Under Charge
The pressure inside the hydrophore is below the rated pressure range and is called under charged condition. This condition is the result of air leaking from either; relief valve, isolation valve, air supply valve, vent valve or the gauge glass itself. The situation can be found with no water supply at the accommodation top.
Over Charge
The pressure inside the hydrophore above the rated pressure is called overcharged condition. This condition is because of a leak in the air supply valve. The situation can result in no water in the hydrophore tank in some cases and thus be reacted quickly with care.