The equations used by the Portasteele® CALCULATOR are highly accurate, as long as the dimensional data supplied is accurate. If you are finding that the agent weight is consistently too low, please check the following:
You have entered all the dimensional data of the cylinder correctly
You are using the agent weight and not the gross weight
In some cases, agent weight is not printed on the cylinder so you may use the gross weight minus the tare weight. In this case, please ensure that you consider the valve weight.
For liquified clean agents, the cylinder will contain pressurised nitrogen as a propellant. Different manufacturers will either include or exclude this weight from the quoted agent weight. The Portasteele® CALCULATOR does not include this.
Ensure that that you have found, measured and entered the liquid level correctly.