Arcmed Bio-Chem Solenoid Operated Micro-Pump 139SP Series

What is a Solenoid Operated Micro-Pump? A Micro-Pump is a solenoid operated device designed to provide a precise, repeatable and discrete dispensed volume of fluid. The flow path is isolated from the operating mechanism by a flexible diaphragm. When the solenoid is energized the diaphragm is pulled back creating a partial vacuum within the pump body. This pulls liquid through the inlet check valve (A) and simultaneously closes the outlet check valve (B). When the solenoid is de-energized a spring pushes the diaphragm down expelling a discrete volume of liquid through check valve B while simultaneously closing check valve A. Bio-Chem Fluidics solenoid operated Micro-Pumps require a complete on-off cycle for each discrete dispense (see below). Repeatedly cycling the solenoid creates a pulsed flow. Features of the Bio-Chem Fluidics solenoid operated Micro-Pump: Inert materials Our pumps provide a non-metallic inert fluid path for the dispensing of high purity or aggressive fluids. We offer a range of different materials available for all the wetted parts of the pumps - body, diaphragm and check valve. Material combinations can be chosen to suit the application. Body materials: PPS, PTFE, PEEK„¢, POM Diaphragm materials: EPDM, PTFE Check valve materials: EPDM, FKM, FFKM   Self-priming  At start-up, the pump is able to draw air. The suction created by the larger pumps is sufficient to pull liquids from an unpressurized container located up to 4™ 3 (1.3m) beneath the pump. Once the pump is primed, it is able to generate around 5psi (0.3bar) pressure, equating to 11™ 6 (3.5m) of water. Continuous duty The pumps are designed for continuous duty. They are suitable for up to 20 million actuations, corresponding to nearly 3,000 hours of continuous use at a 2 Hz cycle rate. Accurate discrete dispense volumes Dispense volumes range from 4µl to 250µl per cycle. The pumps can be cycled at up to 4 Hz for the smallest version and 1.6 Hz for the largest. Pumps can be operated at less than the maximum cycle rate by increasing the length of the œoff time. The œon time should remain unchanged to retain dispense accuracy.