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Thứ ba, 20/08/2013

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Use the resin selection guide* below to compare the physical and chemical properties of the plastics used in our tanks, and to determine which of the resins is best suited to your application. For applications where a plastic resin is not suitable, select one of our stainless steel tanks.

Please note that both operating conditions and type of chemical can decrease maximum service temperature. Continuous service temperatures in ranges above ambient can affect tanks in at least two ways: (1) the useful life of the tank may be shortened; and (2) the ability of the container to maintain its shape may decrease, perhaps resulting in distortion.

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H??ng d?n l?a ch?n b?m ch?t l?ng

Thứ ba, 20/08/2013

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Use the guide below to help you select the best type of pump for your application. This information is intended as a general guideline and will not hold true for all pumps within a classification; check individual pump specifications on the given product pages for complete details.

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Thứ ba, 20/08/2013

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Valve Terms
  • Breaking Pressure:
    The minimum pressure required to produce flow through a valve.
  • Duty Cycle:
    100% duty cycle is defined as continuous operation without any damage occurring. For intermittent duty cycle (<100%), alternate energized and de-energized state at regular intervals to allow the valve to completely cool down to room temperature. 
    F = active concentration / total concentration

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H??ng d?n ch?n ?ng

Thứ ba, 20/08/2013

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Use the "Tubing Selection Guide" below to help you select the appropriate tubing for your application. The Chemical Compatibility guide and the chemical resistance summary in the table below are only guidelines. Chemical resistance and tubing wear may vary according to use—always test the tubing you select under the actual conditions.

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H??ng d?n l?a ch?n b?m ?o l?u l??ng

Thứ ba, 20/08/2013

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Metering pumps move precise volumes of liquid in a specified time period to provide accurate flow rates. This class of pumps moves liquids in two stages: the suction stroke and the discharge stroke. During the suction stroke, liquid is pulled into the pump cavity past the inlet check valve. During the discharge stroke, the inlet valve closes; the outlet valve opens, and the liquid is pushed out. Vary the flow either by changing the stroke length or by adjusting the cycle frequency. Described below are a few types of metering pumps listed in this catalog—bellows, diaphragm, and piston.

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Thứ ba, 20/08/2013

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Strainers—provide coarser filtration for removing dirt, debris, and particulates from your pipeline. They provide a great first stage filtration before utilizing finer filtration elements. For liquid filtration application only.

Liquid Cartridges—our diverse selection of double open end cartridges include autoclavable, bacteria inhibiting, resin-bonded, spun polypropylene, and pleated cartridge designs.

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Thứ ba, 20/08/2013

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Selecting a Filter

  1. Determine the particle size to be retained or filtered. Membranes will retain all particles equal to, and then larger than their designated pore size.

  2. Assess the chemical compatibility of the membrane filter with the liquid or gas to be filtered. Consider the chemical resistance properties of the all parts that will contact the filtrate.

  3. Depending on the procedure performed, the membrane color or surface pattern may be important.

  4. Also consider hydrophilic or hydrophobic membranes; temperature, flow rate, throughput, and sterilization needs.

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Thứ ba, 20/08/2013

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Cole-Parmer makes every attempt to publish a representative flow versus back pressure curve. In many cases, we can also furnish performance curves that quantify parameters such as NPSHreq.

NPSHreq: The Net Positive Suction Head that must be available to the pump for cavitation-free operation. NPSHreq is typically expressed in either foot of head or units of pressure.

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Thứ năm, 23/08/2012

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Chuy?n ??i h? inch sang h? met

Thứ năm, 23/08/2012

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