Functional description

The intended use of the Pressure control panel BM55-2A is the expansion of a gas from a gas source and the distribution of the gas with adjustable outlet pressure.

The 2A pressure control panels are two-sided pressure control panels with a switching mechanism (2A). The switching mechanism switches automatically from the side that is currently in operation to the reserve side when the gas supply situation requires it.

The pressure is reduced by the pressure regulator which is fitted behind the Ambimat (change-over panel). In turn, the Ambimat switches from the side currently supplying the gas (operating side) to the reserve side when what is referred to as the changeover pressure is reached.

Selection of the operating side and changeover to the reserve side are performed completely automatically. Initially, the side first pressurised is in operation. When the supply pressure sinks towards the changeover pressure which is preset via the pressure control panel configuration, the Ambimat switches automatically from the operating to the reserve side. The changeover process also completely isolates the supply side which has just been taken out of operation from the gas supply. This means that a separate process gas valve is not required.

The changeover pressure is generally dependent on the prevailing pressure of both supply sides. On the one hand, changeover only takes place when the pressure on the operating side drops to the changeover pressure or below, while on the other hand, the pressure on the reserve side must be at a certain minimum level that allows it to function as the actuating pressure for changeover to the reserve side.

Under ideal conditions, the gas sources will be full of gas at the pressure P1 listed on the type plate of the switching station. If this is the case, changeover takes place at a pressure slightly above the pressure P2 indicated on the type plate. If a gas source below the specified pressure P1 is connected to the station, changeover takes place at a pressure below P2. Below a certain pressure limit, the pressure on the reserve side is no longer sufficient and changeover cannot take place.

NOTICE

Combination of connection block and contact pressure gauge

With the connection block (CB) and contact pressure gauge (K) combination, an alarm is issued for each purge cycle. In this case, we recommend a valve (V) and contact pressure gauge (K) combination.