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Product display and construction case

LLQZ Gas Waist Wheel Flowmeter

LLQZKY-DN50 temperature and pressure compensation type

I. Overview
Gas waist wheel flowmeter is a kind of gas monitoring and measuring instrument with high accuracy, high reliability and wide range.
Intelligent gas waist flowmeter is a new type of flowmeter that integrates flow, temperature, pressure sensors and intelligent instruments on the basis of waist flowmeter.
Intelligent gas waist flowmeter gas is an ideal instrument for measuring non-corrosive gases such as natural gas, city gas, propane, nitrogen, and industrial inert gases.
The main features of the product:
Wide range:
According to different specifications, higher range can reach 1: 216
Low starting flow:
According to different specifications, the lower starting flow can reach 0.04m3 / h.
High precision and high repeatability:
The long-term accuracy is not affected by the medium, and the long-term operation is stable and accurate.
Low pressure loss:
According to different specifications, the pressure loss is 0.08kPa-0.58kPa.
High integration and low power consumption
Using advanced microcomputer technology and high-performance integrated chips, the whole machine is powerful and superior in performance.
Compact structure:
The pressure sensor, temperature sensor and flow sensor are all built-in, making the structure more compact.
Digital pressure temperature sensor
Digital temperature sensor and digital pressure sensor configuration, independent calibration and verification, easy replacement, maintenance and use.
Segment correction
According to the flow frequency signal, the meter coefficient can be automatically linearly corrected in six segments to improve the meter's wide range accuracy.
Full data storage capabilities,
The E2PROM data storage chip is used to save user parameters and factory parameters. The timely data saving function can prevent data loss during sudden power failure. Under power failure, internal parameters can be stored for a long time.
The basic output is complete.
The intelligent flow meter has pulse output of base meter, pulse signal of working condition or calibration condition, and calibration pulse output. RS485 interface output, can also output 4 ~ 20mA standard analog signal according to user needs.
Data traceability management
Real-time database, query and analysis through RS-485 communication interface.
GPRS real-time management system
In this series, the G-type meter has GPRS transmission function, which can realize the transmission function online, timed, and fixed point. It monitors the data of instruments, control valves, pipeline pressure, gas alarm, etc. It is extremely easy to set up a GPRS wireless network system.

Structure and working principle

流量计由 5 个部分组成(见图 1 2.1 . Intelligent waist wheel flowmeter consists of 5 parts (see Figure 1 )

 

 

气体腰轮流量计 2)温度传感器3)压力传感器4)流量传感器5)智能流量积算仪 1) Gas waist wheel flowmeter 2) Temperature sensor 3) Pressure sensor 4) Flow sensor 5) Intelligent flow totalizer

Figure 1 Schematic diagram of intelligent waist wheel flowmeter

(见图 2) 2.2. The working principle of intelligent gas waist flowmeter (see Figure 2)

Intelligent gas waist flowmeter is mainly composed of housing, conjugate rotor and intelligent flow totalizer. P )作用下,通过精密加工的调校齿轮使转子保持正确的相对位置。 A pair of conjugate rotors installed in the measuring chamber are kept at the correct relative position by a precision-machined adjustment gear under the action of the pressure difference between the inlet and outlet of the circulating gas ( P in > P out ). A good working gap is maintained between the rotors, between the rotor and the casing, and between the rotor and the wall plate, and continuous non-contact sealing is achieved. Each time the rotor rotates, it will output four times the effective volume of the measuring chamber. The measurement process and working principle are shown in Figure 1 (the figure shows only a quarter of the cycle).

2.3 The working principle of the intelligent flow totalizer The intelligent flow totalizer is composed of temperature and pressure detection, flow sensor and microprocessor unit. The microprocessor in the intelligent flow totalizer performs temperature and pressure compensation according to the gaseous equation and corrects the compression factor. The gaseous equation is as follows:
(1)
In the formula: Q: volume flow rate (m3 / h) under standard conditions; Q0: volume flow rate (m3 / h) under working conditions;
Pg: gauge pressure at the pressure detection point of the flow meter (kPa); Pa: local atmospheric pressure (kPa);
Tg: positive temperature of the medium (273.15 + t) (K); t: temperature of the measured medium (° C);
Zn: compression coefficient in standard state; Zg: compression coefficient in working state;
Tn: positive temperature under standard conditions (273.15 + 20) (K); Pn: standard atmospheric pressure (101.325 kPa).
Note: Natural gas Zn / Zg = Fz2, Fz is called super compression factor, and it is calculated according to the formula in standard SY / T6143-1996.

Third, the main technical parameters and functions
3.1 Product execution standard
This flow meter implements the measurement technical specifications and standards of JB / T 7385-1994 "Gas Waist Flowmeter" and JJG633-2005 "Gas Volumetric Flowmeter Verification Regulations" and conforms to * standard GB3836.1-2010 "Sexual Environment No. 1 Part: General requirements for equipment "and GB3836.4-2010" Sexual environment Part 4: Equipment protected by essence ~ "i" "standards
3.2 Accuracy level:
Class 1.0: Qmax-0.2Qmax ± 1.0% 0.2 Qmax-Qmin ± 2.0%
Class 1.5: Qmax-0.2Qmax ± 1.5% 0.2 Qmax-Qmin ± 3.0%
The product is not specified, and it is shipped according to the 1.5 level accuracy. The remaining accuracy requires special instructions when ordering.
3.3 Flowmeter specifications, basic parameters and performance indicators (see Table 1)
(Table 1)


4.3.1 Flowmeter installation dimensions (see Table 3)

4.3.2 Flowmeter installation
1). Before installation and use, users should read this instruction in detail to ensure that the flowmeter is installed correctly and used reasonably, so as not to affect the normal operation and measurement accuracy.
2). Before and after installing the flowmeter, remove the inlet and outlet packages, and prevent particulate impurities from falling into the measurement room. If the surface of the measurement room is coated with anti-rust oil,

It can be washed clean with gasoline or kerosene and strictly ~ impurities in the pipeline. A filter or screen should be installed upstream of the flowmeter to prevent rust,

Welding slag and other impurities enter the measuring room.
4). When the flowmeter is installed, whether the inlet and outlet are vertical or horizontal position, the rotor axis should be kept as horizontal as possible.
5) .To prevent rust, welding slag and other impurities in the newly installed pipeline from entering the flowmeter, the user should first install the transition pipe in the flowmeter installation.

In position, ventilate for a period of time to ensure that there are no large particles of impurities, and then change the meter.
6). When installing the flowmeter, make sure that the center of the flowmeter is aligned with the center of the pipeline without misalignment and that the flowmeter is not affected by external forces (including the shaft

Tangential and tangential).

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