The Series NXT3000 Gas Feed System is a family of vacuum-operated, solution-feed gas dispensing components including a vacuum regulator, meter assembly, and a selection of ejectors to meet project requirements for feeding chlorine, sulphur dioxide, ammonia or carbon dioxide gas. The Series NXT3000 is a versatile, high quality system which operates at sonic conditions eliminating the need for regulating differential pressure across the rate control valve. Proven design, rugged construction, and the use of the best available materials assures precise gas feeding, low maintenance and dependable operation for the life of the equipment.
The vacuum regulator mounts directly on a 75 kg cylinder, a tonne container, or on the wall. When tonne container or wall mounted, a liquid trap and heater are provided to prevent liquefied gas from reaching the regulator.
As required for the application, one meter assembly may be integrally mounted and a second remotely mounted in series. Only one control valve (manual or automatic) may be installed in the system. The meter assemblies are designed to permit ganging multiple meters for wall mounting to multiple feed points.
Several ejector choices are available for the Series NXT3000 system.
EJ100/200/500 ejectors can be used for general applications. These incorporate an O-ring and diaphragm type check valve. For more demanding applications – for on-off service, anti-siphon and high back pressure, up to 1380 kPa, the EJ17 ejector can be used. In addition, a Chlor-A-Vac chemical induction unit can be used as the vacuum source for the system.
For applications requiring uninterrupted gas feed a built-in automatic changeover function is provided in every vacuum regulator. Only two vacuum regulators are required. No separate changeover module or valve is required, but for complex vacuum changeover systems the Series NXT3000 vacuum regulators can be used with the Capital Controls series of automatic vacuum switchover modules.
Only one vacuum regulator is required to feed maximum capacities up to 250 kg/d (chlorine). Maximum capacities for other gases are as follows: Sulphur Dioxide – same as chlorine; Ammonia – 120 kg/d; Carbon Dioxide – 170 kg/d The maximum feed capacity is dependent on the gas source.
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