Gas turbine flowmeter

LWQ typeGas turbine flowmeterIt is a velocity type flow meter that accurately measures gas flow, with advantages such as simple and lightweight structure, high measurement accuracy, good repeatability, wide measurement range, and easy installation and maintenance. Widely used in the measurement of various gases such as natural gas, city gas, propane, butane, air, nitrogen and other gases in petroleum, chemical, metallurgical, aviation, scientific research and industrial fields. Due to its high precision and good repeatability, it is suitable for trade measurement and industrial process testing.

Gas turbine flowmeterWhen measuring online, the density of the medium changes with temperature and pressure. To achieve accurate measurement, it is necessary to simultaneously track and detect the temperature and pressure of the medium, and convert the volume flow rate under different operating conditions into the volume flow rate under standard or agreed conditions.

Due to the integration of temperature, pressure, and flow sensors, this type of flowmeter tracks and detects the temperature and pressure of the medium online, and performs automatic compensation and compression factor correction calculations. Therefore, it has excellent low-pressure and high-pressure measurement performance, and is particularly suitable for the precise measurement of various single-phase gases, such as natural gas. According to the different requirements of users, our company provides turbine flow meters with different precision levels.

⇒LWQ typeGas turbine flowmeterMain features:

1) High precision, good repeatability, low pressure loss, and good seismic performance;

2) Using high-quality bearings, with low friction resistance and good sealing performance, hand name;

3) Integrating microprocessors, flow sensors, high-precision temperature and pressure sensors, directly measuring the flow rate, temperature, and pressure of the measured gas, and automatically performing flow tracking compensation and compression factor correction calculations;

4) The instrument has pulse signal and analog signal output, and can directly achieve centralized data collection and real-time management of computer data through RS485 communication interface or GPRS system;

5) Low power consumption, can be powered by internal batteries or external power sources;

6) Equipped with real-time data storage function, it can prevent data loss during battery replacement or sudden power failure. In the event of a power outage, internal data can be saved;

7) Can be used in conjunction with IC card prepaid system for easy trade settlement;

8) Explosion proof products have explosion-proof markings ExibIIBT4 and ExibIIBT6.

⇒execution standard

GB/T 18940-2003 "Measurement of Gas Flow in Closed Pipelines - Turbine Flowmeters"

⇒Accuracy level:

Level 1.0: Qmax-0.2max ± 1.0% 0.2 Qmax-min ± 2.0%

Level 1.5: Qmax-0.2max ± 1.5% 0.2 Qmax-min ± 3.0%

Unless otherwise specified, the product is manufactured with a precision level of 1.5. For other accuracies, special instructions are required for customization when ordering.

⇒Flow meter model specifications and basic parameters (see table)1）

⇒LWQ typeGas turbine flowmeter Usage conditions:

♦Standard condition: P=101.325kPa T=293.15k

♦Usage conditions:

a. Environmental temperature: -25~+80 ℃ b. Medium temperature: -20~+60 ℃

c. Relative humidity: 5-95% d. Atmospheric pressure: 86kPa~106Kpa

♦Electrical performance indicators

1. Working power supply

a. Internal instrument power supply: 1 3.6VDC lithium battery, which can work normally when the battery voltage is between 3.1-3.6V;

b. Internal GPRS power supply: 1 6.6VDC lithium battery, which can work normally when the battery voltage is between 5.0-6.6V;

c. External power supply:+24VDC ± 15%, ripple ≤ ± 5%, suitable for 4-20mA output, pulse output, RS-485, etc;

d. External power supply (solar) GPRS power supply:+5VDC~+7VDC.

2. Power consumption of the whole machine: external power supply,<1W

Internal instrument power supply, with an average power consumption of ≤ 1mW, capable of continuous operation for more than five years.

Internal GPRS power supply: According to the daily average communication frequency (2-12 times), it can work continuously for one to five years.

3 pulse output mode

1) Base pulse signal: (used for instrument calibration):

Directly output the raw pulse signal detected by the flow sensor through an amplifier, with a high level ≥ 20V and a low level

≤1V。

2) Revised working condition pulse signal (or standard volume flow rate):

Set by software, the default output is the corrected working condition volume flow pulse, with an amplitude of: high level ≥ 20V, low level ≤ 1V.

3) Equivalent pulse signal (for IC card controller input):

a. TTL output amplitude 0-3V, output pulse width ≥ 50ms.

b. OC output.

4 Current output:

4-20mA standard analog current output function

Directly proportional to the standard volumetric flow rate, 4mA corresponds to 0 Nm3/h, and 20mA corresponds to the Z standard volumetric flow rate (this value can be set).

Output format: Two line system

5 RS485 通信

It can be connected to personal computers and PLCs through the internal RS485 standard interface for serial communication. It can display medium pressure, temperature, instantaneous flow rate, cumulative standard flow rate, battery voltage, etc.

⇒Flow meter selection

1. Scope of use

1) In situations where the flow range is required to be smaller than according to Table 1 and there are strict requirements for the initial flow rate.

2) There is no fluid medium with short interval time and large flow fluctuation amplitude

3) Suitable for natural gas, city gas, compressed air, nitrogen, etc

Determination of specifications

⇒Product Display

⇒Installation precautions

Dear user, hello! When installing and using this instrument, you should pay attention to the following:

♦Users should install a filter in front of the gas turbine flow sensor when installing it.

Note: Any damage to the impeller bearing caused by failure to install a filter is not covered by the warranty.

♦Before using the instrument, the pipeline should be cleaned in advance.

Note: Any damage to the impeller bearing caused by failure to clean the pipeline or incomplete pipeline cleaning is not covered by the warranty.

♦When installing a flowmeter, do not weld the pipeline after installation to avoid burning out the flowmeter core. If the flowmeter burns out the inner core due to welding pipeline, it is not covered by the warranty.

♦When using the instrument, the valve should be slowly opened until the pipeline is filled with gas, and then the large valve should be opened to prevent damage to the impeller.

♦If it is a temperature and pressure compensation type, the pressure sensor valve on the instrument should be opened first.

♦When installing sensors, the straight pipe section in front of the instrument should not be less than 20 times the DN, and the straight pipe section behind the instrument should not be less than 10 times the DN.

All products come with a 2-year warranty;

Negotiate on-site guidance for installation, debugging, and other matters, and only charge reasonable travel expenses;

Service tenet: No matter how long the product is used, as long as you find us, we will solve all problems for you until you are satisfied. We believe that our more than 10 years of practical experience in the flowmeter industry can provide you with satisfactory services.

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