Sampling pumps are used to monitor liquids, air, and gases. They are usually portable and developed for specific tasks. Some sampling pumps are designed to move abrasive materials, acids, chemicals, coolants, hazardous materials, gasoline, diesel fuel, industrial lubricants, or oil. Other devices are rated for corrosive, combustible, and high viscous media. Sampling pumps are also used to move ground water, potable water, liquids with solids, and gases or air media.
Types of Sampling Pumps
Many types of sampling pumps are available. Borehole pumps feature hydraulic heads and are typically installed in wells. Diaphragm pumps, the most commonly used type of positive displacement pump, include a diaphragm and chamber, as well as suction and discharge check valves to prevent backflow. Peristaltic pumps move media through a tube that is compressed at a number of points through contact with rollers or shoes. Metering pumps feature a high level of repetitive accuracy and are capable of pumping a wide range of fluids. Gear pumps provide a more continuous, less pulsating flow than many other positive displacement pumps. In terms of sealless devices, magnetic drive pumps feature a coaxial magnetic coupling that transmits torque to an impeller. Drum pumps, which are driven by a variety of methods, are designed to transport or dispense the contents of drums, pails, or tanks. Other types of sampling pumps include hand pumps and micro pumps, specialized devices that move fluids in miniaturized systems.
Sampling pumps are available with a variety of features. Adjustable speed pumps can operate at speeds selected by an operator while continuous duty pumps maintain performance specifications at 100% duty cycle. Run dry capable pumps can operate without pumped fluid or external lubrication for an extended period of time. Self-priming pumps are designed to create and maintain a vacuum level that is sufficient to draw fluid into the inlet without external assistance. Some sampling pumps include a control panel, battery backup, or suction. Other sampling pumps are corrosion resistant or explosion proof. Hygienic and wash down duty models are also available. Non-clog pumps can move sticky or stringy materials.
Important specifications for sampling pumps include maximum discharge flow, maximum discharge pressure, inlet size, discharge size, and media temperature. Power sources include alternating current (AC), direct current (DC), compressed air, gasoline, diesel fuel, hydraulic systems, natural gas, water, steam, and solar energy. Pumps that do not include a power source typically provide a drive shaft for connection to a motor. Manually powered pumps rely upon hand or foot power.
Sampling pumps are used in a variety of industrial, municipal, and specialty applications. Examples include agriculture and horticulture, dairy farms, breweries and distilleries, food processing, and oil and gas production. Sampling pumps are also used in the aerospace and defense, mining, medical, pharmaceutical, and semiconductor industries. Devices for heating, ventilation and air conditioning (HVAC) systems are also available.
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Magnetic Drive Pumps
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Positive Displacement Pumps
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