2020
o
C and the density, we
Page 54 of 118
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