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| ITT PumpSmart with sensorless flow measurement  ITT Monitoring & Control introduces Version 5.0 for the PumpSmart PS200. Some of the technical highlights of V5.0 are SmartFlow, Advanced Pump Protection, Positive Displacement Pump Protection and SmartControl. SmartFlow is a sensorless flow measurement function which will have the ability to calculate the flow of a centrifugal pump with in ±5% of the pump rated flow without the need for any external instrumentation. This function mathematically models the pump power curve with only four points of CDS pump performance curve data, BEP flow, BEP power, shut off power and rated speed.Advanced Pump Protection, APP, is a sensorless pump protection function that takes into account the hydraulic and mechanical loses associated when changing the speed of a centrifugal pump. A self calibration feature allows for an accurate representation of the pump to ensure the pump is protected at all speeds. Positive Displacement Pump Protection, PDPP, is a sensorless function that it is protecting for a constant torque load such as a positive displacement pump. Because PDPP is used with constant torque loads it does not take into account changes in speed such as APP. PDPP monitors for conditions such as high and low torque which can be an indication the pump has a blocked discharge or a starved suction. SmartControl is an improved way to control pumps with flat head-capacity curves where a small change in speed can lead to a large change in flow. A flat head-capacity curve can make tuning a pump system difficult leaving the pump to oscillate around the setpoint. In general to increase the flow of the pump the speed is increased and sub sequentially the torque increases as a result. With SmartControl the exact opposite happens as were to increase the flow of the pump the pump torque is increased and sub-sequentially the pump speed follows. The advantage is that the torque performance curve is much steeper relative to speed and can typically yield a control resolution 2-3 times greater then speed. write your comments about the article :: © 2006 Construction News :: home page |