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  2. Electrical conductivity meter - Wikipedia

    en.wikipedia.org/wiki/Electrical_conductivity_meter

    An electrical conductivity meter (EC meter) measures the electrical conductivity in a solution. [1] It has multiple applications in research and engineering, with common usage in hydroponics , aquaculture , aquaponics , and freshwater systems to monitor the amount of nutrients, salts or impurities in the water.

  3. Pressure Equipment Directive (EU) - Wikipedia

    en.wikipedia.org/wiki/Pressure_Equipment...

    The Pressure Equipment Directive (PED) 2014/68/EU (formerly 97/23/EC) [1] of the EU sets out the standards for the design and fabrication of pressure equipment ("pressure equipment" means steam boilers, pressure vessels, piping, safety valves and other components and assemblies subject to pressure loading) generally over one liter in volume and having a maximum pressure more than 0.5 bar gauge.

  4. Parts-per notation - Wikipedia

    en.wikipedia.org/wiki/Parts-per_notation

    Parts-per notation is often used describing dilute solutions in chemistry, for instance, the relative abundance of dissolved minerals or pollutants in water. The quantity "1 ppm" can be used for a mass fraction if a water-borne pollutant is present at one-millionth of a gram per gram of sample solution.

  5. IEC 60204 - Wikipedia

    en.wikipedia.org/wiki/IEC_60204

    IEC 60204-1 / EN 60204 Safety of machinery – Electrical equipment of machines – Part 1: General requirements This is a standard published by the International Electrotechnical Commission (IEC), published in parallel by CENELEC ( European Committee for Electrotechnical Standardization ).

  6. Reduced pressure zone device - Wikipedia

    en.wikipedia.org/wiki/Reduced_pressure_zone_device

    A reduced pressure zone device (RPZD, RPZ, or RPZ valve) is a type of backflow prevention device used to protect water supplies from contamination. RPZDs may also be known as reduced pressure principle (RP), reduced pressure principle backflow prevention devices, [1] [2] reduced pressure zone assemblies (RPZA), [3] or reduced pressure principle ...

  7. Water flow test - Wikipedia

    en.wikipedia.org/wiki/Water_flow_test

    A set of three water pressure measurements are recorded from two hydrants. One hydrant is known as the residual hydrant or test hydrant and is located on or near the water main where a new water connection is desired. From this test hydrant, a static pressure and a residual pressure will be measured.

  8. NCH Corporation - Wikipedia

    en.wikipedia.org/wiki/NCH_Corporation

    Among NCH's acquisitions that year was a line of stainless steel flexible tubing connectors. These new products were marketed under the trade name Aqua-Flo. By the end of fiscal 1992, NCH's plumbing group was offering a total of more than 80,000 different parts. The Resource Electronics group's line had grown to over 40,000 parts by this time ...

  9. Hydrostatic test - Wikipedia

    en.wikipedia.org/wiki/Hydrostatic_test

    A hydrostatic test is a way in which pressure vessels such as pipelines, plumbing, gas cylinders, boilers and fuel tanks can be tested for strength and leaks. The test involves filling the vessel or pipe system with a liquid, usually water, which may be dyed to aid in visual leak detection , and pressurization of the vessel to the specified ...

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