ATCF Coriolis Mass Flow Meter from China Manufacturer - Aister Instrument (Shanghai) Co., Ltd

Introduction

The two ends of a bent pipe are fixed, and the pipe is subjected to vibration force (according to the resonance frequency of the pipe) at the middle of the two fixed points, so that it vibrates at its natural frequency ω with the fixed point as the axis. When there is no fluid flow in the pipeline, the pipeline is only affected by the external vibration force, and the vibration direction of the two half sections of the pipeline is the same without phase difference. When there is a fluid flow, affected by the Coriolis force Fc flowing in the pipeline (Coriolis force F1 and F2 in the two half sections of the pipeline are equal in size and opposite in direction), the two half sections of the pipeline are twisted in the opposite direction, resulting in a phase difference, which is proportional to the mass flow. The design of the sensor is to convert the measurement of Coriolis force into the measurement of the phase difference on both sides of the vibration tube, which is the working principle of Coriolis principle mass flowmeter.

Features

01

Easy installation and use: no straight pipe section requirements, no rectification device, no moving parts, simple maintenance, high range ratio.

02

Direct measurement of medium variables: medium mass flow rate: proportional to the phase difference of the vibration of the measurement tube.Medium density: proportional to the vibration frequency of the measuring tube. Medium temperature: temperature sensor measurement.

03

Indirect measurement of other variables of the medium: medium volume flow, medium concentration and other variables.

04

It has high measurement accuracy, standard accuracy 0.2%; And the measurement is not affected by the physical properties of the medium.

05

There is no moving parts to wear and need to be replaced. These design features reduce the need for routine maintenance.

06

The Coriolis mass flow meter is insensitive to viscosity, temperature and pressure.

07

The Coriolis flow meter can be configured to measure positive or reverse flow.

08

Flow meters are operated by flow characteristics such as turbulence and flow distribution. Therefore, upstream and downstream direct pipe operating requirements and flow regulation requirements are not required.

09

The Coriolis flow meter does not have any internal obstacles, which may be damaged or blocked by viscous slurry or other types of particulate matter in the flow.

010

It can take measurement of high viscosity fluids, such as crude oil, heavy oil, residual oil and other liquids with higher viscosity.

Specifications

Performance	Technical parameter
Flow accuracy	±0.2% Optional ±0.1%
Diameter	DN3~DN200mm
Flow repeatability	±0.1~0.2%
Density measuring	0.3~3.000g/cm3
Density accuracy	±0.002g/cm3
Temperature measuring range	-200~300ºC (Standard Model -50~200ºC)
Temperature accuracy	+/-1ºC
Output of current loop	4~20mA; Optional signal of flow rate/Density/Temperature
Output of frequency/pulse	0~10000HZ; Flow signal (Open collector)
Communication	RS485, MODBUS protocol
Power supply of transmitter	18~36VDC power≤7W or 85~265VDC power 10W
Protection class	IP67
Material	Measuring tube SS316L housing:SS304
Pressure rating	4.0Mpa (Standard pressure)
Explosion-proof	Exd(ia) IIC T6Gb
Enviroment Specifications
Ambient temperature	-20~-60ºC
Enviroment humidity	≤90%RH

Model Selection

01 Safety of media:
The corrosiveness of the medium, whether the medium has a chemical reaction with the liquid surface material of the flow meter, and whether the instrument housing has a certain corrosion resistance to the application site.

02 Pipeline pressure:
The pressure level of the sensor should meet or be higher than the pressure level of the process pipeline design, and the sensor should not be used in the overpressure range.

03 Temperature of the medium:
When selecting the instrument, attention should be paid to the applicable temperature of the instrument, and the temperature resistance of the detection element in the sensor is certain, so as to avoid the normal use of the instrument caused by the damage of the detection device.

04 protection requirements:
Consider whether the protection level of the instrument housing meets the requirements for use when using the instrument outdoors and in special occasions.

05 explosion-proof requirements:
The explosion-proof level of the instrument should meet the safety standards of the use site, distinguish the safety side and the dangerous side of the explosion-proof site, and reasonably select the required explosion-proof type of sensors and transmitters.

06 Flow range:
First of all, the measuring range of the flowmeter should cover the flow range of the measured medium; Secondly, the measurement accuracy of the mass flow meter contains zero instability, which affects the accuracy of the measurement at the lower limit (small flow rate), so the flow range of the measured medium is best selected in the best flow range of the flow meter (20%-85% of the maximum flow rate of the flow meter).

07 other relevant factors: including instrument installation, maintenance, power and pressure loss and other factors.

Application

Industrial process

Energy measurement

Environmental protection engineering

Transportation

Biotechnology

Scientific experiment

Marine meteorology

Rivers and lakes

Installation

① The installation position should avoid electromagnetic interference. The installation positions of sensors and transmitters and cable laying should be far away from devices prone to strong electromagnetic fields, such as high-power motors, transformers, and frequency conversion devices.

② The process pipe should be in the middle, and both sides of the flange should be parallel. It is strictly prohibited to use the sensor to straighten the upper and downstream process pipes, otherwise it will affect the measurement and even damage the sensor. In addition, there should be stable support at the near flange of the process pipeline on both sides (about 2 to 10 times the pipe diameter).

③ The butterfly valve cannot be installed on the inlet side of the sensor.

④ On the upper and downstream pipes of the sensor, it is recommended to install a stop valve and bypass to facilitate zero calibration, daily maintenance and to ensure that the sensor can also be in a full pipe state when not working. Flow control using the regulator downstream of the sensor.

⑤ When measuring the easy vaporizing medium, it is recommended to install a pressure gauge downstream of the flow meter to check the downstream pressure; If the downstream of the flow meter is to expand the diameter, it is recommended that the downstream process tube of the flow meter be kept at the same diameter distance from the flow meter, and it is recommended that the downstream valve of the sensor be installed to adjust the appropriate back pressure to prevent the occurrence of vaporization or cavitation. If the medium vaporizes or cavitation occurs in the flow meter, the measurement accuracy will be affected, and the sensor will not work normally in serious cases.

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