Apr 22 2015

Characteristics and classification of volumetric water meter

1, an overview of positive displacement meter

Positive displacement water meters are installed in closed conduits, some being full and the successive emissions Chamber of known volume of fluid and with fluid-drive mechanism of a meter. Because with pistons rotating to record the amount of drinking water through the pipe, also known as piston water meters, with initial flow of small, high precision, hygiene, easy reading and so on. Especially suitable for high quality, high cost of water for the occasion. As volumetric water meter repair debug more complex and high requirements for quality reasons, not yet widespread use in our country.

2, volumetric water meter characteristic

⑴ LCD display, convenient and intuitive readings, and instantaneous flow rate display cumulative flow.

⑵ test mode displays the cumulative flow of higher resolution, small-diameter minimum resolution: 0.00001m 3.

C with the zero function, each time you enter the test mode, the cumulative flow of test mode is cleared to zero, more applicable industrial ingredients measure the water.

⑷ rotating piston structure, with a small initial flow rate, high measuring accuracy, wear-resistant, non-rotational inertia and so on.

⑸ can be horizontal, vertical, inclined installation does not affect the accurate measurement of water meters.

⑹ with antimagnetic interference function, pleasing in appearance, small size, light weight and so on.
Volumetric (Piston) Type Water Meter

3, positive displacement meter classifications

Rotary piston volumetric water meter type and disc type, the two series, when the water flow through the meter, and water-driven piston (disc) rotation (Swing), and piston-cylinder (disk) the volume is constant, so the piston rotation measured by counting bodies (disc swing) number can be informed of water flow through the meter.

The main products for rotary piston volumetric water meter water meter, disc-type water meter did not use abroad for only the United States and a few other countries. Rotary piston meters for small caliber specifications, is characterized by high level of measurement (up to level c and level d) ability, high sensitivity, low flow rate measurement. Primarily used for metering of pipeline pure water in China, Ningbo Guoxin instrument technology limited, water meter products represented, meter size typically 8, 15, and 20mm.
Source:http://asmeter.com/

Jun 06 2014

Error of Rotary Piston Volumetric Type Water Meter, characteristics, the main technical parameters and Principles

Volumetric meter is also called the piston type water meter, is a constant flow type water meter. The national standard in the volumetric meter is defined as “installed in the closed pipe, by some to be a water meter chamber volume successive full known and discharge fluid and with fluid driven mechanism.

Rotary Piston Volumetric Type Water Meter

Volumetric meter with rotary piston type and disc type two series, when the water flow through the meter, the drive piston flow (circle

Rotating disc) (swing), and a piston cylinder (disk chamber) volume is constant, so, by counting the measured piston rotation mechanism

Turn (disc swing) times, can get through the Rotary Piston Volumetric Type Water Meter of water.

Product volume type water meter is the main rotary piston type water meter, see figure C.5 and figure C.6 appendix C. Disc type water meter is not used in the domestic, abroad also only a few countries America etc.. Rotary piston type water meter is generally small caliber specification, is characterized by measuring high level (up to C grade and D grade), small flow measurement capability, high sensitivity. At present is mainly used for the measurement of pipeline pure water, water purification water to produce drinking water meter water Limited by Share Ltd Ningbo and Ningbo Donghai instrument channel limited company as the representative, in the water meter diameter is 8, 15 and 20ram. Volumetric meter repair debugging complex, high requirement on quality, used in China has not yet been widely.

Under the action of water pressure, water from the lower water inlet into the measurement chamber, center 3 driven rotary piston 7 surround the measurement chamber shaft to rotate, and the water from the piston blank and piston and the measuring chamber wall surface formed by the air flows to the upper outlet, at the same time the piston rotates, connected by a rotating shaft 4 and shifting fork 5 and counting mechanism, so as long as the note of piston rotation times, can flow through the water volume.

Features and main technical parameters:

The Volumetric Piston Type Nylon Plastic Water Meter(Dry Register) type metering mechanism, high precision measurement, counting mechanism adopts a special liquid packaging, has the characteristics of clear reading of delicate appearance, water inlet is provided with a check valve can prevent backflow. According to user requirements can increase the converted into electrical signal output, can realize remote reading purpose.

Use:

The total record of potable water.

Conditions of use:

Temperature class: T30

Pressure rating: MAP10

Pressure loss grade: P63

The upstream flow sensitivity level: U5

Flow sensitivity level: D0

The maximum permissible error:

A) low area (Q1 ≤ Q < Q2) maximum permissible error of ± 5%

B) high (Q2 ≤ Q ≤ Q4) maximum permissible error of ± 2%

http://www.asmeter.com