cold water meter
Best to know this before you choose a water meter 28 Mar 2019
knowing  water meter basic knowledge before choose a right product


What is a water meter? A device used to continuously measure ,memory and display the volume of water flowing through a measurement sensor under measurement conditions. In general, water meters are used to measure the amount of water used to ensure a fair and reasonable trade settlement tool between the water supplier and the water user.

1 Type and classification of water meters

The classification principle of water meters is many According to the measurement principle and structure. Measuring medium Measuring tube diameter Measuring purpose The classification method of indicating value is the main classification method.

1.1 According to the measurement principle, it is divided into velocity type water meter and volumetric type water meter.

Both rotary-vane wheel water meters and helix woltman water meters are velocity water meters. It is installed in a closed pipe that consists of a moving element and is directly driven by the velocity of the water to obtain the velocity of the water.

A volumetric water meter is a water meter having a piston structure installed in a closed duct, a chamber of known volume that is filled and discharged successively, and a fluid-driven mechanism.

1.2 According to the nominal diameter The water meter with a diameter of 40mm or less is called a small-diameter water meter. The water meter with a diameter of 50mm or more is called a large-diameter water meter. The connection method for the small-diameter meter is screwed. The large-diameter meter is flanged.

According to the measurement purposes, it is usually divided into residential water meters and industrial water meters. residential water meters refer to water meters used for settlement of household water. Other uses are classified into industrial meters. Industrial water meters are generally large-diameter water meters.

According to the installation direction, it is generally divided into a horizontal installation water meter and a vertical installation water meter. The water meter on the water meter dial is marked with 'H'. The water meter on the horizontal installation water meter is marked with 'V'. The water meter on the vertical installation water meter is not marked. Generally, the water meter is installed horizontally and the volumetric water meter can be installed horizontally or vertically.

1.5 According to the temperature of the medium, it is generally divided into a cold water meter and a hot water meter. The water temperature of the medium temperature is greater than 0.1 to 40 degrees. The water meter with a temperature of 0.1 to 90 degrees or more than 90 degrees is a hot water meter. When there is no mark on the dial, it is usually a cold water meter. According to the medium pressure, it can be divided into ordinary water meter and high pressure water meter. The nominal pressure of ordinary water meters is generally 1 trillion.

According to whether the counter is immersed in water, it is divided into wet type and liquid-sealed water meter. The typical performance difference is whether the surface lense of the water meter is subjected to pressure. The mechanical sensor of the water meter and the counter are driven by direct gear linkage or magnetic steel coupling transmission.

1.7.1 Wet water meter The water meter whose counter is immersed in water The glass of the meter is subjected to water pressure. The transmission of the sensor and the counter is gear linkage. The quality of the water meter after using the water meter for a period of time will affect the clarity of the meter reading.

1.7.2 Dry water meter The water meter whose counter is not immersed in water. Structurally, the sensor is separated from the chamber of the counter. The surface lense of the water meter is not subjected to water pressure. The transmission of the sensor and the counter is generally driven by a magnetic .

1.7.3 Liquid-sealed water meter The meter-register wheel or the entire counter for meter reading is prepared by using a certain concentration of glycerin or the like to prepare a liquid-sealed water meter. The clarity in the sealed isolated counter is not affected by external water quality. The rest of the structural performance is the same as for wet water meters. A liquid seal that is only a part of the digit rollerl is called a semi-liquid sealed or a small liquid seal.

1.8 According to the indication type of the counter, it is generally divided into C type meter (also known as pointer type or analog type) and E type meter [also known as word wheel type or word wheel pointer combination analog and digital combination type] 1.9 The number of water jets according to the driving impeller The rotary vane water meter is divided into a multi-jet water meter and a single-jet water meter according to the number of water jets driving the impeller [referred to as a single jet meter)

1.10 According to the accuracy level The water meter is divided into a Class A water meter and a Class B water meter according to the maximum allowable error. The majority of domestic water meters are Class B water meters. The maximum allowable error of Class B water meters is ±5% from the minimum flow rate Q1 [including Q1] to the boundary flow Q2 [excluding Q2]. From the boundary flow Q2 [including Q2] to 1 overload The high zone of flow Q4 [including Q4] is ±2% hot water meter

It is ±3% in the upper zone. If the accuracy is not indicated on the water meter dial, it can be regarded as a Class B water meter.

2. Model name of the water meter The model number of the water meter consists of two sections. The first section consists of four letters. The first letter L, is the major class code to which the product belongs. The water meter belongs to the flow meter category. The second letter X, is the subclass to which the product belongs, that is, the water meter. The third and fourth digits indicate the working principle of the product, structural features and so on. The third letter specifies the following S - representing the rotor type water meter L - representing the horizontal helix woltman water meter - representing the vertical helix woltman water meter - representing the double-type water meter R - representing the quantitative water meter FD The fourth letter is defined as follows - Represents vertical water meter - represents hot water meter R - represents positive countercurrent water meter L - represents dry water meter NGY - represents liquid water meter C - represents detachable water meter The nominal caliber letters represent the indicator device type and product design sequence number.

2.1 Water meter model example interpretation LXS—15C~50C rotary vane wheel wet type C water meter. The dial counter is an analog LXS-15E~50E rotor wet E-type water meter. The dial counter is a digital word combination LXSG-15E~50E Rotary vane wheel dry E-type water meter The dial counter is a digital character wheel combination. LXSY—15E~59E Rotary vane wheel liquid seal type E water meter. The dial counter is a digital character wheel combination. LXL—80C~200C Horizontal helix woltman type C water meter The dial counter is an analog type. LXL—80E~200E horizontal screw type E type water meter
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