“The 150NA offers a high degree of safety with operating convenience and is especially suitable for applications with large acetylene consumption and high requirements regarding a fail-safe gas supply,” is how Product Manager Andreas Heyer sums up the advantages of the new WITT pressure regulating station.
The highlight of the system is a switchover device that changes fully automatically between two connected gas sources, as required. “Pressure transmitters monitor the filling level of the connected cylinder batteries or trailers,” declares Andreas Heyer. “If a gas cylinder empties, the system switches to the full one without interruption.”
The “Gas Control 50” control unit made by WITT forms the electronic heart of the system, indicating the filling level of the containers via a colour graphic display. The limit values of the switchover can be set freely at the touchscreen control. Upon reaching the limit value, users are assisted via an alarm system alerting them to the need for an intervention. Connections for external signal generators are also available. If the acetylene pressure typically recovers after some time, users can switch over to this gas source again in order to remove the residual volume before the bundle is finally replaced. That means the system can utilise the container, emptying it to the maximum.
The automatic opening and closure during the switchover occurs smoothly via motor-powered stopcock instead of simple solenoid valves. “A gentle solution to avoid the otherwise abrupt pressure peaks,” states Heyer. This ensures a constant working pressure and spares the downstream pressure controller. The system shuts down automatically in the event of a fault. On request, the pressure control station can continue to be used in manual operation, thereby maintaining the gas supply.
The 150NA keeps the outlet pressure “extremely stable” for the working process, even during intense fluctuations in the inlet pressure and flow rate. According to WITT, the manifold pressure regulator of the type ADR150 is the world’s most powerful dome pressure regulator of its kind. It is integrated into the 150NA as a subsystem for pressure reduction, including relief valve, control pressure regulator and pressure gauges.
It also contains the required safety technology, comprising a decomposition arrestor HDS 17, the safety group 645 with four safety devices of the type 85-30 as well as gas non-return valves, all made by WITT. On request, additional components like an acetone separator can be integrated into the system. The system approved for ATEX Zone 2 is fully pre-assembled, tested and immediately ready for use. The extraordinarily sturdy system is suitable for wall mounting. For more information, go to www.wittgas.com.
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