DESCRIPTION The system uses a high-pressure piston-recirculation pump to circulate product through the filter module of choice. Thevariable speed triple-piston design combined with high-pressure flexibles minimises pressure pulsation. The operator can use their own feed vessel or this can be specified (FT18-20 option). The speed of the recirculation pump can be adjusted to suit the particular filtration module and the product. A level sensor mounted on the pump inlet protects the pump from running dry. The retentate back-pressure valve enables pressures up to 50 bar to be achieved. A relief valve protects against overpressure. There is a permeate back-pressure valve so that accurate transmembrane pressures (TMP) can be set. Pressure sensors are sited on the retentate side on the inlet and outlet of the filter module, as well as on the permeate side. Any temperature gain in the retentate through recirculation at high pressure is removed using a 316 stainless steel shell and tube heat exchanger, which has corrugated tubes for improved heat transfer. The transmembrane pressure can be finely controlled with independent back pressure valves. This reduces the fouling on the membrane when operating at higher pressures, extending the lifetime of the membrane. TECHNICAL SPECIFICATIONS Maximum flow rate: 1400 l/hr Maximum operating pressure: 50 bar (See filter module options) Pressure sensors: 0-60 bar Mass balance range: 0-6kg Minimum test volume without FT18-20: 15L
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