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2. Mueller Systems - Wikipedia

   en.wikipedia.org/wiki/Mueller_Systems

   Mueller Systems was founded in 1859 as Hawes and Hersey Company in Boston, Massachusetts and was a manufacturer of bolts, rotary pumps, and other machinery. [3] [4] In 1885, the company received a patent on the rotary displacement meter and began manufacturing water meters under the name Hersey Meter Company, offering its first rotary and disc meters for sale in 1886.

3. Thermal mass flow meter - Wikipedia

   en.wikipedia.org/wiki/Thermal_mass_flow_meter

   A second type is the capillary-tube type of thermal mass flow meter. Many mass flow controllers (MFC) which combine a mass flow meter, electronics and a valve are based on this design. Furthermore, a thermal mass flow meter can be built by measuring temperature differential across a silicon-based MEMS chip.

4. Flow measurement - Wikipedia

   en.wikipedia.org/wiki/Flow_measurement

   Because they are used for domestic water measurement, piston meters, also known as rotary piston or semi-positive displacement meters, are the most common flow measurement devices in the UK and are used for almost all meter sizes up to and including 40 mm (1 + 1 ⁄ 2 in). The piston meter operates on the principle of a piston rotating within a ...

5. Chilled water - Wikipedia

   en.wikipedia.org/wiki/Chilled_water

   A chiller used to create chilled water as part of a chilled water system. Chilled water is a commodity often used to cool a building's air and equipment, especially in situations where many individual rooms must be controlled separately, such as a hotel. The chilled water can be supplied by a vendor, such as a public utility, or created at the ...

6. Turndown ratio - Wikipedia

   en.wikipedia.org/wiki/Turndown_ratio

   Note that meter manufacturers state their products' turndown ratios—a specific product may have a turndown ratio that varies from the list below. [citation needed] A thermal mass flow meter has a turndown ratio of 1000:1. An orifice plate meter has a practical turndown ratio of 3:1. A turbine meter has a turndown ratio of 10:1.

7. Hydrocarbon dew point - Wikipedia

   en.wikipedia.org/wiki/Hydrocarbon_dew_point

   A key component in chilled mirror dew point measurements is the subtlety with which condensate can be detected — in other words, the thinner the film is when detected, the better. A manual chilled mirror device relies on the operator to determine when a mist has formed on the mirror, and, depending on the device, can be highly subjective.