ATWU Gas Ultrasonic Flow Meter from China Manufacturer - Aister Instrument (Shanghai) Co., Ltd

Introduction Features Specifications Model Selection Application Installation

Introduction

The ATWU series gas ultrasonic flowmeter is based on the principle of ultrasonic time difference method. It is equipped with independent digital temperature transmitters and pressure transmitters, and integrates a wireless remote transmission module. It is a velocity-type gas metering instrument that integrates flow measurement, volume correction and remote data transmission. It features high measurement accuracy, good equipment reliability, low pressure loss and wide measurement range. It can meet the high-precision measurement requirements of the urban natural gas metering industry and can be widely applied in the gas flow measurement of trade handover fields in urban gas, chemical, power, metallurgy and other industries.

This type of product, with no movable parts and a self-diagnostic function, can help reduce the workload of engineering and maintenance for gas operators, lower the supply and sales gap, and enhance the level of lean management. The online monitoring system equipped at the same time can achieve comprehensive data collection and diagnostic analysis of the equipment. It can also set parameters of the equipment according to the authority, and the operation is simple.

Features

1.The unique multi-channel (two-channel or three-channel) oblique reflection design effectively deals with vortices and asymmetric flows

2. The accuracy grade is high, up to 1.0

3. The measurement range is wide, and the effective range ratio can reach up to 1:160

4. The cut-off flow rate is low, and the cut-off flow rate qt can be as low as 10qmin

5. The starting flow rate is low, as low as 0.2 m ³ /h for DN50

6. The pressure loss is small, with a pressure drop as low as 0.40kPa for DN50

7. Integrated temperature and pressure detection, and integrated temperature and pressure correction

8. The temperature and pressure transmitters are built-in to prevent accidental damage

9. Optional power supply: Lithium battery pack power supply or external power supply

010

10. Intrinsically safe equipment is easy to install on site and safe to use

Specifications

Performance	Technical parameter
Product model	ATWU
Measurement principle	Ultrasonic time difference method
Number of channels	Dual-channel (DN25/32/40/50/80/100), triple-channel (DN150/200)
Accuracy	Grade 1.0, Grade 1.5
Maximum allowable error	Grade 1.0	Grade 1.5
	qt≤q≤qmax：≤±1%； qmin≤q＜qt：≤±2%； qt=10qmin	qt≤q≤qmax：≤±1.5%； qmin≤q＜qt：≤±3%；qt=10qmin
Medium temperature	－30℃～＋60℃
Ambient temperature	－30℃～＋60℃
Pressure resistance grade	PN16
Explosion-proof grade	Ex ib IIB T4 Gb
Protection grade	IP65
Measured value	Working condition flow rate, cumulative working condition, standard condition flow rate, cumulative standard condition, temperature, pressure, etc
Measuring medium	Non-corrosive gases such as natural gas, air and nitrogen
Output signal	Calibration pulse: 0-3.2kHz (OD output, always on, external power supply effective) Low-frequency pulses: 0.1m³/p, 1m³/p, 10m³/p can be set (OD output, always on, always effective) Analog quantity: 1 channel 4 ~ 20mA (two-wire system, custom optional) Low power/valve closing alarm: OD output, always open, always effective
Communication interface	RS485, Bluetooth (optional) and wireless communication (NB or 4G)
Display mode	Liquid crystal display
Installation method	Flange connection (GB/T 9124.1-2019 standard)
Shell material	Cast aluminum
Power supply mode	It can be powered by an external power supply or an internal battery pack

Model Selection

01 Measure the medium, temperature, whether there is corrosion

02 Measuring range and pipe diameter range

03 Pressure rating

04 Working power supply

05 Signal output, communication

06 Whether to explosion-proof

07 Installation mode

08 Precision class

Application

Industrial process

Energy measurement

Environmental protection engineering

Transportation

Biotechnology

Scientific experiment

Marine meteorology

Rivers and lakes

Installation

Installation requirements
1. Install correctly according to the flow direction sign.
2. Built-in rectifier: The front end of the flowmeter should have a straight pipe of no less than 5D, and the rear end is recommended to have a straight pipe of 3D.
3. When installing, please ensure that the center axis of the flowmeter's measurement section coincides with the center axis of the straight pipe section.
When the air quality is relatively dirty, it is recommended to install a filter upstream of the flowmeter.

Notes
1. It is strictly prohibited to weld the flange of the flowmeter online.
flow
≥5D ≥3D 28
When conducting pressure tests on pipelines, it is important to ensure that the pressure does not exceed the upper limit of the range of the flowmeter and pressure transmitter.
3. It is recommended to add sun and rain protection when installing the flowmeter.
4. When not in use for a long time, it is recommended to close the valves on both sides to prevent gas backflow and flow fluctuation.
5. If there is a pressure reducing valve near the pipeline, appropriate noise reduction measures should be taken when necessary to prevent pressure reduction
The noise generated by the valve interferes with the flowmeter.
6. Flowmeters should be avoided from being installed on pipelines with mechanical vibration. If necessary, effective shock absorption measures should be taken
Measures should be taken to avoid any impact on measurement.

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